Horizon Hobby Apprentice STS E-flite User manual

Instruction Manual
Bedienungsanleitung
Manuel d’utilisation
Manuale di Istruzioni
SAFE®Select Technology, Optional Flight Envelope Protection

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Apprentice STS
2
Safety Precautions and Warnings
AGE RECOMMENDATION: Not for children under 14 years. This is not a toy.
As the user of this product, you are solely responsible for operating in a manner that does not endanger yourself and others or result in damage to the product or the property of others.
• Always keep a safe distance in all directions around your model
to avoid collisions or injury. This model is controlled by a radio
signal subject to interference from many sources outside your
control. Interference can cause momentary loss of control.
• Always operate your model in open spaces away
from full-size vehicles, traffic and people.
• Always carefully follow the directions and warnings for this and any
optional support equipment (chargers, rechargeable battery packs, etc.).
• Always keep all chemicals, small parts and anything
electrical out of the reach of children.
• Always avoid water exposure to all equipment not specifically designed
and protected for this purpose. Moisture causes damage to electronics.
• Never place any portion of the model in your mouth as
it could cause serious injury or even death.
• Never operate your model with low transmitter batteries.
• Always keep aircraft in sight and under control.
• Always use fully charged batteries.
• Always keep transmitter powered on while aircraft is powered.
• Always remove batteries before disassembly.
• Always keep moving parts clean.
• Always keep parts dry.
• Always let parts cool after use before touching.
• Always remove batteries after use.
• Always ensure failsafe is properly set before flying.
• Never operate aircraft with damaged wiring.
• Never touch moving parts.
NOTICE
All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, LLC. For up-to-date product literature, visit
www.horizonhobby.com or towerhobbies.com and click on the support or resources tab for this product.
MEANING OF SPECIAL LANGUAGE:
The following terms are used throughout the product literature to indicate various levels of potential harm when operating this product:
WARNING: Procedures, which if not properly followed, create the probability of property damage, collateral damage, and serious injury OR create a high probability of
superficial injury.
CAUTION: Procedures, which if not properly followed, create the probability of physical property damage AND a possibility of serious injury.
NOTICE: Procedures, which if not properly followed, create a possibility of physical property damage AND little or no possibility of injury.
WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can
result in damage to the product, personal property and cause serious injury.
This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this Product
in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without direct adult
supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. This manual contains
instructions for safety, operation and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in
order to operate correctly and avoid damage or serious injury.
14+
WARNING AGAINST COUNTERFEIT PRODUCTS: If you ever need to replace your Spektrum receiver found in a Horizon Hobby product, always purchase from
Horizon Hobby, LLC or a Horizon Hobby authorized dealer to ensure authentic high-quality Spektrum product. Horizon Hobby, LLC disclaims all support and
warranty with regards, but not limited to, compatibility and performance of counterfeit products or products claiming compatibility with DSM or Spektrum technology.

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3
Table of ContentsSpecifications
If you own this product, you may be required to register with the FAA. For up-to-
date information on how to register with the FAA, please visit
https://registermyuas.faa.gov/. For additional assistance on regulations and
guidance on UAS usage, visit knowbeforeyoufly.org/.
From the box to the air (No LAS or GPS Module).....................................................4
Charger Warnings ..................................................................................................4
Charge the Flight Battery .......................................................................................5
Transmitter ............................................................................................................6
Transmitter Setup (BNF).........................................................................................7
Dual Rates.............................................................................................................7
Assemble the Aircraft.............................................................................................8
Transmitter and Receiver Binding.........................................................................10
Flight Battery Installation, SAFE system and Electronic
Speed Control (ESC) Arming.................................................................................11
Center of Gravity (CG) ..........................................................................................11
Control Direction Test...........................................................................................12
Choose a Flying Field...........................................................................................12
Range Test...........................................................................................................13
Install the Propeller..............................................................................................14
Flying ..................................................................................................................15
Landing ...............................................................................................................20
Water Takeoff and Landing Using the Optional Float Set.......................................20
Post Flight............................................................................................................20
Factory settings for the Control Horns and Servo Arms.........................................21
AS3X®System Trouble Shooting Guide (without GPS)...........................................22
Troubleshooting Guide (without GPS)....................................................................22
Optional Landing Assist Sensor (LAS) Upgrade.....................................................23
Optional SAFE+GPS Upgrade ..............................................................................24
LED Indications....................................................................................................32
Service and Repairs.............................................................................................33
Replacement Parts...............................................................................................34
Recommended Parts............................................................................................34
Optional Parts......................................................................................................34
AMA National Model Aircraft Safety Code.............................................................35
Limited Warranty .................................................................................................36
Warranty and Service Contact Information ...........................................................36
FCC Information...................................................................................................37
IC Information......................................................................................................37
Compliance Information for the European Union...................................................37
Box Contents
Motor: 840Kv Brushless Outrunner (EFLM7450) Included Included
ESC: 30-Amp Smart ESC; Apprentice STS (EFLA1030FB) Installed Installed
Servos: (4) 37g Standard Servo (EFLR7150)
(2) 13g Digital MG Micro Servo (EFLR7155) Installed Installed
Receiver: Spektrum™DSMX SRXL2™Receiver w/
Connector Installed (SPM4650C) Installed Installed
Recommended Battery: 3200mAh 11.1V 3S Smart
IC3™30C Li-Po (SPMX32003S30) Included Required
Recommended Battery Charger:
3-cell Li-Po battery balancing charger Included Required
Recommended Transmitter:
Full-Range 2.4GHz with Spektrum™DSM2®/DSMX®
technology with programmable mixing and adjustable dual
rates
Included Required to
Complete
49.0 oz
(1390 g)
42.5 inches (1080mm)
59.0 inches (1500mm)
515 in²
(33.2 dm²)
RECEIVER BIND INFORMATION
Channels 6
Frequency 2404 – 2476 MHz
Compatibility DSM2 and DSMX

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Apprentice STS
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CAUTION: All instructions and warnings must be followed exactly.
Mishandling of Li-Po batteries can result in a fire, personal injury, and/or
property damage.
• NEVER LEAVE CHARGING BATTERIES UNATTENDED.
• NEVER CHARGE BATTERIES OVERNIGHT.
• By handling, charging or using the included Li-Po battery, you
assume all risks associated with lithium batteries.
• If at any time the battery begins to balloon or swell, discontinue use
immediately. If charging or discharging, discontinue and disconnect.
Continuing to use, charge or discharge a battery that is ballooning or
swelling can result in fire.
• Always store the battery at room temperature in a dry area for best results.
• Always transport or temporarily store the battery in a temperature range of
40–120º F (5–49º C). Do not store battery or aircraft in a car or direct sunlight.
If stored in a hot car, the battery can be damaged or even catch fire.
• Always charge batteries away from flammable materials.
• Always inspect the battery before charging and
never charge dead or damaged batteries.
• Always disconnect the battery after charging, and
let the charger cool between charges.
• Always constantly monitor the temperature of the battery pack while charging.
• ONLY USE A CHARGER SPECIFICALLY DESIGNED TO CHARGE LI-PO
BATTERIES. Failure to charge the battery with a compatible charger
may cause fire resulting in personal injury and/or property damage.
• Never discharge Li-Po cells to below 3V under load.
• Never cover warning labels with hook and loop strips.
• Never charge batteries outside recommended levels.
• Never attempt to dismantle or alter the charger.
• Never allow minors under the age of 14 to charge battery packs.
• Never charge batteries in extremely hot or cold places (recommended
between 40–120° F or 5–49° C) or place in direct sunlight.
Charger Warnings
From the box to the air (No LAS or GPS Module)

1. Remove and inspect contents.
2. Read this instruction manual thoroughly.
3. Charge the flight battery.
4. Fully assemble the aircraft
5. Make sure all linkages move freely.
6. Install a fully charged flight battery in the aircraft.
7. Check the Center of Gravity (CG).
8. Set up your transmitter (BNF only)
9. Bind the aircraft to your transmitter (BNF only)
10.Place the aircraft into Experienced Mode (Mode switch position 2) for
the Control Direction Test. Place the aircraft on the ground facing away
from you.

11.Perform the control direction test with the transmitter
12.Adjust the flight controls and transmitter as needed.
13.Place the aircraft into Beginner Mode (Mode switch position 0) for the
SAFE Control Direction Test and takeoff.
14.Perform SAFE Control Direction Test
15.Find a safe open area to fly.
16.Perform a radio system range test.
17.Plan flight for flying field conditions.
18.Set flight time for 10 minutes.
Optional Upgrades (not included)
Landing Assist Sensor (LAS) GPS Module
When added, the LAS module will work hand-in-hand with the AutoLand feature
for a picture perfect landing every time. When the aircraft is on approach and
approximately 1m from the ground, the LAS module will level out the aircraft, adjust
throttle if needed, and then flare the aircraft just before touchdown.
When added, advanced SAFE+ features can keep the aircraft within a given distance
to the pilot (Virtual Fence), can return the model to home at the press of a button
(Holding Pattern), can return home automatically if the controller signal is lost
(Failsafe), and can land itself when commanded (AutoLand).

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5
A
B
The recommended battery for the E-flite Apprentice STS aircraft, included with the
RTF version, is an 11.1V, 3200mAh 3S 30C Smart Technology LiPo battery with an
IC3™connector (SPMX32003S30). If using a different battery, the battery should be of
similar capacity, dimensions and weight to fit in the fuselage. The aircraft electronic
speed control is equipped with an IC3 device connector. Ensure the battery chosen
is compatible. Always ensure the model balances at the recommended center of
gravity (CG) with the chosen battery. Follow your chosen battery and battery charger
instructions to charge the flight battery.
RTF Smart Technology Battery and S120 Charger,
Specifications and Operation
The Spektrum S120 SMART Technology battery charger included with the RTF
version of the aircraft is compatible only with Spektrum SMART 2-3 cell LiPo
batteries or 6-7 cell NiMH batteries. It is not compaptible with any other battery
chemistries or non-SMART batteries.
A USB power supply is required for use. A USB-C QC type power supply is
recommended for the fastest charge times.
To charge the included flight battery:
1. Using the supplied Type-C USB cable, connect the S120 charger to a USB
power supply (not included ).
2. Insert the Spektrum SMART
Battery IC3 connector (A)
into the charger IC3 port, and
insert the battery balance
lead (B) into the charger
balance port. Both the IC3 and
balance connectors must be
connected for the charging
process to begin. The battery
may be disconnected from the
charger at any time
to stop the charging process.
IMPORTANT: SMART NiMH batteries do not have a balance connector.
3. Disconnect the IC3 and balance connectors when the charge and balance
cycles are complete, as indicated by the LED.
4. The LED indicator will glow solid red to indicate a charging error. Follow the
operation steps to ensure proper connection is used to charge the battery.
Refer to the LED indicator table for charger status.
IMPORTANT: Connecting a non-SMART battery will cause a charge error and the
S120 will not recognize or charge the battery.
S120 Specifications
Input USB Type C, power supply not included
Input Voltage 5V-12V
Charge Power 18W max (dependant on power supply)
Compatible USB Power Adaptor 5V/1A, 5V/2A, USB Quick Charge (QC) 2.0/3.0
Battery Connector IC3™and balance connector
Battery Types LiPo, NiMH (Spektrum SMART Batteries only)
Cell Count 2-3 cell LiPo, 6-7 cell NiMH
Max Output Voltage 13.05V
Max Output Current Up to 2A
LED Indicator
Power On USB 5V: White LED
USB Quick Charge 2.0/3.0: Blue LED
LiPo: Purple LED
NiMH: Yellow LED
Battery Capacity
Less Than 25% Single Flash
25% – 75% Double Flash
76% – 99% Triple Flash
Charge Complete Green LED (Solid)
Error Red LED (Solid)
USB-C port LED Indicator
Balance Port
IC3 Charge Port
Charge the Flight Battery

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Apprentice STS
6
Transmitter
Installing the Transmitter Batteries
Your Spektrum DXe Transmitter comes prebound to the aircraft.
Remove the battery cover, install the four included batteries (noting proper polarity)
and reinstall the battery cover.
Low Battery Alarm
When the transmitter battery voltage drops below 4.7 volts, an alarm sounds and
the voltage LEDs flash. The batteries must be replaced immediately. If this happens
while flying, land your aircraft as soon and as safely as possible.
CAUTION: If using rechargeable batteries, charge only rechargeable
batteries. Charging non-rechargeable batteries may cause the batteries to
burst, resulting in injury to persons and/or damage to property.
Transmitter Features B
D
KEY
AAntenna
BTrainer/Bind/Panic Button
C(CH 5) SAFE Flight Mode
DPower ON LED
ELeft Control Stick
FTrim button (for Up-down on stick)
GTrim button (for Left-right on stick)
HPower Switch (ON/OFF)
INeck Strap Mount
JHi/Lo (Dual Rate) Switch
KRight Control Stick
LTrim button (for Up-down on stick)
MTrim button (for Left-right on stick)
NThrottle Cut
OHandle
PTrainer Port
QBattery Cover
Mode 2
A
C
E
G
F
I
H
J
K
L
M
P
Q
O
N
Explanation of DXe Transmitter LEDs, Switches and Modes for the Apprentice.
Trainer/Bind/Panic Switch (B):
This switch is used as both the trainer and bind switch as well as the Panic
Switch for your Apprentice STS. For complete binding instructions, refer to the
binding section below.When using the trainer function, connect the trainer cord
(SPM6805) into the trainer port in both the master (instructor) and the slave (student)
transmitters. The master transmitter must be powered ON and bound to the receiver.
The slave transmitter must be powered OFF. Any time you press and hold the trainer
button on the master, it will give control authority to the slave. Releasing the trainer
button returns control to the master.
IMPORTANT: The slave transmitter must always have the same settings as the
master. See Flight Training section for setup of other Spektrum Transmitters.
Hi/Lo Rate Switch (J ):
This switch supports high and low rate functions on aileron, elevator and rudder
channels. In the upper, or “HI” position, servo travel is 100% on these channels. In the
lower, or “LO,” position, servo travel decreases to 70%. This switch lets you quickly
change control rates from high for aggressive maneuvers to low for smooth, precise
maneuvers. When learning to fly, use low rate.
Channel 5 Switch (C):
This switch is used to select the SAFE Flight mode. For other conventional receivers,
this switch controls a servo connected to the Channel 5/Gear port.
LEDs (D) show:
Flashing with beeps Bind mode when Trainer (Bind) switch is held and the
transmitter is powered on (see Binding instructions).
Pulsates with one low tone beep every 2 seconds (when transmitter battery
voltage drops below 4.7 volts). Replace the batteries immediately. If this happens
while flying, land your aircraft as soon and as safely as possible.

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7
Computerized Transmitter Setup
(DX6 Gen2, DX6e,DX7 Gen2, DX8 Gen2, DX9, iX12, DX18 and DX20)
Start all transmitter programming with a blank model
(do a model reset), then name the model.
Set Aileron, Elevator, and
Rudder Rates to:
HIGH 100%
LOW 70%
DX6
DX6e
DX8
DX9
iX12
DX20
Go to the SYSTEM SETUP
Set MODEL TYPE: AIRPLANE
Go to CHANNEL ASSIGN:
click NEXT to go to Channel Input Config:
GEAR: B, AUX1: I
Go to the FUNCTION LIST
Go to Throttle Cut:
set to Switch H, Position: –100
Resulting in:
Switch H operates Throttle Cut, position 0 is normal
and position 1 cuts power to the throttle.
Switch B operates the 3 SAFE modes
(0 beginner/1 intermediate/2 experienced).
Button I operates PANIC mode.
If using any DSMX transmitter other than the included DXe (3 position gear switch,
RTF only) the radio will have to be configured correctly for the SAFE system to work
properly.
• SAFE Flight mode is selected using Channel 5 signal (high, middle, low)
• Panic mode is selected with Channel 6 signal (high, low)
Refer to your transmitter’s manual for more information about transmitter setup.
If using a 2 position switch for SAFE flight modes, only Beginner and Experienced
modes will be active.
Any DXe Transmitter that was not included with a EFL Apprentice STS RTF will
need to be programmed using the Spektrum Programmer (SPMA3065) to function
correctly with this aircraft. Visit www.spektrumrc.com to download the correct
program for this aircraft.
BNF Transmitter Telemetry Setup
If the transmitter that you intend to use with this aircraft is not displaying telemetry
data, visit Spektrumrc.com and update your firmware. With the latest firmware
installed on your transmitter the telemetry option should now be functional on your
transmitter.
Dual Rate High Rate Low Rate
Aileron 100% 70%
Elevator 100% 70%
Rudder 100% 70%
The included DSMX®full range transmitter features dual rates to allow you to
select the amount of travel that you want from the control surfaces.
WARNING: Before proceeding further, remove the propeller and spinner from the motor shaft. Never attempt
to program the radio components, assemble the aircraft or perform maintenance of any kind without
removing the propeller or engaging throttle cut. Serious injury could result if the motor starts inadvertently with the
propeller still attached.
B
A
CD
E
F
1. Remove the spinner (A) from the
backplate (B), by pinching the
backplate and pulling the spinner
away.
2. Remove the hex nut (C), washer (D)
and propeller (E) from the collet (F).
A 10mm wrench may be required to
remove the hex nut.
Transmitter Setup (BNF)
Dual Rates

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Apprentice STS
8
Assemble the Aircraft
Landing Gear Installation
1. Turn the model so you can see the bottom of the fuselage.
2. Insert a screwdriver through the hole on the underside of the cowl to loosen the
screw (A) in the nose gear steering arm.
3. Remove the plug screw (B) from the nose gear steering arm hole and insert the
nose gear (C) (flat spot facing to the front) fully in the mount (D).
4. Fully tighten the screw onto the flat spot of the strut.
5. Push together the main landing gear struts (E) and insert the top loop into the
slot in the fuselage as shown.
6. Disassemble in reverse order.
A
D
C
E
Tail Installation
1. Press fit the 2 pins (A) of the vertical stabilizer (B) throght the holes of
horizontal stabilizer (C).
2. Install the tail assembly on the fuselage under the linkages as shown.
3. Carefully align the 2 pins of the tail assembly with the fuselage holes and press
fit the assembly into place.
4. Under the fuselage, use 2 screws (D) to secure the tail assembly to the
fuselage. Tighten the screws, but do not break the plastic.
5. Connect the respective clevises in the outermost holes in the rudder and
elevator control horns. Refer to the clevis adjustment instructions to center the
rudder and elevators.
6. Disassemble in reverse order.
A
D
B
C
B

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9
Wing Installation
1. Carefully apply the 2 strips of double-stick tape (A) to the root of the wing as
shown. Assemble the wings on the carbon wing tube (B) so there is no gap. No
epoxy is required to hold the wings together; however, if desired, epoxy may be
used (instead of the tape) to adhere the wings to each other on the wing tube.
2. Ensure the wings are correctly aligned. Using double stick tape, install the front
(C) and rear (D) wing covers in their respective slots on the wing as shown.
3. Connect the right and left aileron servo arms to the respective control horns by
using the included linkages and clevises in the outermost holes. Refer to the
clevis adjustment instructions to center the ailerons.
4. Connect the left aileron servo connector to the servo extension labeled “AIL-L”,
and connect the right aileron servo connecter to the servo extension labeled
“AIL-R”.
5. Install the wing on the fuselage.
CAUTION: DO NOT crush or otherwise damage the wiring when attaching
the wing to the fuselage.
6. Install 8 rubber bands (F) on the front and back rods to complete the
installation. Center the wing on the fuselage. Going from front to back over the
wing, attached 8 rubber bands to secure the wing to the fuselage.
7. Disassemble in reverse order.
IMPORTANT: The rubber bands reduce wing damage from impact. Always replace
worn or broken rubber bands.
We recommend removing the wing from the fuselage for transport and storage of
your model. Before each flight, ensure the wing is centered, straight and secure on
the fuselage.
TIP: Ensure the caps are secure on the ends of the rods. If needed, apply CA
(cyanoacrylate adhesive) to secure a cap on the rod.
E
F
B
A
D
C
R-AIL L-AIL

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Apprentice STS
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Transmitter and Receiver Binding
Binding is the process of programming the control unit to recognize the GUID
(Globally Unique Identifier) code of a single specific transmitter.
The aircraft should be bound to the transmitter at the factory, but if you need to
re-bind them, follow these steps. If your aircraft does not respond to the transmitter
when the batteries in the aircraft and transmitter are fully charged, your aircraft
and transmitter may need to be re-bound using the instructions below.
Please refer to the optional parts list in this manual or visit www.bindnfly.com for a
list of compatible transmitters. For the BNF aircraft, you need to ‘bind’ your chosen
Spektrum™ DSMX®technology equipped aircraft transmitter to the receiver for
proper operation.
IMPORTANT: The throttle will not arm if the transmitter’s throttle control is not put
at the lowest position. If you encounter problems, follow the binding instructions
and refer to the transmitter troubleshooting guide for other instructions. If needed,
contact the appropriate Horizon Product Support office.
Binding Procedure (without GPS Module)
1. Make sure the transmitter is
powered off.
2. Make sure the transmitter controls
are neutral, the throttle is in the
low position, and the aircraft is
immobile.
3. Connect the flight battery in the
aircraft, then power on the ESC
switch. The Flight Controller LED will
begin to flash red and blue.
4. On the remote Spektrum receiver
that is connected to the flight
controller, press and release the
bind button. The receiver LED will
flash rapidly.
5. Press and hold the trainer button
on the top of the transmitter while
turning on the power switch.
6. When the receiver binds to the
transmitter, the receiver LED will
be solid on. Flight controller LED in
windshield will also be green when
in beginner mode. (without LAS or
GPS installed)
Once bound the receiver and transmitter
should retain their bind for future flights.
IMPORTANT: IF THE OPTIONAL GPS MODULE IS INSTALLED the aircraft will not respond to transmitter commands after binding if it cannot acquire a GPS
signal.
Binding: After binding with the GPS module installed, the aircraft will search for a GPS lock, indicated by the elevator slowly cycling up and down. After
acquiring a GPS lock, all flight controls will respond normally except throttle. The throttle will be limited, allowing the aircraft to be taxied out to takeoff
position on the runway. Set the home position to regain full functioning throttle. See the Powering On With GPS section of this manual for further details.
Compass calibration: After binding the first time with the GPS module installed in the aircraft, compass calibration is required. The aircraft will automatically
enter the compass calibration sequence after installing the GPS for the first time. This is indicated by the ailerons slowly cycling up and down. The aircraft will
not respond to transmitter commands with the GPS module installed until calibration has been completed. See the Compass Calibration section of this manual
for further details.
Subsequent binding with the GPS module will not require compass calibration.
Applies only when the optional GPS module is installed

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11
Flight Battery Installation, SAFE system and Electronic Speed Control (ESC) Arming
1. Rest the aircraft on a flat surface with the landing gear facing up and make
sure the switch is OFF.
2. Turn the latch (A) and open the battery hatch.
3. Lower the throttle and turn on the throttle hold switch, then power on the
transmitter for at least 5 seconds.
4. Connect the flight battery to the aircraft.
5. Secure the flight battery (B) in the battery compartment using the hook and
loop straps (C) so that the aircraft has a balanced Center of Gravity (CG).
TIP: Connect the battery to the flight controller plug before securing the battery.
Tuck the battery wires through the opening in the battery compartment. Then
secure the battery with the hook and loop straps.
Important: Before flying, refer to the “Verifying Your Aircraft’s Center of Gravity
(CG)” section for details about final battery placement.
6. Close the battery hatch and turn the latch to secure the hatch shut.
7. Put the aircraft on its landing gear, then power ON the Switch (D). The aircraft
should be on level ground and must be kept immobile while the SAFE system
initializes. If the aircraft does not initialize after about 30 seconds because of
too much movement, power OFF the ESC Switch and power it on again to re-
initialize the system.
After the SAFE system initializes, the rudder will move back and forth, then come
to neutral to indicate the SAFE system has initialized and is ready to operate. If you
accidentally connect the battery while the throttle is not a its lowest position, the
ESC will not arm the motor. Reduce throttle to lowest setting for motor to arm.
IMPORTANT: SAFE technology is not active until you advance the throttle past 25%.
Once it is active, the control surfaces may move on the aircraft. This is normal. The
SAFE technology will remain active until the ESC is turned off.
CAUTION: Always disconnect the Li-Po flight battery from the aircraft
receiver when not flying to avoid over-discharging the battery. Batteries
discharged to a voltage lower than the lowest approved voltage may become
damaged, resulting in loss of performance and potential fire when batteries are
charged.
CAUTION: Always keep hands away from the propeller. When armed, the
motor will turn the propeller in response to any throttle movement.
Mode 2 Mode 1
Keep immobile and
out of the wind for
5 seconds
A
B
D
C
Center of Gravity (CG)
An aircraft with a correct CG has its weight balanced at a calculated point where
the entire airframe will balance when suspended at that point. After installing the
battery (in the recommended position) and before powering on the ESC switch,
verify the CG by supporting the aircraft 79.0mm (approximately 3.125 inches) back
from the front edge of the wing, as shown.
Balance the aircraft on your fingertips near the fuselage under the wings.
• If the nose goes down, move the flight battery back until the aircraft balances.
• If the nose goes up, move the flight battery forward until the aircraft balances.
When flying with correct CG in beginner mode, the aircraft should climb gradually
at full power and fly level at 50%–60% power with no elevator input. If the aircraft
CG is too far forward (nose heavy), up elevator is required to fly level at 50%–60%
power. If the aircraft CG is too far aft (tail heavy), down elevator is required to fly
level. Adjust the battery position as needed.
79.0mm
3.125 inches back from the
leading edge of the wing.

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Apprentice STS
12
Control Direction Test
Choose a Flying Field
Consult local laws and ordinances before choosing a location to fly your aircraft.
In order to have the most success and to protect your property and aircraft, it is
very important to select a place to fly that is very open.
Remember, your aircraft can reach significant speeds when flying and can cover
ground quickly. Plan on flying in an area that gives you more space than you think
you need, especially with first flights.
The flying site should:
• Have a minimum of approximately 1300 feet
(400m) of clear space in all directions.
• Be clear of people and pets.
• Be free of trees, buildings, cars, power lines or anything that could
entangle your aircraft or interfere with your line of sight.
WARNING: Do not perform this or any other equipment test with the
propeller installed on the aircraft. Serious injury or property damage
could result from the motor starting inadvertently.
1. Set the flight mode switch to Experienced mode (position 2).
2. Keep the throttle at zero and place the model on level ground away from
obstacles.
3. Move the sticks on the transmitter as described in the table to ensure the
aircraft control surfaces respond as shown.
If the control surfaces do not respond as shown, DO NOT FLY. Refer to the
Troubleshooting Guide for more information. If you need more assistance,
contact the appropriate Horizon Hobby Product Support department.
If the aircraft responds as shown, continue on to the Flight Control section.
Transmitter
command Control Surface Response
ElevatorAileronRudder

EN
13
Range Test
HOLD
4X
WARNING: Do not perform this or any other equipment test with the
propeller installed on the aircraft. Serious injury or property damage could
result from the motor starting inadvertently.
WARNING: While holding the aircraft during the range test, always keep
body parts and loose items away from the motor. Failure to do so could
cause personal injury.
Before each flying session, and especially with a new model, you should perform
a range check. If you have the BNF aircraft, refer to your transmitter manual to
perform a range check of your system.
The RTF included DXe transmitter incorporates a range check mode to reduce the
output power of the transmitter. Follow the directions below to enter range check
mode for the DXe transmitter:
1. Power on the transmitter for 5 seconds or more with the throttle stick and trim
low. Plug in the aircraft battery and keep the aircraft immobile for 5seconds.
2. Face the model with the transmitter in your normal flying position.
3. Toggle (back and forth = 1 toggle) the HI/LO Rate switch rapidly 4 times and
then press and hold the bind button. The transmitter LEDs will flash and the
alarm will sound. The system is in range check mode. Do not let go of the bind
button until you are finished with the range check.
IMPORTANT: You must hold the BIND/Panic button during the entire range check
process. Releasing the button will exit the range check mode.
4. With the radio system powered on and the model restrained on the ground,
stand 28meters (90 feet) away from the model.
TIP: In some aircraft, when the model is placed on the ground, the antenna(s) can
be within inches of the ground. Close proximity of the antenna(s) to the ground
can reduce the effectiveness of the range check. If you experience issues during
the range check, restrain the model on a non-conductive stand or table up to 2ft
(60cm) above the ground, then range check the system again.
5. Move the transmitter rudder, elevator, aileron and throttle controls to ensure
they operate smoothly at 28 meters (90 feet).
6. If control issues exist, do not attempt to fly. Refer to the contact table at the
end of the this manual to contact Horizon Hobby product support. Also, see the
Spektrum website for more information.
7. When the range check is successfully completed, release the bind button to exit
range check mode.
CAUTION: Due to reduced output power of the transmitter, NEVER attempt
to fly while the transmitter is in range check mode. Loss of control will
occur.

EN
Apprentice STS
14
WARNING: Do not install the propeller until the aircraft has been
completely assembled, all the systems have been checked thoroughly
and you are located at a suitable flying site.
Follow the instructions below to install the propeller and spinner.
1. Install the propeller (E), backplate (B),washer (D), and hex nut (C) onto the
motor shaft.
2. Thighten the hex nut with a 10mm wrench to secure the propeller into place.
3. Push the spinner (A) onto the backplate until it clicks.
IMPORTANT: The motor shaft and prop nut are reverse-threaded. Turn the prop nut
counter-clockwise to tighten it to the motor shaft. B
A
CD
E
F
SMART Technology Electronic Speed Control (ESC)
The Apprentice STS is equipped with an exclusive Smart ESC that can provide a
variety of real-time power system related telemetry data including motor RPM,
current, battery voltage and more to compatible Spektrum AirWare™ equipped
transmitters (including the DX6e and 8e, DX6 and 8 G2, the DX9, iX12 and others)
while you fly.
Access the telemetry data by plugging the ESC into channel 6 on the A3230 Flight
Controller. The ESC will send the below information to the flight control and the
information will be displayed on the compatible transmitter.
• RPM
• Voltage
• Current
• Throttle
• FET Temperature
• BEC Temperature
RPM:
Volts:
Motor:
Throttle:
Fet Temp:
BEC:
0
0.0V
0.0A 0% Output
0%
0.0C
0.0C 0.0A 0.0V
Low Voltage Cutoff (LVC)
LVC is a function built into your ESC to protect the battery from over-discharge.
When the battery charge is low, LVC limits power supplied to the motor. The aircraft
will begin to slow and you will hear the motor pulse. When the motor power
decreases, land the aircraft immediately and recharge the flight battery.
NOTICE: Repeated flying to LVC will damage the battery.
Disconnect and remove the Li-Po battery from the aircraft after use to prevent trickle
discharge. Charge your Li-Po battery to about half capacity before storage. During
storage, make sure the battery charge does not fall below 3V per cell.
Install the Propeller

EN
15
Flying
RollPitch
RollPitch
RollPitch
01
2
Sensor Assisted Flight Envelope (SAFE) Technology
Flight Modes
At any time during a flight you can switch between the 3flight modes or use Panic
recovery to get your aircraft to a safe flying attitude. Change between flight modes
by changing the flight mode switch position.
Beginner Mode (position 0) Green LED on Aircraft
• Envelope limit: Pitch (nose up and down) and Roll (wing tips up and
down) angles are limited to help you keep the aircraft airborne.
• Self-leveling: when the pitch and roll controls are returned
to neutral, the aircraft returns to level flight.
• Stability assisted takeoff and landing.
• Throttle based climb and descent.
Intermediate Mode (position 1) Blue LED on Aircraft
• Natural Flight Experience: In normal training flight conditions, the pilot
experiences natural AS3X®flight for smooth handling and outstanding precision.
• Large Flight Envelope: The pilot is only prevented from entering
extreme flight conditions outside the training flight envelope.
TIP: When flying Intermediate Mode, the Apprentice STS will automatically be in
beginner mode when below 100 feet. The Blue LED will still be shown.
Experienced Mode (position 2) Red LED on Aircraft
• Natural Flight Experience: The pilot experiences natural AS3X
flight for smooth handling and outstanding precision.
• Unlimited Flight Envelope: No limit on Pitch and Roll angles (airframe limited).
Panic Recovery
This function is intended to provide you with the confidence to continue to improve
your flight skills. If you become disoriented or the aircraft is in an unknown or
uncomfortable attitude in any flight mode:
1. Press and hold the Bind/PANIC button on the transmitter and release the control
sticks. The aircraft will immediately pull out of a dive and roll wings upright and
level.
IMPORTANT: The aircraft will recover to a safer attitude even if sticks are held
while holding the PANIC button. However, release the control sticks for the quickest
recovery.
2. Release the PANIC button and continue your flight.
CAUTION: The Panic Recovery function will not avoid obstacles in the
aircraft flight path. Sufficient altitude is required for the aircraft to return to
straight and level flight if the aircraft is upside down when the panic
function is applied.
Beginner Mode
(Switch Position 0)
Intermediate Mode
(Switch Position 1)
Experienced Mode
(Switch Position 2)

EN
Apprentice STS
16
Flight Control
IMPORTANT: Even though SAFE technology is a very helpful tool, the aircraft
still needs to be flown manually. If incorrect input is given at lower altitudes or at
slower speeds, the aircraft can crash. Study these control inputs and the aircraft
response to each carefully before attempting your first flight.
For first flights, set the SAFE®flight mode switch to Beginner Mode (position0).
For smooth control of your aircraft, always make small corrections. All directions
are described as if you were sitting in the aircraft.
Flying faster or slower: When your aircraft is stable in the air, push the throttle
stick up to make the aircraft go faster. Pull the throttle stick back to slow down. The
aircraft will climb when the throttle is increased.
Elevator up and down: Push the elevator stick forward to make the aircraft go
down. Pull the elevator stick back to go up.
Aileron right and left: Move the aileron stick right to make the aircraft roll or
“bank” right. Move the aileron stick left to bank left.
TIP: Always picture yourself in the aircraft when determining which way to bank
the aircraft wings. When the aircraft is flying away from you, banking the aircraft
right or left appears normal. When flying toward you, the aircraft will appear to
bank the opposite direction to the control input given. This will become more
instinctual with experience.
Rudder left and right: Push the rudder stick left or right to yaw or point the nose
of the aircraft left or right. The rudder stick is also used to steer the aircraft left and
right while taxiing on the ground.
TIP: Similar to aileron control, picture yourself in the aircraft to determine which
direction to point the nose whether you are flying away from yourself or toward
yourself.
Transmitter Command Aircraft Response
Elevator
Aileron
Rudder

EN
17
*Failsafe (RED LED FAST FLASHING)
If the receiver loses transmitter communication, the failsafe will activate. When activated, failsafe moves the throttle channel to its preset failsafe position (low throttle)
that was set during binding. All other channels move for the aircraft to slowly circle and descend until radio link is re-established.
Flight Training
Instruction
To the new pilot:
This aircraft is easy to fly and helps you apply beginner skills to flying; however,
we recommend you get help from a qualified flight instructor for your first radio
controlled flights. Some model flying clubs provide flight training at their flying
fields. Find a nearby flying club through your local hobby shop. In the U.S., visit the
Academy of Model Aeronautics at www.modelaircraft.org. for more information on
clubs and flight instruction.
To the flight instructor:
Feel free to experiment with the SAFE technology before instructing your student on
this aircraft. The progressive switch positions in the SAFE technology are intended
for a new pilot to learn with minimal instructor assistance. We recommend using
Channel 5 Switch Position 1 to instruct a new pilot. Switch positions 0 and 2 may
stabilize the aircraft more or less than you desire for instruction purposes.
DXe Trainer Feature
Your DXe transmitter may be connected to another transmitter through the trainer
ports using a trainer cord (SPM6805, sold separately).
The DXe transmitter is ideal* as the master as it is compatible with all Spektrum
transmitters when using this feature. Servo reversing and trims must be the same
on both transmitters.
This “buddy box” approach has helped many new pilots get the feel for aircraft
control with the close assistance of a flight instructor. Connecting two transmitters
enables your flight instructor to hold the master transmitter while you hold the
slave transmitter. While you learn to fly, the instructor holds the trainer switch to
give you control of the aircraft. If you need help, the flight instructor can release the
switch to take control.
IMPORTANT: If a transmitter other than the included DXe is used for master or
slave, refer to Optional Transmitter Setup in this manual.
Trainer port
Trainer cord
Master Slave
Top
Back
Trainer Button

EN
Apprentice STS
18
Takeoff
Set the flight mode switch to Beginner Mode (position 0) for your first flights. Set a
flight timer for 8-10 minutes using a 3200mAh 3S battery pack.
Ground Launch
Once the aircraft is ready for flight, slowly advance the throttle to start the takeoff
roll into the wind. Small rudder inputs may be required for heading correction as
the aircraft will begin a slow climb out as the throttle is advanced.
TIP: Rudder / nose wheel control throw is automatically set for taxi mode in
beginner mode when on the ground and under 6 meters of altitude.
This provides more control to taxi the aircraft and yaw control during landings.
Once airborne, rudder control throw is automatically reduced to beginner flight
mode.
Slowly advance
the throttle stick.
Wind
When properly trimmed, the aircraft’s wing design causes a climb at full
throttle without the use of elevator.
50% throttleFull throttle Reduced throttle
In Flight
Let the aircraft climb at full throttle, into the wind, until the aircraft gets about 300
feet (91m) above the ground, then decrease the throttle to half (50%).
Make small and gentle stick movements to see how the aircraft responds.
Flying with the nose pointed toward you is one of the hardest things to do when
learning to fly. Practice flying in large circles high off the ground.
If you lose orientation of the aircraft, press and hold the PANIC button and the
aircraft will return to level flight.
NOTICE: If a crash is imminent, activate throttle hold or quickly lower the throttle
and throttle trim. Failure to do so could result in extra damage to the airframe, as
well as damage to the ESC and motor.
IMPORTANT: If using the buddy box option for training on a transmitter other than
the included DXe use these settings for a Master and or Slave Transmitter. Failure
to do so will not allow SAFE technology Flight modes to work correctly.
IMPORTANT: If using the buddy box option the transmitter must be configured
using the Transmitter Setup and Buddy Box setup charts.
Master Transmitter Setup
Master Transmitter Master Setup
DX4e, DX5e (2pos) Factory Trainer Settings
DX4e, DX5e (3pos) Factory Trainer Settings
DXe Factory Trainer Settings
DX6i Factory Trainer Settings
DX7 Trainer to Normal
DX6*
DX7s
DX7(G2)*
DX8
DX8(G2)*
DX9*
DX10t
DX18
DX20*
Activate Programmable Master and insure
channels Thro - Aux 1 are set to slave
When using GPS, assign master transmitter to “A”
switch or other open switch location. Do not assign to
“I” button. “I” button controls GPS holding pattern and
auto-home function.
Buddy Box Setup
Slave Transmitter Setup
Slave Transmitter Slave Setup
DX4e, DX5e (2pos) Factory Trainer Settings
DX4e. DX5e (3pos) Factory Trainer Settings
DXe Factory Trainer Settings
DX6i Factory Trainer Settings
DX7 Factory Trainer Settings
DX6
DX7s
DX7(G2)
DX8
DX8(G2)
DX9
DX10t
DX18
DX20 Factory Trainer Settings

EN
19
Adjusting Trim in flight
If your aircraft does not fly straight and level at half throttle with the sticks at
neutral, fly into the wind and adjust the trim sliders as indicated in the table until
the aircraft maintains a reasonably straight and level flight path.
• Trimming is best done in calm wind conditions.
• The SAFE flight mode switch should be set to Experienced
mode (position2) before adjusting the trims.
After the aircraft is trimmed in flight, land the aircraft and proceed to the Manually
Adjusting Trim section to set the trim mechanically.
The included RTF DXe transmitter features electronic trim buttons. The transmitter
emits a faint beep with each click of the trim buttons in either direction. Holding
the button in either direction quickly adjusts the trim several steps until the button
is released or until the trim reaches the end of its travel. If the trim button does not
beep when clicked, the trim is at the far end of its travel. Center trim is indicated by
a slightly louder beep.
TIP: Trim the aircraft at sufficiant altitude of 30 meters (about 100’). Having
an experienced flight instructor trim your aircraft during the first flight is
recommended.
Aircraft Drift Trim Required
Elevator
Elevator Trim
Elevator Trim
Aileron
Aileron Trim
Aileron Trim
Rudder
Rudder Trim
Rudder Trim
Manually Adjusting Trim
WARNING: Do not perform any maintenance with the propeller installed
on the aircraft. Serious injury or property damage could result from the
motor starting inadvertently.
The SAFE flight mode switch should be set to Experienced mode (position2) before
manually adjusting the trim settings.
The aircraft should be kept still while performing manual adjustment of trim.
With the trim settings from the trim flight still set in the transmitter, take note of the
positions of each of the control surfaces, one at a time.
Adjust the clevis on each control surface to position the surface the same as it was
with the trim offset.
1. Remove the clevis from the control horn.
2. Turn the clevis (as shown) to lengthen or shorten the pushrod.
3. Close the clevis onto the control horn and slide the tube towards the horn to
secure the clevis.
4. Move to the next control surface.
When you have all of the surface trims centered, return the trim settings on
the transmitter to neutral by pushing the trim buttons for each surface until the
transmitter emits a loud beep indicating center trim.

EN
Apprentice STS
20
IMPORTANT: We recommend flying with floats only once you have become able to
fly comfortably in Experienced flight mode.
Only use the floats if you are comfortable flying your aircraft and have repeatedly
taken off, flown and landed with success. Flying off water poses a higher risk to
the airplane because the electronics can fail if fully immersed in water.
Always ensure the optional floats (ELFA550, sold separately) are secure on the
fuselage and that the float rudder linkage is correctly connected and moves freely
before putting the aircraft in water.
To take off on water, steer with the rudder and slowly increase the throttle. Keep
the wings level on takeoff. Hold a small amount (1/4–1/3) of up elevator and the
aircraft will lift off once flying speed is reached. Avoid rapidly increasing the throttle
as torque from the motor may cause the aircraft to roll to the left when on water.
To land this aircraft on water, fly the aircraft to a couple of feet off the surface of
the water. Reduce throttle and add up elevator to flare the aircraft.
When taxiing, you must use throttle to move the aircraft forward, but steer with the
rudder stick. The stick will turn both the aircraft rudder and a small rudder attached
to the left float.
Avoid taxiing cross wind if there is a breeze, as this can cause the aircraft to flip
over if wind gets under the wing. Taxi 45 degrees into the direction of the wind
(not perpendicular to the wind) and use aileron to hold the upwind wing down. The
aircraft will naturally try to face into the wind when taxiing.
Always fully dry the aircraft after landing on water.
CAUTION: Never swim or go alone to get a downed model in the water.
CAUTION: If at any time water splashes in the fuselage while flying from
water, bring the airplane to shore, open the battery hatch and immediately
remove any water that may have gotten in the fuselage. Leave the battery hatch
open overnight to let the inside dry out and to prevent moisture damage to the
electronic components. Failure to do so could cause the electronic components to
fail, which could result in a crash.
Water Takeoff and Landing Using the Optional Float Set
45º
Up Aileron
Down Aileron
Wind
Taxi 45 degrees into the direction of the wind.
Post Flight
1 Disconnect the flight battery from the ESC (Required for Safety and battery life).
2 Power OFF the transmitter.
3 Remove the flight battery from the aircraft.
4 Recharge the flight battery.
5 Repair or replace all damaged parts.
6 Store the flight battery apart from the aircraft and monitor the battery charge.
7
Make note of the flight conditions and flight plan results, planning for future flights.
Landing
Land the aircraft manually when GPS is not installed
1. Reduce the throttle to around 50% to slow the airspeed.
2. Fly the aircraft downwind past the end of the runway.
3. Turn the aircraft into the wind and line the aircraft up with the runway
center line.
4. Decrease the throttle further and begin descending towards the runway,
keeping the wings level during approach. Try to have the aircraft at 10ft
altitude as it passes over the threshold of the runway.
5. As the aircraft passes over the threshold of the runway decrease the
throttle fully.
6. Just as the aircraft is about to touch down, gently pull back on the elevator to
raise the nose and flare for a gentle landing.
NOTICE: If a crash is imminent, activate throttle hold or quickly lower the
throttle. Failure to do so could result in extra damage to the airframe, as well as
damage to the ESC and motor.
IMPORTANT: When finished flying, never keep the aircraft in the sun. Do not store
the aircraft in a hot, enclosed area such as a car. Doing so can damage the foam.
65ft (20m)
10ft power is cut
Wind