JR X9303 2.4 Owner's manual

INSTRUCTION AND
PROGRAMMING MANUAL
X9303 2.4
9-CHANNEL COMPUTER RADIO
SYSTEM WITH SPEKTRUM 2.4GHz DSM
TECHNOLOGY

Table of Contents
G-2
Section 1: Using the Manual .........................................................................................................G-9
Features......................................................................................................................................................... G-9
Specications................................................................................................................................................ G-9
Section 2:Transmitter and Receiver Specifications.................................................................G-9
JR X9303 Transmitter..................................................................................................................................... G-9
JR R921 Receiver ..........................................................................................................................................G-10
Features.......................................................................................................................................................G-10
Specications..............................................................................................................................................G-10
Section 3: Component Specifications.......................................................................................G-11
Servo Specications......................................................................................................................................G-11
Charger Specifications .................................................................................................................G-11
Airborne Battery Pack.................................................................................................................G-11
Airborne Battery Pack Specications...................................................................................................G-11
Battery Charging...........................................................................................................................G-12
Transmitter/Receiver....................................................................................................................................G-12
JR Transmitter Charging...........................................................................................................................G-12
Using the Included Charger....................................................................................................................G-12
X9303 2.4 Transmitter Features (Mode 2 Airplane Shown)...............................................G-13
X9303 2.4 Transmitter Features (Rear)...................................................................................G-14
Battery Cover............................................................................................................................................G-14
X9303 2.4 Transmitter Features (Internal) .............................................................................G-15
Control Stick Tension Adjustment.............................................................................................................G-15
Back of Transmitter (Mode 2)................................................................................................................G-15
Advanced Digital Trims ................................................................................................................................G-16
Control Stick Length....................................................................................................................................G-16
Neckstrap Attachment.................................................................................................................................G-16
Installing the Receiver..................................................................................................................................G-17
Installing the JR R921 ...............................................................................................................................G-17
Model Match ..................................................................................................................................G-18
Other Important Installation Tips .........................................................................................................G-18
Binding .............................................................................................................................................G-19
How To Bind...................................................................................................................................................G-19
Fail-Safe Functions.........................................................................................................................................G-20
SmartSafe ........................................................................................................................................................G-20
Receiver Power Only...............................................................................................................................G-20
After Connection......................................................................................................................................G-20
Preset Fail-Safe...............................................................................................................................................G-20
Receiver Power Only...............................................................................................................................G-20
After Connection......................................................................................................................................G-20
Programming SmartSafe ..............................................................................................................................G-20
(All Spektrum Aircraft Receivers) .........................................................................................................G-20
Programming Preset Fail-Safe.....................................................................................................................G-21
(JR R921 and Spektrum AR 9000 Receivers Only) ...........................................................................G-21

Table of Contents
G-3
Standard Range Testing ................................................................................................................G-21
Range Testing the X9303 2.4 ..................................................................................................................G-21
Advanced Range Testing Using a Flight Log............................................................................G-22
Advanced Range Testing the X9303 2.4...............................................................................................G-22
Flight Log—Optional for JR R921 Receiver ...........................................................................G-23
Using the Flight Log..................................................................................................................................G-23
Receiver Power System Requirements....................................................................................G-24
Recommended Power System Guidelines...............................................................................................G-24
Flash Memory ................................................................................................................................G-25
Battery Alarm and Display..........................................................................................................G-25
Tip on Using 2.4GHz Systems...................................................................................................G-25
AIRPLANE – ACRO MODE......................................................................................................... A-1
Flight Modes..................................................................................................................................................A-1
ACRO PROGRAMMING - PLEASE READ ...........................................................................................A-1
ACRO - GETTING STARTED – SYSTEM MENU BASICS................................................................A-1
ACCESS THE SYSTEM MENU......................................................................................................................A-2
SELECT A MODEL MEMORY.......................................................................................................................A-2
RESET THE MODEL........................................................................................................................................A-3
TO ACTIVATE THE ACRO MODE..............................................................................................................A-4
ENTER A NAME FOR THE MODEL...........................................................................................................A-4
ACRO - SYSTEM MENU - ADVANCED FUNCTIONS........................................................ A-5
FLIGHT MODES ..............................................................................................................................................A-6
To Activate Flight Modes ................................................................................................................................A-7
TRIM:COM (Flight Modes)............................................................................................................................A-8
D/R:SW (Flight Modes) ..................................................................................................................................A-8
SWITCH ASSIGNMENTS..............................................................................................................................A-9
FLAP TRIM ON/OFF.......................................................................................................................................A-9
ACTIVATE/INHIBIT SWITCHES............................................................................................................... A-10
WING TYPE................................................................................................................................................... A-11
WING Parameter – (Wing Type) .............................................................................................................. A-12
V-tail (Wing Type).......................................................................................................................................... A-14
Dual Channels (Wing Type) ........................................................................................................................ A-14
Twin E. (Wing Type) ...................................................................................................................................... A-16
TRIM STEP...................................................................................................................................................... A-18
ACRO – FUNCTION LIST.................................................................................................................... A-19
REV.SW – SERVO REVERSING ................................................................................................................ A-19
SUB TRIM........................................................................................................................................................ A-20
TRVL ADJ. – TRAVEL ADJUST ................................................................................................................... A-21
D/R & EXP – DUAL RATE AND EXPONENTIAL ............................................................................... A-22
THRO CURV – THROTTLE CURVE........................................................................................................ A-23
FLAP SYS. – FLAP SYSTEM......................................................................................................................... A-25
AUTO LAND (Flap System)....................................................................................................................... A-26
ELEV – ELEVATOR COMPENSATION (Flap System).......................................................................... A-27

Table of Contents
G-4
FLAP – (Flap System) ................................................................................................................................... A-28
FM0-FM2 (Flap System) ............................................................................................................................... A-29
Delay (Flap System) ...................................................................................................................................... A-30
ELEFLP M – ELEVATOR-TO-FLAP MIXING...................................................................................... A-31
AILRUD M – AILERON-TO-RUDDER MIXING ............................................................................. A-32
AIL DIFF. – AILERON DIFFERENTIAL ..................................................................................................... A-33
SRV. SPEED – SERVO SPEED...................................................................................................................... A-35
SNAP ROLL.................................................................................................................................................... A-36
GYRO SYS. – GYRO SYSTEM.................................................................................................................... A-37
GYRO CONNECTIONS (Gyro System)................................................................................................ A-37
FIXED GYRO GAIN (Gyro System)........................................................................................................ A-38
STICK OVERRIDE GYRO GAIN (Gyro System).................................................................................. A-39
PROG MIX – PROGRAMMABLE MIXERS ............................................................................................. A-40
STANDARD PROGRAMMABLE MIXER – Example: DOWN ELEVATOR AT IDLE..................... A-41
MULTI-POINT MIXER – Example: ELIMINATE PITCH-COUPLING............................................... A-43
TRAINER – TRAINER SYSTEM................................................................................................................. A-45
XP9303 USED AS MASTER (INSTRUCTOR) – (Trainer System)..................................................... A-45
X9303 2.4 USED AS SLAVE (STUDENT) – (Trainer System) ............................................................ A-46
TIMER – TIMER SYSTEM............................................................................................................................. A-47
MONITOR...................................................................................................................................................... A-48
UTILITY FUNCTIONS................................................................................................................................ A-49
COPY – COPY THE CURRENTLY SELECTED MODEL TO ANOTHER MODEL MEMORY... A-49
TRANSFER – TRANSFER THE MODEL TO ANOTHER TRANSMITTER OR TO DataSafe....... A-51
RECEIVE A MODEL INTO THE X9303 2.4 – (Transfer function)..................................................... A-51
RECEIVE A MODEL INTO THE X9303 2.4 – (Transfer function)..................................................... A-52
SUB TRIM USAGE AND MECHANICAL ADVANTAGE..................................................................... A-53
SUB TRIM.................................................................................................................................................... A-53
MECHANICAL ADVANTAGE............................................................................................................... A-53
DUAL RATES AND EXPONENTIAL CURVES ..................................................................................... A-54
Setup Sheet (Aircraft) .................................................................................................................................. A-55
X9303 2.4 Helicopter – Heli Mode ...........................................................................................H-1
INTRODUCTION...................................................................................................................................... H-1
Heli PROGRAMMING - PLEASE READ.................................................................................................... H-1
HELI - GETTING STARTED – SYSTEM MENU BASICS....................................................................... H-1
ACCESS THE SYSTEM MENU..................................................................................................................... H-2
Model SEL- Model Selection......................................................................................................................... H-2
Copy – Copying the Currently Selected Model to Another Model Memory................................... H-3
Data Reset – RESET THE MODEL ............................................................................................................. H-5
Type Select – TO ACTIVATE THE HELI MODE....................................................................................... H-6
MDL Name-ENTER A NAME FOR THE MODEL................................................................................... H-6
TRANSFER – TRANSFER THE MODEL TO ANOTHER TRANSMITTER OR TO DATASAFE .... H-7
TRANSFER A MODEL FROM THE X9303 2.4 – (Transfer function) – To Send.............................. H-7
TRANSFER A MODEL TO THE X9303 2.4 – (Transfer function) – To Receive............................... H-8
TRIM STEP........................................................................................................................................................ H-9

Table of Contents
G-5
HELI - SYSTEM MENU - ADVANCED FUNCTIONS.......................................................................... H-10
ADDITIONAL FLIGHT MODES 3 and 4 ...............................................................................................H-10
RUD TRIM: COM – (Flight Mode Trim Options)...................................................................................H-11
SWITCH ASSIGNMENTS...........................................................................................................................H-11
ACTIVATE/DEACTIVATE SWITCHES.....................................................................................................H-12
GOVERNOR PROGRAM ACTIVATION ................................................................................................ H-12
SWASH TYP-SWASHPLATE TYPE............................................................................................................H-13
Accessing the Swashplate Type Function .................................................................................................H-13
FUNCTION MODE.....................................................................................................................H-14
HELI – FUNCTION LIST............................................................................................................................H-14
D/R & EXP – DUAL RATE AND EXPONENTIAL ............................................................................... H-14
Auto Dual Rate..............................................................................................................................................H-15
REV.SW - SERVO REVERSING .................................................................................................................H-15
Sub Trim...........................................................................................................................................................H-16
TRVL ADJ. – TRAVEL ADJUST ................................................................................................................... H-17
Swash Mix- CCPM SWASHPLATE Mixing .............................................................................................H-18
Variations of CCPM Mixing .................................................................................................................... H-18
CCPM Servo Connection/Channel Numbers.................................................................................... H-18
Accessing the Swashplate Mixing Function.........................................................................................H-19
CCPM Exponential (EXP) ...........................................................................................................................H-19
THRO HOLD- THROTTLE HOLD..........................................................................................................H-20
Accessing the Throttle Hold Function ................................................................................................. H-20
Stick Auto/Auto Cut Setting....................................................................................................................... H-21
Hold Delay......................................................................................................................................................H-21
THRO CURV – THROTTLE CURVES......................................................................................................H-22
Accessing the Throttle Curve Function...............................................................................................H-23
Throttle Trim Lever Function.....................................................................................................................H-24
Hovering Throttle Lever..............................................................................................................................H-24
Throttle Curve Exponential ....................................................................................................................... H-24
Accessing the Throttle Curve Exponential Function........................................................................H-24
PIT. CURV/PITCH CURVES Function.......................................................................................................H-25
Accessing the Pitch Curve Function.....................................................................................................H-25
Hovering Pitch Lever....................................................................................................................................H-26
Example of Throttle Curve and Pitch Curve Settings ......................................................................H-26
Accessing the Revolution Mixing Function .........................................................................................H-27
Setting up Revolution Mixing..................................................................................................................H-27
REVO.MIX/Revo Mix Function: Non Heading Lock Gyros Only.......................................................H-27
GYRO SENS/Gyro Gain Function.............................................................................................................H-28
Accessing the Gyro Gain Function ....................................................................................................... H-28
Gyro Remote Gain Connections: JR G500T, JR770 and Others...................................................H-29
Remote Gain Gyros .....................................................................................................................................H-29
Mixing – Cyclic-to-Throttle Mixing...........................................................................................................H-29
Rudder-to-Throttle Mixing .........................................................................................................................H-30
Accessing the Cyclic-to-Throttle Function.........................................................................................H-31

Table of Contents
G-6
Aileron-to-Throttle and Elevator-to-Throttle Mixing...........................................................................H-31
Setting the Desired Flight Modes for Cyclic-to-Throttle Mixing...................................................H-31
GOVERNOR- GOVERNOR FUNCTION .............................................................................................H-32
Accessing the Governor Function ........................................................................................................H-32
PROG MIX 1-6 – PROGRAMMABLE MIXES 1 through 6..................................................................H-33
Swashplate Timing Mixes Example: Elevator-to-Aileron (Corrects Vertical Tracking)....................H-35
Swashplate Timing:Aileron-to-Elevator (Corrects Rolling Maneuvers)............................................H-37
STANDARD PROGRAMMABLE MIXES – Example: Right Aileron with Positive Pitch............H-39
MULTI-POINT MIXES – Example: FMOD to Gear Mixing (Retract and other Functions)......... H-41
Trainer – Programmable Trainer System..................................................................................................H-44
X9303 2.4 USED AS MASTER (INSTRUCTOR) – (Trainer System)............................................ H-44
X9303 2.4 USED AS SLAVE (STUDENT) – (Trainer System)........................................................H-45
Timer – Timer System .................................................................................................................................H-46
MONITOR- SERVO MONITOR ............................................................................................................... H-47
Setup Sheet (Helicopter).............................................................................................................................H-48
Sailplane – GLID Mode...................................................................................................................S-1
SYSTEM MODE GLID FEATURES ...........................................................................................................S-1
FUNCTION MODE GLID FEATURES ...................................................................................................S-1
System Mode......................................................................................................................................................S-2
System Mode......................................................................................................................................................S-2
To enter System Mode:................................................................................................................................S-2
Model Select.......................................................................................................................................................S-3
Copy – Copying the Currently Selected Model to Another Model Memory.....................................S-4
Model Name ......................................................................................................................................................S-6
Type Select..........................................................................................................................................................S-6
Model Reset .......................................................................................................................................................S-7
TRANSFER – Transfer the Model to Another Transmitter or to DataSafe .........................................S-8
TRANSFER a model from the X9303 2.4 – (Transfer function) ............................................................S-8
TRANSFER a model to the X9303 2.4 – (Transfer function).................................................................S-9
Trim Step.......................................................................................................................................................... S-10
Device Select................................................................................................................................................... S-11
Flight Modes................................................................................................................................................ S-11
Activating and Assigning Flight Modes....................................................................................................... S-12
Motor Function .............................................................................................................................................. S-13
Flap and AUX Functions ............................................................................................................................... S-14
Activating / Inhibiting Channels .............................................................................................................. S-14
Wing Type ........................................................................................................................................................ S-15
Function Mode ........................................................................................................................................... S-16
D/R & EXP – DUAL RATE AND EXPONENTIAL ................................................................................ S-18
REV.SW – SERVO REVERSING ................................................................................................................. S-19
SUB TRIM......................................................................................................................................................... S-20
TRVL.ADJ - TRAVEL ADJUST..................................................................................................................... S-21
Elevator-to-Flap Mix ...................................................................................................................................... S-21
Aileron-to-Flap Mix ....................................................................................................................................... S-22
Differential....................................................................................................................................................... S-22

Table of Contents
G-7
Camber Adjust................................................................................................................................................ S-23
Camber Mix .................................................................................................................................................... S-24
Aileron-to-Rudder Mix................................................................................................................................. S-25
Buttery Mix (Landing Flaps)....................................................................................................................... S-26
Flap Rate........................................................................................................................................................... S-27
Motor Hold ..................................................................................................................................................... S-27
Programmable Curve Mix 1 (Programmed for Spoiler-to-Elevator Mix).......................................... S-28
PROG MIX - PROGRAMMABLE MIXERS............................................................................................... S-29
MULTI-POINT PROGRAMMABLE MIXER ............................................................................................. S-33
Trainer – Programmable Trainer System................................................................................................... S-36
X9303 2.4 USED AS MASTER (INSTRUCTOR) – (Trainer System)............................................. S-36
X9303 2.4 USED AS SLAVE (STUDENT) – (Trainer System)......................................................... S-37
Timer ................................................................................................................................................................ S-37
Monitor ............................................................................................................................................................ S-38
Programming a 6-Channel Sailplane by Engineering Manager John Adams......................S-39
Channel Assignment .................................................................................................................................. S-41
Step #1 Servo Assignment .......................................................................................................................... S-41
Step #2- System Mode.................................................................................................................................. S-42
Step #3 Selecting a Model Memory........................................................................................................... S-42
Step #4 Selecting Model Type...................................................................................................................... S-43
Step #5 Naming a Model.............................................................................................................................. S-43
Step #6 Turning Off the Spoiler Stick Trim............................................................................................... S-44
Step #7 Establishing Flight Modes .............................................................................................................. S-44
Step #8 Wing and Tail Type Select .............................................................................................................. S-45
Step #9 Entering FUNC.LIST...................................................................................................................... S-45
Step #10 Servo Reversing............................................................................................................................ S-46
Step #11 Sub Trim.......................................................................................................................................... S-47
Step #12 Travel Adjust................................................................................................................................... S-48
Step #13 Buttery (Landing Flaps)............................................................................................................. S-48
Setting-up Flight Modes............................................................................................................................ S-49
Launch Mode Setup................................................................................................................................... S-49
Step #14 Spoiler to Elevator Curve Mix (Programmable Mix 1) ....................................................... S-49
Step #15 Launch Pre-sets ............................................................................................................................ S-50
Step #16 Dual Rate and Exponential......................................................................................................... S-51
Step #17 Elevator-to-Flap Mix .................................................................................................................... S-51
Step #18 Aileron-to-Flap .............................................................................................................................. S-52
Step #19 Aileron Differential....................................................................................................................... S-52
Flaperon Mix ............................................................................................................................................... S-53
Step #20 Flap Rate, Camber Mix and Camber Adjust........................................................................... S-53
Step #21 Flap Rate, Camber Mix and Camber Adjust (continued) .................................................... S-54
Flaperon Mix ............................................................................................................................................... S-54
Flaperon Mix Delay.................................................................................................................................... S-54
Setting up Cruise Mode............................................................................................................................ S-55
Step #22- Aileron-to-Rudder Mix ............................................................................................................. S-55
Step #23 Cruise Pre-sets ............................................................................................................................. S-56

G-8
Step #24 Dual Rate and Exponential......................................................................................................... S-56
Step #25 Elevator-to-Flap Mix .................................................................................................................... S-57
Step #26 Aileron-to-Flap .............................................................................................................................. S-58
Step #27 Aileron Differential....................................................................................................................... S-58
Flap Rate ...................................................................................................................................................... S-59
Flaperon Mix ............................................................................................................................................... S-59
Step #28 Flap Rate, Camber Mix and Camber Adjust........................................................................... S-59
Step #29 Flap Rate, Camber Mix and Camber Adjust (continued) .................................................... S-60
Flaperon Mix Delay.................................................................................................................................... S-60
Setting Up Land Mode .............................................................................................................................. S-61
Step #30 Aileron-to-Rudder Mix .............................................................................................................. S-61
Step #31 Land Pre-sets................................................................................................................................. S-62
Step #32 Dual Rate and Exponential......................................................................................................... S-63
Step #33 Elevator-to-Flap Mix .................................................................................................................... S-64
Step #34 Aileron-to-Flap .............................................................................................................................. S-64
Step #35 Aileron Differential....................................................................................................................... S-64
Flaperon Mix ............................................................................................................................................... S-65
Flaperon Mix ............................................................................................................................................... S-65
Step #36 Flap Rate, Camber Mix and Camber Adjust........................................................................... S-65
Step #37 Flap Rate, Camber Mix and Camber Adjust (continued) .................................................... S-66
Step #38 Aileron-to-Rudder Mix .............................................................................................................. S-66
Flaperon Mix Delay.................................................................................................................................... S-66
Setup Sheet (Sailplane).................................................................................................................................. S-67
Servo Precautions.......................................................................................................................................... W- 1
General notes ................................................................................................................................................. W- 1
Federal Aviation Administration.................................................................................................................. W-2
1. Purpose .................................................................................................................................................... W- 2
2. Background.............................................................................................................................................. W-2
3. Operating Standards ............................................................................................................................. W-2
Warning........................................................................................................................................................ W-3
Warranty Period ........................................................................................................................................ W-3
Limited Warranty ....................................................................................................................................... W-3
Damage Limits ............................................................................................................................................ W- 3
Safety Precautions...................................................................................................................................... W-3
Questions,Assistance, and Repairs ........................................................................................................ W- 3
Warranty and Service Information ............................................................................................................ W- 3
Warranty and Service Information ............................................................................................................ W- 4
Inspection or Repairs................................................................................................................................ W-4
Warranty Inspection and Repairs........................................................................................................... W-4
Non-Warranty Repairs............................................................................................................................. W-4
Safety, Precautions, and Warnings........................................................................................................... W-4
Instructions for Disposal of WEEE by Users in the European Union............................................ W-5
FCC Information........................................................................................................................................ W-5

JR X9303 Transmitter
Section 2: Transmitter and Receiver Specifications
Section 1: Using the Manual
G-9
JR’s X9303 2.4 offers airplane, helicopter and sailplane
pilots sophisticated programming that JR’s 9303 is
famous for with the added benefits of fully integrated
Spektrum 2.4GHz DSM®radio link technology. DSM
(Digital Spektrum Modulation) technology offers a far
superior RF link than narrow band 72MHz FM and PCM
systems, providing a higher level of confidence and
safety. Now with even the most sophisticated models
up to 9 channels, you’ll no longer have to wait for an
open frequency, worry about someone unintentionally
powering up on the same frequency, or have to plan a
frequency-based flight matrix for competition. And for
response-critical aircraft like 3D helicopters and airplanes,
latency (the time it takes for a stick input to translate to a
servo output) is significantly reduced providing a more
responsive precise connection to your model.
Features
• Fully integrated 2.4GHz Spektrum RF link
• Sophisticated three-model-type programming: Airplane, Helicopter, Sailplane
• Patented DuaLink™Technology
• ModelMatch™
• ServoSync™
• Rolling Selector input
• Digital 3+1 trims
• 30-model memory
Specifications
• Model number—Airplane/Sailplane (JRP2910), Helicopter (JRP2920)
• Number of channels—9
• Modulation type—Direct Sequence Spread Spectrum DSM2/ DSM1 protocol
• Band—2.400 to 2.483GHz
• Spectral capacity—40 simultaneous systems
• Transmitter Current—180mA/DSM2 280mA/ DSM1
• Resolution—2048 w/R921 receiver
In the front of this manual you will find common
transmitter features and specifications plus information
on the included components and accessories. Guidelines
for receiver and servo installation are also included. In
each section of this manual (Air, Heli and Sailplane) are
instructions for adjusting model-specific programming
and functions. An explanation of the purpose of each
programming function is provided, followed by an
illustration of its corresponding LCD display and
instructions on how to access and adjust the function.
A blank data sheet has been included at the end of
each section, as well as on the JR web site. Once all
data has been input for a particular model, it is highly
recommended that you record these values and settings
on a copy of the data sheet, so in the rare event of a loss
of memory, these settings are available.
Note: The manual for the X9303 2.4 manual is posted
online at www.horizonhobby.com in the support section or
it can be ordered from your local hobby dealer or directly
from Horizon Hobby.

JR R921 Receiver
G-10
The R921 receiver combines two internal with one or
two (optional) remote receivers, offering superior path
diversity. The radio system simultaneously transmits
on two frequencies, creating up to four RF paths on two
different 2.4GHz channels. This multi path redundancy,
plus the fact that each of the up to 4 receivers are located
in different locations throughout the aircraft exposes each
to a different RF environment creating a superior RF
link in all conditions. The JR R921 allows the use
of an optional Flight Log Data Recorder (SPM5940) to
be used. The flight log plugs into the data port and
provides quality of RF link data of the previous flight
allowing the confirmation of the operational performance
of the systems.
Features
• 9 channels
• 2 internal receivers
• 1 or 2 (optional) remote receiver(s)
• Patented multi-link technology
• Two types of fail-safe—SmartSafe and Preprogrammed fail-safe
• Flight Log compatible
Specifications
• Number of Channels—9
• Modulation—DSM2
• Band—2.400 to 2.4835GHz
• Dimensions (WxLxH)—.35”x2.06”x0.55”
• Weight—Main 15g/.6oz Remote 3g/.2 oz each
• Current—70mA
• Voltage range—3.5 to 9.6V
Note: The X9303 2.4 is compatible with all current Spektrum DSM aircraft receivers including:
AR6000 6-channel parkflyer receiver
AR6100 6-channel 3.5-gram parkflyer receiver
AR6200 6-channel full-range receiver
AR7000 7-channel full-range receiver
AR9000 9-channel full-range receiver
Important: When using the X9303 2.4 with parkflyer receivers (the AR6000 and AR6100), it’s imperative that these
receivers only be flown in parkflyer-type aircraft (small electric airplanes or mini and micro helicopters). Flying
receivers designed for parkflyers in larger aircraft could cause loss of control.