E-FLITE YAK-54F User manual

Assembly Manual
YAK-54F

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Table of Contents
Introduction ................................................................2
Specifications .............................................................2
Contents of Kit/Parts Layout .........................................3
Optional Accessories ..................................................4
High Power Set-Up* ....................................................4
High Power Outrunner (direct drive) Set-Up* .................4
Indoor/Lightweight Outrunner (direct drive) Set-Up .........5
Warning ....................................................................5
Additional Tools and Adhesives ....................................5
Before Starting Assembly .............................................6
Using the Manual .......................................................6
Warranty Information ..................................................6
Hinging the Ailerons ...................................................7
Wing Installation ........................................................9
Horizontal Stab Installation ........................................10
Hinging the Elevator and Rudder ................................12
Servo & Receiver Installation ......................................14
Linkage Installation ....................................................16
Motor & Speed Control Installation .............................20
Landing Gear Installation ...........................................25
Center of Gravity / Battery Installation ........................27
Control Throws .........................................................28
2005 Official AMA
National Model Aircraft Safety Code .....................30
Introduction
Thank you for purchasing the Quique Somenzini
designed Yak 54F ARF Park Flyer, which is based
on his popular gas-powered competitive Yak 54F
aerobatic airplanes. Quique designed this model to
compete at top-level competitions such as the eTOC
and for nationwide demos. Quique uses his own
unique A-frame design on the fuselage shape, which
reduces flex in the more rigid fuselage giving you
more precision control.
From super slow to top airspeed, flying the Yak
features a great combination of smoothness and
precision, helping make this foam Yak-54F an
extreme 3D flying performer like no other foam
airplanes of this class. The Yak-54F will be capable
of doing all the maneuvers that you have ever dreamt
of and more.
Specifications
Wingspan: 37 in (940mm)
Length: 37.5 in (950mm)
Wing Area: 345 sq in (22.2 sq dm)
Weight w/o Battery: 10–11 oz (280–310 g)
Weight w/ Battery: 12–14 oz (340–400 g)

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Contents of Kit/Parts Layout
Large Replacement Parts:
EFL2126 Main Wing
EFL2127 Fuselage
EFL2128 Tail Assembly
EFL2129 Wheel Pants
EFL2130 Landing Gear Covers
EFL2134 Landing Gear
Small Replacement Parts:
EFL2131 Plywood Tail Control Horns
EFL2133 Aileron Rods
EFL2135 Hook & Loop & Servo Tape
EFLA200 Micro Control Horns
EFLA202 Micro Tail Skid
EFLA203 Micro Control Connectors
EFLA204 Micro Rubber Spinner
EFLA213 E-flite/JR/Horizon Decals
EFLA214 Micro Pull-Pull Set
EFLA220 Foam Park Wheels, 1.25”
EFLM207 Pinion Gear, 10T 0.4 Module
EFLM221 Gearbox, 6.6:1
EFLM222 Spur Gear, 66T w/Shaft
EFLP1260 12 x 6 Slow Flyer Prop

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Required Electronics & Accessories
JRP6654** 6102FM, R610UL & 4-S241 -
Complete radio system
JRPR610UL** R610UL 6CH FM Receiver,
Shrinkwrap
JRPS241 S241 Sub-Micro Servo (3)
JRPA212 Large Arms w/Screws - need 2
package
EFLA311 20-Amp Brushless ESC
EFLC3005 Celectra 1-3 Cell Li-Po Charger
EFLA208 Foam Safe CA / Activator
EFLA250 Park Flyer Tool Assortment, 5 pc
High Power Motor Set-Up*
EFLM1000 Park 370 Brushless Motor, 4100 Kv
EFLP1260 12 x 6 Slow Flyer Prop (2) - keep
extras on hand
EFLB1016 11.1V 1200mAh 3-Cell Li-Po, 16GA
or
THP13203S 1320mAh 3-Cell 11.1V Li-Po, 16GA
* Use with included 12 x 6 prop, 6.6:1 gearbox,
and 10T pinion. Proper throttle management is
required when using high performance set-ups.
High Power Outrunner (direct drive)
Motor Set-Up*
EFLM1305 Park 400 Outrunner Motor, 920 Kv
EFLP1047 10 x 4.7 Slow Flyer Prop (2)
or
EFLP1147 11 x 4.7 Slow Flyer Prop (2)
EFLB1016 11.1V 1200mAh 3-Cell Li-Po, 16GA
or
THP13203S 1320mAh 3-Cell 11.1V Li-Po, 16GA
* Proper throttle management is required when
using high performance set-ups.
Indoor/Lightweight Outrunner (direct
drive) Motor Set-Up
EFLM1200 Park 370 Outrunner Motor, 1080 Kv
EFLP1047 10 x 4.7 Slow Flyer Prop (2)
EFLB1005 11.1V 860mAh 3-Cell Li-Po, 16GA
THP9003S 900mAh 3-Cell 11.1V Li-Po, 16GA

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Additional Tools and Adhesives
Tools
Hobby knife
Ruler
Hot glue gun
T-Pins
Small Phillips Screwdriver (EFLA257 - included with
EFLA250)
Paper towel/tissue
String
Tape
Pliers
Hex Wrench: 3/32" (EFLA251 - included with
EFLA250)
Nut Driver: 5.5mm (EFLA255 - included with
EFLA250)
Adhesives
Hot Glue
Warning
An RC aircraft is not a toy! If misused, it can cause
serious bodily harm and damage to property. Fly
only in open areas, preferably at AMA (Academy
of Model Aeronautics) approved flying sites,
following all instructions included with your radio.
Lithium Polymer batteries are significantly more
volatile than alkaline or Ni-Cd/Ni-MH batteries
used in RC applications. All manufacturer’s
instructions and warnings must be followed closely.
Mishandling of Li-Po batteries can result in fire.

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assembly or material used for the final assembly,
no liability shall be assumed nor accepted for
any damage resulting from the use of the final
assembled product. By the act of using the
assembled product, the user accepts all resulting
liability.
Please note that once assembly of the model has
been started, you must contact Horizon Hobby,
Inc. directly regarding any warranty question.
Please do not contact your local hobby shop
regarding warranty issues, even if that is where
you purchased it. This will enable Horizon to better
answer your questions and service you in the event
that you may need any assistance.
If the buyer is not prepared to accept the liability
associated with the use of this product, the buyer
is advised to return this kit immediately in new and
unused condition to the place of purchase.
Horizon Hobby, Inc.
4105 Fieldstone Road
Champaign, Illinois 61822
[phone]
horizonhobby.com
Before Starting Assembly
Before beginning the assembly of your Yak-54F,
remove each part from its bag for inspection.
Closely inspect the fuselage, wing panels, rudder
and stabilizer for damage. If you find any
damaged or missing parts, contact the place of
purchase.
Using the Manual
This manual is divided into sections to help make
assembly easier to understand, and to provide
breaks between each major section.
Remember to take your time and follow the
directions.
Warranty Information
Horizon Hobby, Inc. guarantees this kit to be free
from defects in both material and workmanship
at the date of purchase. This warranty does not
cover any component parts damage by use or
modification. In no case shall Horizon Hobby’s
liability exceed the original cost of the purchased
kit. Further, Horizon Hobby reserves the right to
change or modify this warranty without notice.
In that Horizon Hobby has no control over the final

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Hinging the Ailerons
Required Parts
Wing Hinges (10)
Aileron (left and right)
20mm x 80mm clear tape (4)
Required Tools and Adhesives
Foam-safe CA Ruler
Paper towel / tissue
 1. Remove the ailerons from the wing. Break in
each hinge by folding them in half or over a thin
ruler, then back over itself.

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 2. Install the hinges into the aileron. Slide the
aileron hinges into the wing until there is a
slight 1/64" gap between the wing and aileron.
Apply foam-safe CA to each hinge, top and
bottom. Do not use accelerator during this
process, as the CA must soak into the hinge.
Remove excess CA with a tissue or paper towel.
 3. Locate the four 20mm x 80mm tape pieces.
Place the tape on the top and bottom along the
hinge line starting at the inside end (root) of the
aileron continuing past the hole for the control
horn. This will reinforce the aileron and help
prevent stress on the control horn. Repeat this
step for the other wing panel.

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Wing Installation
Required Parts
Wing Fuselage
Required Tools and Adhesives
Foam-safe CA Ruler
Paper towel / tissue String
T-Pins Tape
 1. Slide the wing into the fuselage. Center the
wing in the fuselage.
 2. Pin a string to the center aft fuselage.
Use the string to square the wing to the
fuselage centerline.
 3. Look directly down the fuselage from the
front. Use the fin as a reference to position
the wing 90-degrees to the vertical centerline
of the fuselage. Sand the fuselage as necessary
for alignment.

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 4. Once satisfied with the wing alignment, use
foam-safe CA to glue the wing to the
fuselage. Clean up excess glue with a tissue or
paper towel.
Note: You can use foam-safe Activator to speed
up this CA cure time.
Horizontal Stab Installation
Required Parts
Fuselage Stabilizer
Required Tools and Adhesives
Foam-safe CA Ruler
Paper towel / tissue String
T-Pins Tape
Foam-safe activator
 1. Slide the stabilizer into the fuselage, centering it
in the fuselage.

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 2. Pin the string from the previous section into the
top of the fuselage. Check the alignment of the
stabilizer using the string.
 3. Sight down the fuselage and square the
stabilizer to the wing. Sand the opening in the
fuselage if necessary.
 4. Once satisfied with the stabilizer alignment,
use foam-safe CA to glue the stabilizer to the
fuselage. Clean up excess glue with a tissue or
paper towel.
Note: You can use foam-safe Activator to speed
up this CA cure time.

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 2. Install the hinges into an elevator half. Slide
the elevator hinges into the stabilizer until there
is a slight 1/64" gap between the stabilizer
and elevator. Make sure the elevator can move
freely. Apply foam-safe CA to each hinge, top
and bottom. Do not use accelerator during this
process, as the CA must soak into the hinge.
Remove excess CA with a tissue or paper towel.
Repeat for both elevator halves.
Note: The elevator half with the slot for
the control horn goes on the left side of
the fuselage.
Hinging the Elevator and Rudder
Required Parts
Airframe Elevator (2)
Rudder Hinge (7)
Carbon fiber elevator joiner
2 5/8" x 3/8" (66 x 22 mm) (2)
Required Tools and Adhesives
Foam-safe CA
Paper towel / tissue
 1. Break in each of the four hinges by folding them
in half or over a thin ruler, then back over itself.

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 3. Locate and install the 2 5/8" x 3/8" (66mm x
10mm) carbon elevator joiners on the top and
bottom of the elevators using foam-safe CA. Do
not block the hole for the elevator control horn.
 4. Break in and install the remaining three hinges
for the rudder.

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 1. Use hot glue to install the rudder, elevator and
aileron servos.
Servo & Receiver Installation
Required Parts
Airframe Double-sided tape
Servo extension, 3" Servo (3)
Receiver
Required Tools and Adhesives
Hot glue

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 2. Use double-sided tape to attach the receiver
to the inside of the fuselage. Use a short 3"
extension for the aileron servo if needed.

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 1. Install the plywood control horns for the elevator
and rudder using foam-safe CA. Square the
horns to the control surface.
Linkage Installation
Required Parts
Airframe Cable crimp (8)
Plywood control horn (2) Control cable
Micro control connector (6)
Control connector back plate (6)
2mm x 3mm screw (6)
Micro control horn (2)
Micro control horn back plate (2)
Micro cable adjust connector (4)
Aileron linkage, 6-inch (2)
Long servo arm (3)
Required Tools and Adhesives
Foam-safe CA
Pliers (for crimping)
Phillips screwdriver (small)

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 2. Install the six micro control connectors into each
of the three long servo arms. Secure them using
the control connector back plates.
 3. With the radio system on, install the servo arms
on the servos.

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 4. Use tape to hold the rudder in neutral. Slide a
cable crimp onto the control cable. The cable
then goes through the horn, then back through
the crimp. Use pliers to secure the crimp.
 5. Silde the micro cable adjust connector into
the micro control connector and use a 2mm x
3mm screw to hold it in position. Repeat Step 4,
installing the cable through the cable connector.
 6. Remove the tape from the control surface.
Install the second cable following Steps 4
and 5. Tension the cables lightly using the
cable connectors to pull the surface into neutral.

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 7. Repeat Steps 4 through 6 for the elevator
cables.
 8. Attach the micro control horn to the ailerons
using the micro control horn back plates and
foam-safe CA.
 9. Pass the “Z” bend of the aileron linkages
through the control horns. The opposite end
goes through the micro control connector. With
everything centered, secure the linkages using
the 2mm x 3mm screws.

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Motor & Speed Control Installation
Required Parts
Airframe
6.6:1 (66T spur) gearbox (if you are not installing
an Outrunner motor)
10T pinion gear, 0.4 module x 6mm
12 x 6 prop (use 12 x 6 if you are using the
gearbox with our recommended motor)
2.5mm x 10mm sheet metal screws (4)
3mm x 8mm screws/3mm washers (2) (use for
mounting Outrunner motor)
50mm x 85mm fuselage doubler
Brushless motor
Brushless speed control
1/2" x 6 3/4" (13mm x 170mm) tape
Required Tools and Adhesives
Foam-safe CA
Phillips screwdriver (small)
Hex wrench, 3/32"
Note: Steps 1 through 4 are for installing a
gearbox and motor, while Steps 5 though 7 are
for installing an Outrunner motor
 1. It may be necessary to attach motor adapters
or other accessories to your particular motor
at this time.
Note: Use the instructions provided with the motor
to install any accessories. Follow the instructions
provided with the gearbox for some helpful hints
for installing the motor. When installing your motor
into the E-flite™ gearbox, it is very important that
the gear mesh is set correctly and is smooth with
no binding. The E-flite gearbox features adjustable
slotted mounting holes to ensure your gear mesh is
correct. Remember if the gear mesh is too loose or
too tight, it may strip the gears. To extend the life
of your gearbox, we also recommend using a small
amount of grease, such as lithium grease, on the
spur gear.
It is also very important to check to be sure the
propeller is balanced before installing onto the
shaft. An unbalanced propeller may strip the gears.
When installing the propeller, please be sure not to
over-tighten the 3mm lock nut. The use of the lock
nut will prevent the propeller from coming loose.