MS: 65
ASSEMBLY MANUAL
Kit features.
• Ready-made—minimal assembly & finishing required.
• Ready-covered covering.
• Photo-illustrated step-by-step Assembly Manual.
Made in Vietnam.
Specifications
Wingspan---------------------------------------- 57 in---------------------------- 145cm.
Wing area---------------------------------------- 697 sq.in------------------- 45 sq.dm.
Approximate flying weight------------------ 6.4-7.5lbs------------------- 2.9-3.4kg.
Length-------------------------------------------- 52.8 in--------------------------- 134cm.
Recommended engine size---------------- .61 cu.in---------------------- 2-stroke.
.72-.82 cu.in------------------ 4-stroke.
Radio System required 4 channels with 6 digital servos.
Flying skill level Intermediate/advanced.
YAK 54. Instruction Manual
2
INTRODUCTION.
Thank you for choosing the YAK 54 ARTF by SEAGULL MODELS. The YAK 54 was designed
with the intermediate/advanced sport flyer in mind. It is a scale airplane which is easy to fly and quick
to assemble. The airframe is conventionally built using balsa, plywood to make it stronger than the
average ARTF , yet the design allows the aeroplane to be kept light. You will find that most of the work
has been done for you already. The motor mount has been fitted and the hinges are pre-installed
. Flying the YAK 54 is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your YAK 54. Use the parts listing below to identify
all parts.
WARNING.
Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it
is capable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU
ASSUME ALL RISK & RESPONSIBILITY.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C
supplier and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be able
to advise on any insurance and safety regulations that may apply.
ADDITIONAL ITEMS REQUIRED.
.61 2-stroke engine
.72-.82 4-stroke engine
Computer radio with six digital
servos.
Glow plug to suit engine.
Propeller to suit engine.
Protective foam rubber for radio
system.
Silicone fuel line.
TOOLS & SUPPLIES NEEDED.
Thick cyanoacrylate glue.
30 minute epoxy.
5 minute epoxy.
Hand or electric drill.
Assorted drill bits.
Modelling knife.
Straight edge ruler.
2mm ball driver.
Phillips head screwdriver.
220 grit sandpaper.
90° square or builder’s triangle.
Wire cutters.
Masking tape & T-pins.
Thread-lock.
Paper towels.
PARTS LISTING.
FUSELAGE ASSEMBLY
(1) Fuselage.
(1) Canopy hatch.
WING ASSEMBLY
(1) Right wing half/ aileron.
(1) Left wing half with/ aileron.
(1) Aluminium dihedral brace.
Tail section assembly
(1) Horizontal stabilizer/ elevator
halves.
(1) Rudder halves.
Some more parts.
HARDWARE PACK
COWLING
Landing gear.....
www.seagullmodels.com
3
NOTE: To avoid scratching your new aero-
plane we suggest that you cover your
workbench with an old towel. Keep a
couple of jars or bowls handy to hold
the small parts after you open the
bags.
Please trial fit all parts. Make sure you
have the correct parts and that they
fit and are aligned properly before
gluing! This will ensure proper assembly as the YAK 54 is made from
natural materials and minor adjustments may have to be made.
The paint and plastic parts used in
this kit are fuel proof. However, they
are not tolerant of many harsh chemicals including the following: paint
thinner, cyano-acrylate glue accelerator, cyanoacrylate glue de-bonder
and acetone. Do not let these chemicals come in contact with the colours
on the covering and the plastic parts.
Please contact Horizon Hobby for product support and technical assistance at 877-
504-0233. Replacement parts are available from your local dealer or through Horizon
Hobby .
HORIZON HOBBY DISTRIBUTIONS INC
4105 Fieldstone Rd, Champaign, IL 61822- USA
FOR USA MARKET ONLY.
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 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 assembly or material used for the final assembly,
no liability shall be assumed nor accepted for any damage resulting from the use by the user
of the final user-assembled product. By the act of using the user-assembled product, the user
accepts all resulting liability.
Once assembly of the model has been started, you must contact Horizon Hobby, Inc. directly
regarding any warranty question that you have. 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
4105 Fieldstone Road
Champaign, Illinois 61822
(217) 355-9511
YAK 54. Instruction Manual
4
1) Carefully remove the aileron from one of
the wing panels. Note the position of the hinges.
2) Remove each hinge from the wing panel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the wing
panel until the T-pin is snug against the wing
panel. This will help ensure an equal amount
of hinge is on either side of the hinge line when
the aileron is mounted to the aileron.
HINGING THE AILERONS.
3) Slide the wing panel on the aileron until
there is only a slight gap. The hinge is now
centered on the wing panel and aileron.
Remove the T-pins and snug the aileron
against the wing panel. A gap of 1/64” or less
should be maintained between the wing panel
and aileron.
4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
ailerons front surface should lightly contact the
wing during this procedure. Ideally , when the
5) T urn the wing panel over and deflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge, making sure that the C/A penetrates into
both the aileron and wing panel.
The hinge is constructed of a special
material that allows the C/A to wick or
penetrate and distribute throughout the
hinge, securely bonding it to the wood
structure of the wing panel and aileron.
hinges are glued in place, a 1/64” gap or less
will be maintained throughout the lengh of the
aileron to the wing panel hinge line.
Note:
The control surfaces, including the
ailerons, elevators, and rudder, are
prehinged with hinges installed, but the
hinges are not glued in place. It is
imperative that you properly adhere the
hinges in place per the steps that follow
using a high-quality thin C/A glue.
Note:
C/A glue.
Hinge.
T-pin.
T-pin.
C/A glue.
T-pin.
www.seagullmodels.com
5
3x20mm.
HINGING THE ELEVATOR.
8) After both ailerons are securely hinged,
firmly grasp the wing panel and aileron to
make sure the hinges are securely glued and
cannot be pulled out. Do this by carefully
applying medium pressure, trying to separate
the aileron from the wing panel. Use caution
not to crush the wing structure.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
6) Using C/A remover/debonder and a
paper towel, remove any excess C/A glue that
may have accumulated on the wing or in the
aileron hinge area.
HINGING THE RUDDER.
Glue the elevator hinges in place using the
same tectniques used to hinge the ailerons.
Glue the rudder hinges in place using the
same tectniques used to hinge the ailerons.
Work the aileron up and down several
times to “work in” the hinges and check
for proper movement.
Note:
TURNBUCKLE INSTALLATION.
The hole location of turnbuckles shown in picture below .
The mounting holes of turnbuckle was
pre-drilled at factory.
Installing the turnbuckle for tail strut of horizontal fin as same as pictures below.
See pictures below:
Mark and drill 4 holes for engine mount.
3x25mm.
ENGINE MOUNT INST ALLATION.
Horizontal fin bottom.
Turnbuckle.
Hinge.
pre-drilled at factory
YAK 54. Instruction Manual
6
2) Using a modeling knife, cut one length
of silicon fuel line. Connect one end of the line
to the weighted fuel pick up and the other end
to the nylon pick up tube.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
4) Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using a
modeling knife. If flashing is present, make
sure none falls into the tank.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
the rear of the tank and move freely inside the
tank. The top of the vent tube should rest just
below the top of the tank. It should not touch
the top of the tank.
6) When satisfied with the alignment of
the stopper assembly tighten the 3 x 20mm
machine screw until the rubber stopper expands and seals the tank opening. Do not
overtighten the assembly as this could cause
the tank to split.
Important:
When the stopper assembly is installed in the tank, the top of the vent tube
should rest just below the top surface of the
tank. It should not touch the top of the tank.
1) Using a modeling knife, carefully cut
off the rear portion of one of the 3 nylon tubes
leaving 1/2” protruding from the rear of the
stopper. This will be the fuel pick up tube.
INST ALLING THE STOPPER ASSEMBL Y.
FUEL TANK INSTALLATION.
Att ach the silicone fuel and pressure pipes
to the tank. The lower pipe is the ‘feed’ and the
upper two the ‘pressure and fill’. The fill pipe is
the next pipe.
Vent tube.
Fuel pick up tube.
Fuel fill tube.
www.seagullmodels.com
7
1) Assemble and mounting the wheel pants
as shown in the following pictures.
2) Follow diagram below for wheel
installation:
Blow through one of the lines to ensure
the fuel lines have not become kinked inside the fuel tank compartment. Air should
flow through easily .
You should mark which tube is the vent
and which is the fuel pickup when you
attach fuel tubing to the tubes in the stopper.
Once the tank is installed inside the fuselage,
it may be difficult to determine which is which.
Wheel Collar.
Axle.
Wheel.
Landing Gear.
Nut.
(2) Washer .
3) You have to trim each axle using a tool
cutting and cut-off wheel.
46mm
Caution when cutting the axles and
wear protective goggles.
Plastic tape.
WHEEL INSTALLATION.
Rubber band.
Fuel tank.
2:Fuel pick-up
tube.
3:Fuel fill tube.
1: Vent tube.
1
2
3
1
YAK 54. Instruction Manual
8
(2) Wheel Collar.
Axle.
Wheel.
Nut.
Nut.
(2) Washer .
1) The blind nuts for securing the landing
gear are already mounted inside the fuselage.
2) Using the hardware provided, mount
the main landing gear to the fuselage.
4) A drop of C/A glue on the wheel collar
screws will help keep them from coming lose
during operation.
Repeat the process for the other wheel.
4) Remove the engine. Using an drill bit,
drill the mounting holes through the engine
mount at the four locations marked.
2) Place your engine onto the engine
mount. Adjust the engine is centered of the
edges of the engine case.
3) When you are satisfied with the alignment, mark the locations of the engine
mounting.
1) Install the pushrod housing through the
predrilled hole in the firewall and into the servo
compartment. The pushrod housing should
protrude 1/4" out past the front of the firewall.
Make a Z-Bend 1/4" from one end of the plain
wire pushrod.
MOUNTING THE ENGINE.
INSTALLING THE MAIN LANDING GEAR.
130mm.
4x20mm.
Landing gear.
www.seagullmodels.com
9
5) Bolt the engine to the engine mount using
the four machine screws. Double check that
all the screws are tight before proceeding.
6) Attach the Z-Bend in the pushrod wire to
the throttle arm on the carburetor. Y ou will need
to remove the throttle arm from the car- buretor
to be able to attach the Z-bend. When
complete, re-attach the throttle arm to the carburetor.
COWLING INST ALLA TION.
1) Slide the fiberglass cowl over the engine and line up the back edge of the cowl with
the marks you made on the fuselage then trim
and cut.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
the cowl with the crankshaft of the engine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening. Use the spinner backplate as a guide.
Hold the cowl firmly in place using pieces of
masking tape.
3) Install the muffler and muffler extension
onto the engine and make the cut out in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve. Secure the cowl to fuselage using the 3x10mm screws (4).
Because of the size of the cowl, it may be necessary to use a needle valve extension for the
high speed needle valve. Make this out of sufficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
place by tightening the set screw in the side of
the needle valve.
Pushrod wire.
4x30mm.
4.2mm.
Trim and cut.
YAK 54. Instruction Manual
10
Install the spinner backplate, propeller and
spinner cone.
INSTALLING THE SPINNER.
INSTALLING THE FUSELAGE SERVO.
INSTALLING THE SWITCH.
Install the switch into the precut hole in the
side, in the fuselage.
1) Install the rubber grommets and brass
collets onto the throttle servo. T est fit the servo
into the aileron servo mount.
2) Secure the servos with the screws provided with your radio system.The position
show in picture below:
Because the size of servos differ, you
may need to adjust the size of the precut opening in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
The propeller should not touch any part
of the spinner cone. If it does, use a
sharp modeling knife and carefully trim away
the spinner cone where the propeller comes
in contact with it.
Remove covering.
3x10mm.
Elevator servo.
Rudder
servo.
Elevator servo.
Throttle servo.
www.seagullmodels.com
11
THROTTLE SERVO ARM INSTALLATION.
1) Install adjustable servo connector in
the servo arm as same as picture below:
HORIZONTAL STABILIZER.
1) Using a ruler and a pen, locate the
centerline of the horizontal stabilizer , at the trailing edge, and place a mark. Use a triangle
and extend this mark, from back to front,
across the top of the stabilizer. Also extend
this mark down the back of the trailing edge of
the stabilizer.
2) Using a modeling knife, carefully remove
the covering at mounting slot of horizontal stabilizer ( both side of fuselage).
3) Slide the stabilizer into place in the precut slot in the rear of the fuselage. The stabilizer should be pushed firmly against the front
of the slot.
4) With the stabilizer held firmly in place,
use a pen and draw lines onto the stabilizer
where it and the fuselage sides meet. Do this
on both the right and left sides and top and
bottom of the stabilizer.
5) Remove the stabilizer. Using the lines
you just drew as a guide, carefully remove the
covering from between them using a modeling knife.
Center line.
Adjustable Servo
connector.
Servo arm.
Nut.
Remove covering.
Pen.
Switch.
Throttle.
Remove covering.
YAK 54. Instruction Manual
12
6) Using a modeling knife, carefully remove the covering that overlaps the stabilizer
mounting platform sides in the fuselage. Remove the covering from both the top and the
bottom of the platform sides.
7) When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 Minute Epoxy. Apply a thin layer to the
top and bottom of the stabilizer mounting area
and to the stabilizer mounting platform sides
in the fuselage. Slide the stabilizer in place
and realign. Double check all of your measurements once more before the epoxy cures.
Hold the stabilizer in place with T -pins or masking tape and remove any excess epoxy using
a paper towel and rubbing alcohol.
Remove covering.
2) Slide the vertical stabilizer into the slot
in the top of the fuselage. The rear edge of
the stabilizer should be flush with the rear edge
of the fuselage and the lower rudder hinge
should engage the precut hinge slot in the
lower fuselage. The bottom edge of the stabilizer should also be firmly pushed against the
top of the horizontal stabilizer .
1) Using a modeling knife, remove the
covering from over the precut hinge slot cut
into the lower rear portion of the fuselage. This
slot accepts the lower rudder hinge.
When cutting through the covering to re-
move it, cut with only enough pressure
to only cut through the covering itself. Cutting
into the balsa structure may weaken it.
COVERED WOOD FILLER PIECE
INSTALLATION.
VERTICAL STABILIZER INSTALLATION.
Covered wood
filler piece.
Glued epoxy.
Hinge.
Hinge slot.
www.seagullmodels.com
13
3) While holding the vertical stabilizer
firmly in place, use a pen and draw a line on
each side of the vertical stabilizer where it
meets the top of the fuselage.
4) Remove the stabilizer. Using a mod-
eling knife, remove the covering from below
the lines you drew.
Pen.
5) Slide the vertical stabilizer back in
place. Using a triangle, check to ensure that
the vertical stabilizer is aligned 90º to the horizontal stabilizer.
Set the stabilizer in place and realign. Double
check all of your measurements once more before the epoxy cures. Hold the stabilizer in place
with T-pins or masking tape and remove any
excess epoxy using a paper towel and rubbing
alcohol. Allow the epoxy to fully cure before
proceeding.
6) When you are sure that everything is
aligned correctly , mix up a generous amount of
30 Minute Epoxy . Apply a thin layer to the mounting slot in the top of the fuselage and to the sides
and bottom of the vertical stabilizer mounting
area. Apply epoxy to the bottom and top edges
of the filler block and to the lower hinge also.
When cutting through the covering to re-
move it, cut with only enough pressure to
only cut through the covering itself. Cutting
into the balsa structure may weaken it.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
INSTALLING THE AILERON SERVOS.
Servos.
Small weight.
String.
Remove
covering.
C/A glue.
Rudder.
YAK 54. Instruction Manual
14
Secure the servos with the screws provided with your radio system.
Repeat the procedure for orther wing
haft.
Wing bottom.
String.
Small weight.
Attach the string to the servo lead and
carefully thread it though the wing. Once you
have string the lead throught the wing, remove
the string so it can use for the other servo
lead. T ape the servo lead to the wing to prevent
it from falling back into the wing.
Because the size of servos differ, you
may need to adjust the size of the precut opening in the mount. The notch in the sides of
the mount allow the servo lead to pass through.
Using a small weight (Weighted fuel pick-up
works well) and string, feed the string through
the wing as indicated.
Electric wire.
String.
Plastic tape.
Aileron electric.
Wing.
Pull.
Wing panel
bottom.
String.
Electric wire.
Wing bottom.
String.
Small weight.
www.seagullmodels.com
15
AILERON CONTROL HORN INST ALLATION
Aileron control horn:
Mix a small amount of 30 minute epoxy and
lightly coat the inside of the hole in the aileron
and the control horn screw.
Wing.
Aileron.
drill hole
3.2mm.
Wing bottom.
Wing bottom.
72mm.
C/A glue.
Wing bottom.
Aileron control horn.
Center the servo using the radio system.
Attach the servo arm to the servo using the
screw provided with the servo.
2 sets.
3x40mm.
Wing bottom.
M3 lock nut.
M3 nut.
Aluminium washer.
M3 control horn.
YAK 54. Instruction Manual
16
Repeat the procedure for the other wing.
ELEVATOR - RUDDER CONTROL HORN
INSTALLATION.
3) Install the rudder control horn using the
same method as with the elevator control
horns.
Wing.
Aileron.
2) Elevator and rudder pushrods assembly
follow pictures below.
1) Thread one clevis and M2 lock nut on
to each elevator control rod. Thread the horns
on until they are flush with the ends of the control rods.
ELEVATOR - RUDDER PUSHROD
INSTALLATION.
1) Install the elevator control horn using
the same method as with the aileron control
horns.
2) Position the elevator control horn on
the both side of elevator.
M2 lock nut.
2 sets.
3x35mm.
Right side.
Elevator control horn.
Rudder
control
Elevator
control horn.
Left side.
www.seagullmodels.com
17
M2 lock nut.
Snap keeper.
M2 clevis.
INSTALLING TAIL STRUT SYSTEM.
The tail strut system assembly follow
pictures below.
3x10mm.
Alumium
trap.
42mm.
Throttle.
Rudder.
Elevator.
Alumium trap.
3x10cm(2pcs).
1
Plastic clip.
2
1
Rudder pushrod.
Elevator pushrod.
Turnbuckle.
YAK 54. Instruction Manual
18
3) Secure the tail wheel bracket in place
using two 3x10mm wood screws. Be careful
not to overtighten the screws.
2) Using a pen, mark the locations of the
two mounting screws. Remove the tail wheel
bracket and drill 1mm pilot holes at the locations marked.
1) Plug the six servo leads and the switch
lead into the receiver. Plug the battery pack
lead into the switch also.
2) Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration.
3) Route the antenna in the antenna tube
inside the fuselage and secure it to the bottom of fuselage using a plastic tape.
INSTALLING THE BATTERY-RECEIVER.
See pictures below.
MOUNTING THE CONTROL CLASP.
ATTACHMENT WING-FUSELAGE.
Att ach the aluminium tube into fuselage.
1) Set the tail wheel assembly in place on
the plywood plate. The pivot point of the tail
wheel wire should be even with the rudder
hinge line and the tail wheel bracket should
be on the plywood plate.
MOUNTING THE TAIL WHEEL.
2
Receiver.
Tie wrap.
Antenna.
Control clasp.
2x20mm.
2 screws.
www.seagullmodels.com
19
Insert two wing panels as pictures below.
1) It is critical that your airplane be balanced correctly . Improper balance will cause
your plane to lose control and crash. The cen-
ter of gravity is locate
6.5-7.5cm back from
the leading edge of the wing, measured at wing
tip.
BALANCING.
2) If the nose of the plane falls, the plane
is nose heavy. To correct this first move the
battery pack further back in the fuselage. If
this is not possible or does not correct it, stick
small amounts of lead weight on the fuselage
sides under the horizontal stabilizer . If the tail
of the plane falls, the plane is tail heavy. To
correct this, move the battery and receiver forward orif this is not possible, stick weight onto
the firewall. When balanced correctly , the airplane should sit level or slightly nose down
when you lift it up with your fingers.
2) Turn on the radio system, and with the
trim tabs on the transmitter in neutral, center
the control surfaces by making adjustments
to the clevises or adjustable servo connectors.
The servo arms should be centered also.
1) We highly recommend setting up the
Y AK 54 using the control throws listed at right.
We have listed control throws for both Low
Rate (initial test flying/sport flying) and High
Rate (aerobatic flying).
3) When the elevator, rudder and aileron
control surfaces are centered, use a ruler and
check the amount of the control throw in each
surface. The control throws should be
measured at the widest point of each surface!
CONTROL THROWS.
Wing bolt.
CG=6.5 - 7.5cm.
YAK 54. Instruction Manual
20
FLIGHT PREPARATION.
A) Check the operation and direction of
the elevator, rudder, ailerons and throttle.
B) Plug in your radio system per the
manufacturer's instructions and turn everything on.
4) By moving the position of the adjustable control horn out from the control surface,
you will decrease the amount of throw of that
control surface. Moving the adjustable control horn toward the control surface will increase the amount of throw.
INITIAL FLYING/SPORT FLYING
Do not use the aerobatic settings for
initial test flying or sport flying.
Ailerons: 3/16” up 3/16” down
Elevator: 3/8” up 3/8” down
Rudder: 3/4” right 3/4” left
AEROBATIC FLYING
Ailerons: 3/8” up 3/8” down
Elevator: 7/8” up 7/8”down
Rudder: 1 1/4” right and left
F)From behind the airplane, look at the
aileron on the right wing half. Move the aileron
stick to the right. The right aileron should move
up and the other aileron should move down. If
it does not, flip the servo reversing switch on
your transmitter to change the direction.
PREFLIGHT CHECK.
1) Completely charge your transmitter
and receiver batteries before your first day of
flying.
2) Check every bolt and every glue joint
in the Y AK 54 to ensure that everything is tight
and well bonded.
3) Double check the balance of the airplane. Do this with the fuel tank empty.
4) Check the control surfaces. All should
move in the correct direction and not bind in
any way .
5) If your radio transmitter is equipped
with dual rate switches double check that they
are on the low rate setting for your first few
flights.
6) Check to ensure the control surfaces
are moving the proper amount for both low
and high rate settings.
E)Check the throttle. Moving the throttle
stick forward should open the carburetor barrel. If it does not, flip the servo reversing switch
on your transmitter to change the direction.
D) Check the rudder. Looking from behind the airplane, move the rudder stick to the
right. The rudder should move to the right. If it
does not, flip the servo reversing switch on
your transmitter to change the direction.
C) Check the elevator first. Pull back on
the elevator stick. The elevator halves should
move up. If it they do not, flip the servo reversing switch on your transmitter to change
the direction.
8) Properly balance the propeller . An out
of balance propeller will cause excessive vibration which could lead to engine and/or airframe failure.
We wish you many safe and enjoyable
flights with your YAK 54.
7) Check the receiver antenna. It should
be fully extended and not coiled up inside the
fuselage.
Loading...