Flight Model YAK-55 50CC User manual
CAUTION : this plane is not a toy!
Before use , please carefully read this manual.
●First-time builders should seek advice from people having building
experience in order to assemble the model correctly and to produce its
●Assemble this kit only in places out of children’s reach!
●Take enough safety percautions prior to operating this model.
You are responsible for this model’s assembly and safe operation!
●Always keep this instruction manual ready at hand for quick
reference,even after completing the assembly.
Length:85.5in/2172mm;
performance to full extent .
Radio:6Channel 6Servos;
Flying Weight:7300-7700g;Wing Span:86.6in/2200mm;
Wing Area:94sq.dm;
Engine:50CC Gas
Page1
●Make sure to apply Vaseline to
the rudder hinges to prevent the
epoxy from getting in to the joint.
●Make sure to allow room for
epoxy to penetrate the hinges.
Carefully slide the rudder onto
each hinge and against the trailin
g
edge of the fin.Wipe away excess
epoxy with alcohol wetted wipes.
●Ensure there is no gap
between fin and rudder.
Install the rudder servo in the
fuselage that prepared by factory.
Feed the rudder cable through th
e
cable exit tube in the tail of the
fuse toward the front of the fuse.
Repeat on other side.
Adjust rudder pull-pull cables
to desied tension by screwing in
or out on the threaded couplers
and or ball links.Make all adjust-
ments with the rudder servos still
powered up and centered,and th
e
rudder still taped in the neutral
position.
RUDDER AND TAIL WHEEL
Push
rods
Rudder
servo
Page2
●Ensure the servo doesn't bind
at center or at either end point.
Drill holes in the hardwood tail
wheel mount and install the blind
nut through the opening in the
rear of the fuse.
Install the mounting screw for the
tail wheel.
●Ensure it has been totally
screwed into the blind nuts.
Install the hatch over the opening in the rear of the stabilizer with 4 screw
s
Mount the elevator onto the stab
making sure you use Vaseline in
the hinge points so the glue will
not stick the hinge shut.
Install the control horns in place
for the elevator horn before slidin
g
the stab in place.
Screw the threaded pushrod and
swivel in place onto the elevator
horn.Plug in a 24"servo wire
extension and use a securing clip
provided to make sure they don't
come unplugged in flight.
STABILIZER AND ELEVATOR
A
luminum
steering
Page3
Mount the elevator servo in place
and pull the servo wire extension
up toward the front.
Attach the servo extension wire
using foam wire holding brackes
or zip ties to the formers along
the sides of the fuse so they
can't interfere with the rudder
control cables.
Mount the servo arm on to the
elevator push rod before installin
g
it on the servo so you can tighten
the nylon insert locking nut to the
mounting screw.
Slide the stab on to the alumium
tube and attach to fuse using the
bolts provided.
●Make sure the bolts has been
totally screwed into the blind nuts
.
Page4
Install the servo arm to the servo
after making sure the elevator is
level with the stab with the servo
is in dead center.Tape the
elevator in place using blue
painter's masking tape.
Install the aileron horns in place
with AB glue.Align the holes in th
e
horns .Install the servo after
pulling the servo extention wire
in the wing.Install the servo arm
on the servo and loctitle it in plac
e
on the mount screw.Install the
pushrod and control horn.
●Check for movement and cente
on the servo for the aileron to be
in a level resting position.
●Check to make sure you have
the servos in a reverse manner
so ailerons with work properly.
MAIN WINGS
A
B
Bolt on tabs for
stabs
Page5
Find out the holes in each sides
of fuselage,then remove the
covering.Insert the carbon joiner
in place,then put on wings.
●Check to make sure you have
the carbon in a right length in the
wings.
Mounting the wings with plastic
bolts on both sides.
Gather the wheels,axles and
collars as shown.
Install the main landing gear with
the bolts provided and use blind
nuts already installed and use
blue Loctite on the mounting bolt
s
●Bottom View
MAIN LANDING GEAR
Plastic
bolt
Page6
Permanently tighten the axle to
the gear strut by wrenches.
Install wheel pants with two
mounting bolts.
Wheel pants take a lot of abuse,
mount securely!
The finished photo as shown.
Page7
Measure the length of the engine
from the firewall mounts to the
prop thrust washer for the proper
distance allowing 1/4" to 1/2" fro
m
the dege of the cowl.
Move if needed.
Draw the engine ecnter line and
thrust line darker with a ball point.
Note the 2 degree right thrust buil
t
in to the firewall.
The cowl is already built with this
offset as well.
Use the drill template if you are
going to use a DA 50 or measure
your engines mounting location.
Remember the engine is mounte
d
inverted.
Determine where the throttle arm
push rod is going to the firewall
and drill a hole.If you are going to
use a Nyrod,then make the hole
the same size as the outsider
red tube.
ENGINE
Page8
Install the canister muffler in the
cooling tunnel with a commercial
muffler mount and a support in th
e
front of the muffler made of
plywood using some silicon tubin
g
for insulation form the heat using
glue.
Install the fuel tank mounting
ties under the fuel tank floor.
External fuel pipe
FUEL TAN
K
V
elcro tan
k
straps over foam.
Page9
Install the battery,receiver and
switch in place as shown.
Slide the rubber backed washers
on the hatch mounting bolts and
insert bolts through the hatch
mounting holes and into the fuse
blind nuts.Tighten snugly but do
not over tighten and crush the
hatch or the fuse sides.
CANOPY
Page10
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