Seagull Models YAKOVLEV YAK 3 User manual
1
ASSEMBLY MANUAL
Specications:
Wingspan---------------63.0 in (160 cm).
Wing area---------------723.9 sq.in ( 46.7sq.dm).
Weight-------------------11.5 lbs ( 5.2 kg).
Length-------------------55.4 in (140.6 cm).
Engine-------------------20cc
Radio--------------------7 channels with 7 servos.
“ Graphics and specications may change without notice ”.
YAKOVLEV YAK 3
- 63 inch
Code: SEA270
YAK 3 Instruction Manual.
2
ank you for choosing the YAK 3 ARF by SG MODELS. e YAK 3 was designed with
the intermediate/advanced sport yer in mind. It is a semi scale airplane which is easy to y
and quick to assemble. e airframe is conventionally built using balsa, plywood to make it
stronger than the average ARF, yet the design allows the aeroplane to be kept light. You will
nd that most of the work has been done for you already. e motor mount has been tted and
the hinges are pre-installed. Flying the YAK 3 is simply a joy.
is instruction manual is designed to help you build a great ying aeroplane. Please read
this manual throughly before starting assembly of your YAK 3 . Use the parts listing below to
indentify all parts.
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 & REPONSIBILITY.
If you are inexperienced with basic R/C ight we strongly recommend you contact your R/C
supplier and join your local R/C model Flying Club. R/C Model Flying Clubs oer a variety of
training procedures designed to help the new pilot on his way to successful R/C ight. ey
will also be able to advise on any insurance and safety regulations that may apply.
INTRODUCTION.
WARNING.
KIT CONTENTS.
1
5
2
33
2
4
6
3
KIT CONTENTS.
SEA270 YAK 3
1. Fuselage
2. Wing set
3. Tail set
4. Canopy
5. Cowling
6. Pilot
ADDITIONAL ITEMS REQUIRED.
TOOLS & SUPPLIES NEEDED.
HINGING THE FLAP.
.
�20cc gasoline engine.
�Computer radio with 9 servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
in cyanoacrylate glue.
Medium 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.
read-lock.
Paper towels.
2x10mm.
YAK 3 Instruction Manual.
4
HINGING THE AILERON.
Note : e control surfaces, including the ai-
lerons, elevators, and rudder, are prehinged
with hinges installed, but the hinges are not
glued in place. It is imperative that you prop-
erly adhere the hinges in place per the steps
that follow using a high-quality thin C/A glue.
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. is will help ensure an equal amount
of hinge is on either side of the hinge line
when the aileron is mounted to the aileron.
3) Slide the wing panel on the aileron until
there is only a slight gap. e hinge is now
centered on the wing panel and aileron. Re-
move 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.
Hinge.
4) Deect the aileron and completely satu-
rate each hinge with thin C/A glue. e ailer-
ons front surface should lightly contact the
wing during this procedure. Ideally, when
the 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 : e hinge is constructed of a spe-
cial 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.
in CA.
5) Turn the wing panel over and deect 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.
6) Using C/A remover/debonder and a pa-
per towel, remove any excess C/A glue that
may have accumulated on the wing or in the
aileron hinge area.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
5
8) Aer both ailerons are securely hinged,
rmly grasp the wing panel and aileron to
make sure the hinges are securely glued and
cannot be pulled out. Do this by carefully ap-
plying medium pressure, trying to separate
the aileron from the wing panel. Use caution
not to crush the wing structure.
Work the aileron up and down sev-
eral times to “work in” the hinges
and check for proper movement.
Note :
INSTALL THE AILERONS
CONTROL HORN.
Fiberglass control horn
Fiberglass control horn
Epoxy.
Epoxy.
Aileron control horn.
INSTALL FLAP CONTROL HORN.
Install the ap control horn using the
same method as same as the aileron con-
trol horns.
Epoxy.
Flap control horn.
YAK 3 Instruction Manual.
6
WING ASSEMBLY.
Please see below pictures.
Attach the aluminum tube into wing.
INSTALLING THE AILERON SERVOS.
Because the size of servos dier, you
may need to adjust the size of the precut
opening in the mount. e notch in the
sides of the mount allow the servo lead to
pass through.
Note : to be convenience for trans-
ports ,you don’t need to do this steps.
1) Using a small weight (Weighted fuel
pick-up works well) and string, feed the
string through the wing as indicated.
2) Place the servo between the mounting
blocks and space it from the hatch. Use a
pencil to mark the mounting hole loca-
tions on the blocks.
7
3) Use drill bit in a pin vise to drill the
mouting holes in the blocks.
4) Apply 2-3 drops of thin C/A to each
of the mounting holes. Allow the C/A to
cure without using accelerator.
C/A glue.
5) Use dental oss to secure the connec-
tion so they cannot become unplugged.
6) Secure the servo to the aileron hatch
using Phillips screwdriver and the screws
provided with the servo.
7) Apply 1-2 drops of thin C/A to each of
the mounting tabs. Allow the C/A to cure
without using accelerator.
C/A glue.
8) Remove the string from the wing at
the servo location and use the tape to at-
tach it to the servo extension lead. Pull
the lead through the wing and remove
YAK 3 Instruction Manual.
8
.
9) Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
2x10mm.
INSTALLING THE FLAP SERVO.
Repeat the procedure for the ap servo.
AILERON PUSHROD
INSTALLATION.
Please see below pictures.
Use a felt tip pen to mark the wire where
it crosses the hole. Use a pair of pliers to
put a shrp 90-degree bend in the wire at
the mark.
Mark.
9
.
Bend at the mark
8mm
M2 lock nut.
Metal clevis.
Snap keeper.
Snap keeper.
Servo arm.
Fuel tubing.
Hex Nut.
Nylon Snap keeper.
INSTALLING THE FLAP PUSHROD.
LIGHT COVER.
Repeat the procedure for the aileron
pushrod.
INSTALLING RETRACTABLE
LANDING GEAR.
Locate items necessary to install Sprin
Landing Gear.
You use this fork set JP ER-120-80degree.
YAK 3 Instruction Manual.
10
3x20mm.
This manual suits for next models
1
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