Seagull Models Shoestring SEA143 User manual

“Graphics and specifications may change without notice”.
ASSEMBLY MANUAL
MS: 143
Specifications:
Wingspan-----------------------------63in(160cm).
Wingarea---------------722.3sq.in(46.6sqdm).
Weight----------------------8.8-9.7lbs(4.0-4.4kg).
Length-----------------------------54.5in(138.5cm).
Engine -------------0.61-0.75cu.in-----2-stroke.
0.91-1.25cu.in -----4-stroke.
Radio----------4channelswith5digitalservos.
Electricconversion:optional.

SHOETRING. Instruction Manual
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INTRODUCTION.
Thank you for choosing the SHOETRING ARTF by SEAGULL MODELS COMPANY LTD. The
SHOETRING was designed with the intermediate/advanced sport scale in mind. It is a semi scale
airplane whichiseasytoflyandquick toassemble.Theairframeisconventionallybuiltusingbalsa,
plywood tomakeitstrongerthantheaverageARTF,yetthedesignallowstheaeroplanetobekept
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 SHOETRING 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 SHOETRING. 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
supplierandjoinyourlocalR/CModelFlyingClub.R/CModelFlyingClubsofferavarietyoftraining
proceduresdesigned tohelpthenewpilot onhisway tosuccessfulR/Cflight.They willalsobeable
to advise on any insurance and safety regulations that may apply.
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KIT CONTENTS
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ADDITIONAL ITEMS REQUIRED.
0.61-0.75 cu.in 2-stroke
0.91-1.25 cu.in 4-stroke
Radio System required 4 channels
with 5 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
Modellingknife
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
KIT CONTENTS
SEA14301 Fuselage
SEA14302 Wing set
SEA14303 Tail set
SEA14304 Fiberglass cowl
SEA14305 Landing gear
SEA14306 Canopy
SEA14307 Pilot
SEA14308 Fiberglass whl pants
SEA14309 Wheel
SEA14310 Aluminum wing tube
SEA14311 Engine mount
SEA14312 Fuel tank
SEA14313 Spinner
SEA14314 EP conversion pack
SEA14315 Hardware bag
2)Removeeach hinge fromthewing 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
ofhingeis oneithersideof thehingelinewhen
the aileron is mounted to the aileron.
The control surfaces, including the
ailerons, elevators, and rudder, are
prehinged with hinges installed, but the
hinges are not glued in place. It is
imperativethatyouproperlyadherethe
hingesinplaceperthestepsthatfollow
using a high-quality thin C/A glue.
Note:
HINGING THE AILERONS.
Hinge.
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.Agap of 1/64” or less
shouldbemaintainedbetweenthe wing panel
andaileron.
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.
T-pin.

SHOETRING. Instruction Manual
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HINGING THE ELEVATOR.
8)Afterboth 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.
Glue the elevator hinges in place using the
same techniques used to hinge the ailerons.
Work the aileron up and down several
times to “work in” the hinges and check
for proper movement.
Note:
4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurface shouldlightlycontactthe
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: The hinge is constructed of a special
material that allows the C/A to wick or
penetrateanddistribute throughoutthe
hinge, securely bonding it to the wood
structureofthewing panel and aileron.
5)Turn the wing paneloveranddeflectthe
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge,making surethattheC/Apenetratesinto
both the aileron and wing panel.
6) Using C/A remover/debonder and a
papertowel,removeany excess C/A gluethat
may have accumulated on the wing or in the
aileronhingearea.
Hinge.

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HINGING THE RUDDER.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.
INSTALL AILERON CONTROL HORN.
Hinge.
INSTALL ELEVATOR CONTROL HORN.
Aileroncontrolhorn.
Epoxy.
Epoxy.
Elevator control horn.
Epoxy.
Epoxy.
INSTALL RUDDER CONTROL HORN.
Fiberglass control horn.
Fiberglass control horn.
Fiberglass control horn.

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1) Locate the items necessary to install the
engine mount included with your model. .
ENGINE MOUNT INSTALLATION.
4x30mm.
2) Usefour4x30mm head boltsandfour 4mm
washers to attach the engine mount rails to
thefirewall.Tighten thescrews. Make sure to
use threadlock on the screws to help prevent
them from vibrating loose.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
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.
INSTALLING THE STOPPERASSEMBLY.
Thread locker glue.
2) Usingamodelingknife,cutone length
ofsiliconfuelline. Connect one endoftheline
totheweightedfuelpickup and the other end
to the nylon pick up tube.(The silicon tube is
not included).
A
B
Ruddercontrolhorn.
Epoxy.
Epoxy.

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Venttube. Fuel pick up tube.
Fuel fill 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.
Important: When the stopper assembly is in-
stalled 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.
Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
therear 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 ex-
pands and seals the tank opening. Do not
overtighten the assembly as this could cause
the tank to split.
FUEL TANK INSTALLATION.
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.
 7) Slide the fuel tank into the fuselage.
Guide the lines from the tank through the hole
in the firewall.
Fueltank.
A
Fueltank.
C/Aglue.
 8) Use balsa stick to help prevent moveable
from transferring to the fuel tank.
A
B
Fuel pick-up tube. Fuelfilltube.
Venttube.
 9) Connect the lines from the tank to the
engine and muffler. The vent line will connect
to the muffler and the line from the clunk to the
carburetor.
M4x15mm.

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1) Locate the items neccessary to install
thewheelandwheelpants to the landing gear
as shown.
WHEEL AND WHEEL PANTS
INSTALLATION.
2) Follow diagram below for wheel pant
installation:
Use a drill and 4.2mm drill bit to drill a hole in
the wheel pants.
8mm.
14mm.
3) You have to trim each axle using a tool
cutting and cut-off wheel.
Caution when cutting the axles and
wear protective goggles.
wheel collar.
wheel.
Axle.
Washer. M3.
wheel Pant.
wheel.
M3.
M3.
wheel collar.
nut. Axle.
Washer.
M3.
Drill a hole.
4) Slidethecollar to theaxleandsetscrew
the collars to secure the collar to the axle and
thensliderthewheel on the axle withadropof
oilontheaxle sothe wheelwillspinfreelywhen
installed. Prepare a second collar and tighten
the setscrew using hex wrench to secure the
collar to the axle.
5) Place the wheel assembly in the wheel
pants. The threaded portion of the axle will fit
the notch of the wheel pant as shown.
6) Slide the threaded end of the axle
through the hole in the bottom of the landing
gear leg. Use a washer and locknut to tighten
the axle to the landing gear. Make sure to use
threadlock on the nut so it won’t vibrate loose
in flight as shown.
Pushrodwire.
Blow through one of the lines to ensure
thefuellines have not become kinked in-
side the fuel tank compartment. Air should
flowthrougheasily.

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C/Aglue.
LandingGear. wheel Pant. INSTALLING THE MAIN LANDING GEAR
TO FUSELAGE.
Lockerglue.
 8) The blind nuts for securing the landing
geararealreadymounted inside the fuselage.
 9) Using the hardware provided, mount
the main landing gear to the fuselage.
 7) Tighten the setcrews using a hex
wrench to secure the collars on the axle over
the flat spot to retain the wheel as shown.
Repeat steps as above to attach remain-
ing wheel pants to the landing gear.
 10) Place the fuselage inverted on the
workbenchinasuitable stand. Set thelanding
gear in place and use a screwdrive to secure
the landing gear to the fuselage using bolts
M4x20mmandwashers. Make suretouse the
threadlock on the bolts so they don’t vibrate
loose.
Lockerglue.
M4 x 20mm.
Servos. Smallweight.
Thread.
INSTALLING THEAILERON.

SHOETRING. Instruction Manual
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String.
Small weight.
1) Usingasmallweight(Weightedfuel pick-up
workswell) and string, feed thestring through
the wing as indicated.
2) Place the servo between the mounting
blocksand spaceit fromthehatch.Useapencil
to mark the mounting hole locations on the
blocks.
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/Ato cure without
using accelerator.
5) Use dental floss to secure the connection
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.
8) A string has been provided in the wing to
pull the aileron lead through to the wing root.
Remove the string from the wing at the servo
location and use the tape to attach it to the
servoextensionlead.Pull the leadthroughthe
wing and remove the string.
Because the size of servos differ, you
mayneed toadjustthesizeoftheprecut open-
ing in the mount. The notch in the sides of
themountallowtheservoleadtopassthrough.

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9) Set the aileron hatch in place and use a
Phillips screw driver to install it with four wood
screws.
INSTALLING THE FUSELAGE SERVO.
1) Installtherubbergrommetsandbrass
colletsonto thethrottleservo. Testfitthe servo
into the aileron servo mount.
 2) Secure the servos with the screws pro-
vided with your radio system.
Because the size of servos differ, you
mayneedtoadjustthesize oftheprecut open-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
Rudderservo.
Elevatorservo.

SHOETRING. Instruction Manual
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MOUNTING THE ENGINE.
2) Use a pin drill and 3.5mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
 1) Positiontheenginewith thedrive washer
(135mm) forward of the firewall as shown.
+ ENGINE .61 - .75 : 2 STROKE.
4.2mm diameter.
3) Use a drill to drill the four holes in the engine
mount rails.
3.5mm.
THROTTLE SERVO ARM INSTALLATION.
Installadjustableservoconnectorinthe servo
arm as same as picture below:
AdjustableServo
connector.
Servoarm.
Loctite secure.
1PCS.
Elevatorservoarm.
Rudderservoarm.
Throttleservoarm.
Switch.
Installtheswitchinto the precut holeinthe
side of fuselage.
INSTALLING THE SWITCH.
Trimand cut.
135mm.

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4) On the fire wall has the location for the
throttle pusshrod tube (pre-drill).
MachineScrewM4x30mm.
Pushrodwire.
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four 4x30mm machine screws to secure the
engine to the mount as shown.
5) Slide the pushrod tube in the firewall and
guide it through the fuel tank mount. Use
medium C/A to glue the tube to the firewall and
the fuel tank mount.
6) Connect the Z-bend in the 500mm throttle
pushrod to the outer hole of the carburetor arm.
8) Reinstall the servo horn by sliding the
connector over the pushrod wire. Center the
throttle stick and trim and install the servo horn
perpendicular to the servo center line.
9) Move the throttle stick to the closed position
and move the carburetor to closed. Use a 2.5mm
hex wrench to tighten the screw that secures
the throttle pushrod wire. Make sure to use
threadlock on the screw so it does not vibrate
loose.
Screw.
2) Use a pin drill and 3.5mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
135mm.
 1) Positiontheenginewiththedrivewasher
(115mm) forward of the firewall as shown.
+ ENGINE .91 - 1.00 : 4 STROKE.

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Pushrodwire.
MachineScrewM3x40mm.
8) Reinstall the servo horn by sliding the
connector over the pushrod wire. Center the
throttle stick and trim and install the servo horn
perpendicular to the servo center line.
9) Move the throttle stick to the closed position
and move the carburetor to closed. Use a 2.5mm
hex wrench to tighten the screw that secures
the throttle pushrod wire. Make sure to use
threadlock on the screw so it does not vibrate
loose.
4.2mm diameter.
4) On the fire wall has the location for the
throttle pusshrod tube (pre-drill).
3) Use a drill to drill the four holes in the engine
mount rails.
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four 3x40mm machine screws to secure the
engine to the mount as shown.
5) Slide the pushrod tube in the firewall and
guide it through the fuel tank mount. Use
medium C/A to glue the tube to the firewall and
the fuel tank mount.
6) Connect the Z-bend in the 500mm throttle
pushrod to the outer hole of the carburetor arm.
3.5mm.

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COWLING INSTALLATION.
Trim and cut.
1) Slide the fiberglass cowl over the
engine and line up the back edge of the cowl
withthemarksyou made on the fuselagethen
trim and cut as shown.
Trim and cut.
Trim and cut.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowl withthecrankshaft oftheengine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Use thespinnerbackplateasa guide.
Hold the cowl firmly in place using pieces of
masking tape.
Becauseofthesize of the cowl, itmaybenec-
essarytouseaneedlevalveextension for the
highspeedneedle valve. Make this outofsuf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placebytighteningthesetscrew in the side of
the needle valve.
 3) Install themufflerandmufflerextension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve. Secure the cowl to fuse-
lage using the 3x10mm screws to tighten the
screws.
Needlevalve.

SHOETRING. Instruction Manual
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3) Attach the motor to the front of the electric
motor box using four 4mm blind nut, four
M4x20mm hex head bolts to secure the motor.
Please see picture shown.
4mm.
ELECTRIC POWER CONVERSION.
1) Locate the items neccessary to install the
electric power conversion parts included with
your model.
2) Attach the electric motor box to the firewall
suitable with the cross lines drawn on the electric
motor box and firewall. Using epoxy and balsa
stick to secure the motor box to the firewall.
Please see pictures below.
- Model size: .61-.75 size models
- Motor: 50mm 310 rev per volt
- Propeller: 13x10 ~ 14x10
- ESC: 60A
- Lipo Batteries: 8 cell 3200mA
MachineScrew M3x10mm
Recommendation EP parts as shown (not
included with your model)
Epoxy.

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Blindnut.
M4x15mm.
135mm.
Electricmotor.
Epoxy.
Epoxy.
4) Locate the plywood battery tray to the
fuselage. Tighten the screws using machine
screws M3x15mm to secure the tray in position.
5) Attach the speed control to the side of the
motor box using two-sided tape and tie wraps.
Connect the appropriate leads from the speed
control to the motor. Make sure the leads will
not interfere with the operation of the motor.
Battery.
M4x15mm.
Balsa sticks.
SPINNER INSTALLATION.
Install the spinner backplate, propeller and
spinner cone.
Speed control.
4mm.

SHOETRING. Instruction Manual
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Wing. M2lock nut.
Aileron.
INSTALLING THE HORIZONTAL
STABILIZER. Draw center line.
1) Using a ruler and a pen, locate the
centerlineofthehorizontalstabilizer,atthetrail-
ing edge, and place a mark. Use a triangle
and extend this mark, from back to front,
across the top of the stabilizer. Also extend
thismarkdownthebackofthetrailingedge of
the stabilizer.
2) Using a modeling knife, carefully re-
movethecovering at mountingslotofhorizon-
tal stabilizer ( both side of fuselage).
Flap.
Flap.
Wing.Wing.
Repeat the procedure for the other aileron servo.
AILERONPUSHRODHORNINSTALLATION
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.
M3 lock nut.
M3clevis.
70mm.
100mm.

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Remove covering.
3) Put the stabilizer into place in the po-
sition of the fuselage.
5) When you are satisfied with the align-
ment, hold the stabilizer in place with T- pins
or masking tape, but do not glue at this time.
4) Install the stabilizer onto the fuselage.
Align the centerline drawn on the top and the
rear of the stabilizer with the centre of the fu-
selage. When that is aligned, hold the stabi-
lizer in that position using T-pins or masking
tape. Align the horizontal stabilizer with the
wing. When viewed from the rear, the hori-
zontal stabilizer should be level with the wing.
Ifitisnot level, use sandpaperandsanddown
the high side of the stabilizer mounting plat-
form until the proper alignment is achieved.
The tips of the stabilizer should also be equal
distance from the tips of the wing.
6) 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.
Hingeslot.
Remove covering.
8) Using a modeling knife, carefully re-
move the covering that overlaps the stabilizer
mounting platform sides in the fuselage. Re-
move the covering from both the top and the
bottom of the platform sides.
When cutting through the covering to re-
move it, cut with only enough pressure
toonlycut through the covering itself. Cutting
into the balsa structure may weaken it.
Pen.
7) Removethestabilizer. Usingthelines
youjustdrewasaguide,carefullyremove the
covering from between them using a model-
ingknife.
Epoxy.
9) When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 Minute Epoxy. Apply a thin layer to the
bottom of the stabilizer mounting area and to
the stabilizer mounting platform sides in the
fuselage. Putting the stabilizer in place and
realign. Double check all of your measure-
ments once more before the epoxy cures.
Holdthe stabilizerinplacewithT-pins ormask-
ing tape and remove any excess epoxy using
a paper towel and rubbing alcohol.

SHOETRING. Instruction Manual
20
Remove covering.
Epoxy.
INSTALLING THEVERTICALSTABILIZER.
1) Using a modeling knife, remove the
covering from over the precut hinge slot cut
into the lower rear portion of the tail at the fu-
selage.
C/Aglue. Hinge.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
3) Slide the vertical stabilizer back in
place. Using a triangle, check to ensure that
theverticalstabilizerisaligned90º to the hori-
zontal stabilizer.
2) 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) When you are sure that everything is
alignedcorrectly,mixup agenerousamount of
Flash30MinuteEpoxy. Apply athinlayertothe
mounting slot and to bottom of the vertical sta-
bilizer mounting area. Apply epoxy to the bot-
tomandtopedgesofthe filler block and to the
lower hinge also. Set the stabilizer in place
andrealign. Double checkallofyourmeasure-
mentsonce morebeforetheepoxycures. Hold
the stabilizer in place with T-pins or masking
tape and remove any excess epoxy using a
papertowel and rubbingalcohol. Allowtheep-
oxy to fully cure before proceeding.
10) After the epoxy has fully cured, re-
move the masking tape orT-pins used to hold
the stabilizer in place. Carefully inspect the
glue joints. Use more epoxy to fill in any gaps
that may exist that were not filled previously
and clean up the excess using a paper towel
and rubbing alcohol.
Epoxy.