Seagull Models MUSTANG P-51 User manual

MUSTANG P-51
Kit features.
• Ready-made—minimalassembly&finishingrequired.
• Ready-coveredcovering.
• Photo-illustratedstep-by-stepAssemblyManual.
MadeinVietnam.
Specifications
Wingspan----------------------------------------60.5in-----------------------153.7cm.
Wing area------------------------------------- 661sq.in------------------ 42.65 sq.dm.
Weight-----------------------------------------5.5-6.2lbs-----------------------2.5-2.8kg.
Length-----------------------------------------------50in--------------------------127cm.
Recommended engine size--------------.40-.46 cu.in------------------ 2-stroke.
.52 cu.in------------------4-stroke.
Radio System required 4 channel with 6 digital servos.
Flying skill level Intermediate/advanced.
Hand-made Almost Ready to Fly R/C Model Aircraft
ASSEMBLY MANUAL

MUSTANG P-51. Instruction Manual.
2
INTRODUCTION.
Thank you for choosing the MUSTANG P-51 ARTF by SEAGULL MODELS. The MUSTANG P-51
wasdesigned with theintermediate/advanced sport flyer in mind.It is a semiscale 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.Flying the MUSTANG P-51 is simply
ajoy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your MUSTANG P-51. 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.
IfyouareinexperiencedwithbasicR/CflightwestronglyrecommendyoucontactyourR/Csupplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
proceduresdesignedtohelp the newpilotonhiswaytosuccessfulR/C flight. Theywillalsobeable
to advise on any insurance and safety regulations that may apply.
ADDITIONAL ITEMS REQUIRED.
.40-.46 cu.in 2-stroke engine.
.52 cu.in 4-stroke engine.
Radio with six servos.
Glow plug to suit engine.
Propeller to suit engine.
Protective foam rubber for radio
system.
Siliconefuel 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.
PARTS LISTING.
FUSELAGE ASSEMBLY
(1) Fuselage.
(1) Canopy hatch.
WING ASSEMBLY
(1) Right wing half with pre-installed
aileron.
(1) Left wing half with pre-installed
aileron.
(1) Plywood dihedral brace.
Tail section assembly
(1) Horizontal stabilizer with pre-
installedelevatorhalves.
(1) Vertical stabilizer with pre-
installed rudder halves.
Some more parts.
HARDWAREPACK
COWLING
Landinggear.....

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NOTE: To avoid scratching your new aero-
planewesuggestthatyoucoveryour
workbench with an old towel. Keep a
couple of jars or bowls handy to hold
the small parts after you open the
bags.
Pleasetrialfitallparts.Makesureyou
have the correct parts and that they
fit and are aligned properly before
gluing! This will ensure proper as-
sembly as the MUSTANG P-51 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
arenottolerantofmanyharshchemi-
cals including the following: paint
thinner, cyano-acrylate glue accel-
erator,cyanoacrylategluede-bonder
andacetone.Donotletthesechemi-
calscome in contact with the colours
onthecoveringandtheplastic parts.

MUSTANG P-51. Instruction Manual.
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4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurfaceshouldlightlycontactthe
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 control surfaces, including the
ailerons, elevators, and rudder, are
prehinged with hinges installed, but the
hinges are not glued in place. It is
imperativethat you properlyadhere the
hingesin place perthe 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 hingefrom the wingpanel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
untiltheT-pinissnug against the aileron.This
will help ensure an equal amount of hinge is
oneithersideof the hinge line whentheaileron
is mounted to the wing panel.
HINGING THE AILERONS.
Note:
The hinge is constructed of a special
material that allows the C/A to wick or
penetrateanddistributethroughoutthe
hinge, securely bonding it to the wood
structureofthe wing paneland aileron.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
3) Slide the aileron on the wing panel 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
shouldbe maintained between thewing panel
andaileron.
5) Turn the wing panel over and deflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge,makingsure thattheC/Apenetratesinto
both the aileron and wing panel.
6) Using C/A remover/debonder and a
papertowel,remove any excess C/Aglue that
may have accumulated on the wing or in the
aileronhinge area.
Hinge.
T-pin.
C/Aglue.
C/Aglue.

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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.
Note:Work the aileron up and down several
times to “work in” the hinges and check
for proper movement.
HINGING THE ELEVATOR.
Repeat the procedure for orther wing
haft.
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.
WING ASSEMBLY.
NOTE:We highly recommend using 30
minute epoxy as it is stronger and
providesmoreworkingtime,allowing
thebuildertoproperlyaligntheparts.
Using fast cure epoxy when joining
the wing halves could result in the
gluedryingbeforethewinghalvesare
aligned properly which may result in
failure of the wing centre section
duringflight.
1) Locatetheplywoodwingdihedralbrace.
Using a ruler, locate its centre and draw a
vertical line .
2) Testfitthedihedralbraceintoeachwing
half. The brace should slide in easily up to the
centreline that you drew. If not, use 220 grit
sandpaper with a sanding block and sand
down the edges and ends of the brace until it
fits properly.
3) Remove the brace when satisfied with
its fit in each wing half. Coat both sides of one
halfofthedihedralbracewith30minuteepoxy.
Next,poursomeepoxyintothedihedralboxin
one wing panel. Make sure you cover the top
andbottomaswellasthesidesofthedihedral
brace. Use enough epoxy to fill any gaps.
Maskingtape.
Centreline.

MUSTANG P-51. Instruction Manual.
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Carefullyslidethetwowing halves together
and firmly press them together, allowing the
excess epoxy to run out. There should not be
any gap in the wing halves. Use rubbing
alcohol and a paper tower to clean up any
excess epoxy.
Expoxy.
INSTALLING THE AILERON SERVOS.
We recommended to use long servos
arm for all servos without throttle servo.
Install the rubber grommets and brass
colletsontotheaileronservo. Test fittheservo
into the aileron servo mount.
Install the servo into the servo tray.
Apply masking tape at the wing join to hold
the wing halves together securely.
4) Peel off the backing from the self adhe-
sivecoveringstrip.Applythestriptothecentre
section of the wing starting from the bottom
trailingedge.Wrapthestripallthewayaround
the wing until it meets the trailing edge again.
Trim off any excess strip.
C/Aglue.
Remove covering.
Servos. Small
weight.
Thread.
Maskingtape.

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Because the size of servos differ, you
mayneedto adjust the sizeof 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
workswell)andthread, feedthe string through
the wing as indicated.
Install the aileron servo tray into the servo
mount.
Repeat the procedure for orther wing
haft.
Attach the string to the servo lead and
carefully thread it though the wing. Once you
havethreadtheleadthroughtthewing, remove
the string so it can use for the other servo
lead.Tapetheservo lead tothewingtoprevent
it from falling back into the wing.
Thread.
Small weight.
Thread.
Small weight.
Thread.
Small weight.
Thread. Wing bottom.
Thread.
Electric wire.

MUSTANG P-51. Instruction Manual.
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Plastic tape.
4) Using a 1mm drill bit and the control
horns as a guide, drill the mounting holes
through the aileron halves.
5) Mountthe control hornsby inserting the
screws through the control horn bases and
aileron halves, then into the mounting
backplates. Do not overtighten the screws or
the backplates may crush the wood.
6)Threadone adjustable controlhorn onto
eachaileron control rod. Thread the horns on
untilthey are flush with the ends of the control
rods.
AILERON LINKAGE.
INSTALLINGTHE AILERONLINKAGE.
1) Using a ruler & pen to draw a straight
line as below picture.
2) Locate the two nylon control horns, two
nyloncontrolhornbackplatesandtwo machine
screws.
ControlHorn.
MountingScrews. Mounting Plate.
3) Position the aileron horn on the bottom
side of aileron. The clevis attachment holes
should be positioned over the hinge line.
2mm x 20 mm.
Pen.
Servo arm.
Straighline.

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Aileron.
Wing pannel.
Repeat the procedure for the other
aileron servo.
MAIN LANDING GEAR
INSTALLATION.
 1)Using a modeling knife,remove the cov-
ering from over the two main gear mounting
slots located in the bottom of the wing. One
slot is located in each wing half.
 2) Insert the 90º bend of one main gear
wire into the predrilled hole in one mounting
slot.
INSTALLING THE MAIN GEAR WIRES.
 3) The landing gear wire is held in place
using two nylon landing gear straps and four
3mm x 10mm wood screws.
Cut.
Pen.
Ailerontorque rod.
Clevis.
3mmx10mm.
Mountingslot.
Remove covering.
M2 lock nut. Snapkeeper.
M2clevis.

MUSTANG P-51. Instruction Manual.
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The straps should be located equal dis-
tance from the inside and outside ends
ofthewire.
Pen.
Landing gear wire.
 4) Using the two landing gear straps as a
guide, mark the locations of the four 3mm x
10mm mounting screws onto the wing sur-
face.
 5) Remove the two straps and the gear
wire. Drill four 1mm pilot holes into the wing
for the wood screws.
Be careful not to drill through the top
of the wing!
 6) Reinstall the gear wire and install the
straps using the four 3mm x 10mm wood
screws. Tighten the screws completely to
secure the gear wire in place.
Repeat the procedure for the other wing
half.
INSTALLING THE MAIN GEAR WHEELS.
1) Slide one wheel collar with 3mm x
6mm set screw onto each axle. Push the
wheel collars on as far as they will go and
tighten the set screws.
Be careful not to overtighten the set
screws. Overtightening may cause the
threads to strip.
2) Slide one 60mm diameter wheel onto
eachaxleandpushthemupagainst the wheel
collars. Slidetheremaining wheel collars with
3mm x 6mm set screws onto the axles. Push
them up against the wheels and tighten the
set screws. The wheels should spin free and
notbindinany way. Iftheydobind,loosenthe
setscrewsintheouterwheelcollarsandmove
the collars out a small amount. Retighten the
set screws.
3mmX10mm.
1mm screw bit.
INSTALLING THE PLASTIC GUN.
See pictures below:

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Repeat the procedure for the other
main gear wheel.
C/Aglue.
Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
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.
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 pickup 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.
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.
2) Usinga modeling knife, cut one length
ofsiliconfuel line. Connect one endofthe line
to the weighted fuel pickup 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.
INSTALLING THE STOPPERASSEMBLY.
FUEL TANK. Venttube. Fuel Pickup
Tube.
FuelFill Tube.
6) When satisfied with the alignment of
thestopperassembly tighten the3mmx20mm
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.

MUSTANG P-51. Instruction Manual.
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Cut.
Blow through the tubes to make sure the
lines have not become kinked during
installation.
INSTALLING THE FUEL TANK.
Attach the silicone fuel and pressure pipes
tothetank.The lower pipe is the‘feed’andthe
uppertwo the ‘pressure andfill’. The fillpipe is
the next pipe.
MOUNTING THE ENGINE.
 1) Install the pushrod housing through the
predrilledholeinthefirewall 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.
Plastic tape.
Pushrod wire.
Pull.
Fueltank.
Venttube.
Fuelfill tube.
Fuel pickup
tube.

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3mm X 25mm.
 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 align-
ment, mark the locations of the engine
mounting.
11.2cm.
 5) Bolttheenginetothe enginemount
using the four machine screws. Double
cheek that all the screws are tight before
proceeding.
 6) AttachtheZ-Bend in thepushrod wire
to the throttle arm on the carburetor. You will
need to remove the throttle arm from the car-
buretor to be able to attach the Z-bend. When
complete, reattach the throttle arm to the car-
buretor.
4) Remove the engine. Using an drill bit,
drill the mounting holes through the engine
mount at the four locations marked.
3x25mm(4pcs).
Pushrod wire.
Pen.
5.5cm.
Remove covering

MUSTANG P-51. Instruction Manual.
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Because of the diameter of the cowl, it
may be necessary to use a needle valve ex-
tensionforthehighspeedneedlevalve. Make
thisout of sufficientlength 1.5mm wireand in-
stall it into the end of the needle valve. Se-
cure the wire in place by tightening the set
screw in the side of the needle valve.
 2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaftof the engine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Usethe spinner backplateasaguide.
Hold the cowl firmly in place using pieces of
masking tape.
3) Slide the cowl back over the engine
andsecure it in place using four 3mm x 10mm
wood screws. See picture below.
4) Installthemufflerand mufflerextension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
andfuel filler valve.
COWLING.
1) Slide the fiberglass cowl over the en-
gineandlineup the back edge of thecowlwith
themarks you madeon the fuselagethen trim
and cut.
3mmX10mm.
Trim and cut.
Trim and cut.

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INSTALLING THE SPINNER.
Needlevalve.
3mmX10mm.
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.
 1) Install the spinner backplate, propeller
andspinner cone. The spinner cone is held in
place using two 3mm x 15mm wood screws.
(spinner is not included).
Some switches come with a hole drilled
through the switch tab for this very purpose.
Ifyourswitch does not, removetheswitch and
drill a 3/32” hole through the middle of the
switchtab.
 2) Using a 3/32” drill bit, drill a hole through
the side of the fuselage, opposite the muffler,
even with the switch.
 3)Makeapush-pull lever out ofscrap wire.
Attach the wire to the switch lever and route
the wire out the side of the fuselage, through
thehole youdrilled.
INSTALLING THE SWITCH.
 1) Install the switch into the precut hole in
the servo tray, in the fuselage, from the bot-
tom. Use the two screws provided with the
switch to secure it in place. Drill two 3/32”
holes through the tray for the screws to pass
through.
3/32” Hole.
 4 ) Install the rubber grommets and brass
collets onto the elevator, rudder and throttle
servos. Test fit the servosinto the preinstalled
servo tray. Because the size of servos dif-
fer, you may need to adjust the size of the
precut openings in the tray.
 5) Position the servos into the servo tray
with the output shafts orientated as shown
below. Drill 1/16” pilot holes through the tray
for each of the mounting screws.
Glueattached.

MUSTANG P-51. Instruction Manual.
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INSTALLING THE FUSELAGE SERVOS.
Switch.
Center line.
HORIZONTALSTABILIZER.
2)Usingamodelingknife,carefullyremove
thecoveringat mounting slot of horizontalsta-
bilizer ( both side of fuselage).
 1) Using a ruler and a pen, locate the
centerlineof thehorizontalstabilizer,at thetrail-
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
thismark down theback of the trailing edgeof
the stabilizer.
 3) Slidethe stabilizerintoplaceinthe pre-
cut slot in the rear of the fuselage. The stabi-
lizer 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.
Install servos arm to servos. Notice the
position of the servos arm on the servos. See
picture below.
Switch.
Throttle.
Elevator.
Rudder.
Elevator.
Remove covering.
Remove covering.

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 5) Removethe stabilizer. Usingthe lines
youjust drew asa guide, carefullyremove the
covering from between them using a model-
ingknife.
Pen.
Removecovering.
When cutting through the covering to re-
moveit, cut with only enough pressure to only
cut through the covering itself. Cutting into
the balsa structure may weaken it.
 6) 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.
 8) 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.
2) Slidethe vertical stabilizerinto the slot
of the fuselage. The bottom edge of the stabi-
lizer should also be firmly pushed against the
top of the horizontal stabilizer.
VERTICAL STABILIZER
INSTALLATION.
1)Usinga modelingknife,carefullyremove
the covering from over the precut hinge slot
cut into the lower rear portion of the fuselage.
This slot accepts the lower rudder hinge.
 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
topand bottom of thestabilizer mounting area
and to the stabilizer mounting platform sides
in the fuselage. Slide the stabilizer in place
and realign. Double check all of your mea
surementsoncemorebefore the epoxy cures.
HoldthestabilizerinplacewithT-pinsor mask-
ing tape and remove any excess epoxy using
a paper towel and rubbing alcohol.
Hinge.
Hingeslot.

MUSTANG P-51. Instruction Manual.
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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.
When cutting through the covering to re-
moveit, cut with only enough pressure to only
cut through the covering itself. Cutting into
the balsa structure may weaken it.
5) Slide the vertical stabilizer back in
place. Using a triangle, check to ensure that
thevertical stabilizer isaligned 90º tothe hori-
zontal stabilizer.
90º Vertical
Stabilizer.
Horizontal
Stabilizer.
7)Turnthefuselage panel over and deflect
the vertical stabilizer in the opposite direction
from the opposite side.Apply thin C/Aglue to
hinge,makingsure thattheC/Apenetratesinto
thevertical stabilizer and fuselage panel.
8) Using C/A remover/debonder and a
papertowel,remove any excess C/Aglue that
may have accumulated on the fuselage or in
the vertical stabilizer hinge area.
Work the rudder left and right several
times to “work in” the hinges and check for
proper movement.
6) When you are sure that everything is
alignedcorrectly, mix upagenerousamountof
30MinuteEpoxy. Applyathinlayertothemount-
ingslotinthetopofthefuselageandtothesides
and bottom of the vertical stabilizer mounting
area. Applyepoxy tothebottomandtop edges
of the filler block and to the lower hinge also.
Set the stabilizer in place and realign. Double
checkallof yourmeasurementsoncemorebe-
foretheepoxycures.Holdthestabilizerinplace
with T-pins or masking tape and remove any
excess epoxyusing a paper toweland rubbing
alcohol. Allowtheepoxytofullycurebeforepro-
ceeding.
4) Remove the stabilizer. Using a mod-
eling knife, remove the covering from below
the lines you drew. Also remove the covering
from the bottom edge of the stabilizer and the
bottomandtopedgesofthefiller block. Leave
the covering in place on the sides of the filler
block.
Pen.
Remove covering.
Epoxyglue.

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Elevator control horn.
Rudder control horn.
Rudder control horn.
Elevator control horn.
CONTROL HORN INSTALLATION.
 1) Locate the two nylon control horns, two
nylon control horn backplates and four
machine screws.
 2) Position the elevator horn on the both
sideof elevator.The clevisattach-mentholes
should be positioned over the hinge line.
ControlHorn.
MountingScrews. Mounting Plate.
 3) Using a 1.5mm drill bit and the control
horns as a guide, drill the mounting holes
through the elevator halves.
4) Mount the control horns by inserting the
bolts through the control horn bases and
elevator halves, then into the mounting
backplates. Do not overtighten the nuts or the
backplates may crush the wood.
5) Position the rudder control horn on the
leftsideof the airplane.Mountthecontrolhorn
parallel with the horizontal stabilizer.
2mmX20mm.
Cut.
Cut.
Sanding.

MUSTANG P-51. Instruction Manual.
20
 3) One at a time, hold the pushrods in po-
sition over the respective servos to check for
proper servo direction. If any servo turns in
the wrong direction, switch your radio’s re-
versingswitchesas necessary to achievethe
correct direction.
 3) Secure the tail wheel bracket in place
using two 3mm x 12mm wood screws. Be
careful not to overtighten the screws.
 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 centered on the plywood plate.
 2) Using a pen, mark the locations of the
two mounting screws. Remove the tail wheel
bracket and drill 1mm pilot holes at the loca-
tions marked.
MOUNTING THE TAIL WHEEL BRACKET.
 1)Elevatorand rudder pushrods assembly
follow pictures below.
 2) Connect the elevator and rudder servos
to your radio’s receiver and turn on the sys-
tem. Set the trim tabs on the transmitter to
neutraland center the servo arms. The eleva-
tor and rudder servo arms should be perpen-
dicular to the servos.
ELEVATOR-RUDDER PUSHROD INSTALLATION.
Control horn.
Pushrod.
M2lock nut.
3mmX12mm.
Elevator.
Rudder.
Throttle.
Switch.
Elevator.