Seagull Models MXS-R User manual

MS:128
“Graphics and specifications may change without notice”.
ASSEMBLY MANUAL
Specifications:
Wingspan----------------------------65.4in(166cm).
Wingarea-----------------767.3sq.in(49.5sqdm).
Weight----------------------9.3-10.6lbs(4.2-4.8kg).
Length------------------------------55.8in(141.8cm).
Engine ------------------0.91-1.2cu.in----2-stroke.
1.00-1.25cu.in ----4-stroke.
Electricconversion: optional
Radio-----------6 channelswith5digital servos.
SIZE: 91-120

MXS-R.Instruction Manual.
2
INTRODUCTION.
ThankyouforchoosingtheMXS-RARTFbySEAGULLMODELS.The MXS-R wasdesignedwith
the intermediate/advanced sport flyer in mind. It is a semi scale airplane which is easy to fly and
quicktoassemble.Theairframeisconventionallybuiltusingbalsa,plywoodtomakeitstrongerthan
theaverageARTF,yetthedesignallowstheaeroplanetobekeptlight.Youwillfindthatmostofthe
workhasbeendoneforyoualready.Themotormounthasbeenfittedandthehingesarepre-installed
. Flying the MXS-R 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 MXS-R . 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
proceduresdesignedto help thenewpilotonhiswaytosuccessful R/C flight.Theywillalsobeable
to advise on any insurance and safety regulations that may apply.
KIT CONTENTS
1
2
9
34
55
8
6
7
10
12 11

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ADDITIONAL ITEMS REQUIRED.
0.91-1.2 2-stroke.
1.00-1.25 4-stroke.
Computer radio with 5 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.
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.
2)Removeeachhingefromthe wing panel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
untiltheT-pinis snug againstthe aileron.This
will help ensure an equal amount of hinge is
oneithersideof the hinge linewhentheaileron
is mounted to the wing panel.
HINGING THE AILERONS .
Note:
Hinge.
T-pin.
KIT CONTENTS.
1 Fuselage
2 Canopy
3 Left wing panel
4 Right wing panel
5 Tail set
6 Aluminum wing tube
7 Scale pilot
8 Fiberglass cowl
9 Wheel pants (2)
10 Main landing gear
11 EP conversion pack
12 Hardware bag included
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
shouldbemaintained between thewing panel
andaileron.
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.

MXS-R.Instruction Manual.
4
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.
Workthe aileron upanddown 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
aileronsfrontsurfaceshouldlightlycontactthe
wing during this procedure. Ideally, when the
Thehingeis 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:
Hinge.
6) Using C/A remover/debonder and a
papertowel,remove any excess C/Agluethat
may have accumulated on the wing or in the
aileronhinge area.
5)Turnthe wing paneloverand 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.

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HINGING THE RUDDER.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.
INSTALL THE AILERONS CONTROL
HORN.
Hinge.
2 sets.
3x35mm.
HINGING THE ELEVATOR.
Glue the elevator hinges in place using the
same techniques used to hinge the ailerons.
C/Aglue.
1) Locate the hardware necessary to install
the control horns for the ailerons.
2) Position the control horn on the bottom of
the aileron. You will see pre-drill hole 6mm for
the horn mounting screw on the aileron.
3) Place epoxy into hole. This will harden the
threads and prevent the crews from pulling
loose.
4) Thread a control horn end with aluminum
washer, lock nut until the top edge of the end is
9mm from the vase of the horn as shown.
6mm.
6mm.

MXS-R.Instruction Manual.
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Install the elevator control horn using the
samemethod assame as theaileron control
horns.
INSTALL ELEVATOR CONTROL HORN.
Repeatsteps to install the ruddercontrol horn
as same as steps done for ailerons.
Elevator control horn.
6mm.
INSTALL RUDDER CONTROL HORN.
2 sets.
3x35mm.
1 sets.
3x35mm.
Aileroncontrolhorn.
6mm.

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6mm.
Ruddercontrolhorn.
ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install the
engine mount included with your model. .
2) Use four M4x30mm head bolts and four
4mmwasherstoattach the engine mountrails
tothe firewall. Tightenthescrews . Make sure
to use threadlock on the screws to help
prevent them from vibrating loose.
M4x30mm.
+ 0.91: 2 STROKE.
Blindnut.
6mm.

MXS-R.Instruction Manual.
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+ 1.20 : 2 STROKE + 4 STROKE.
Epoxy.
Epoxy.
Epoxy.
Balsa.
Balsa.
Thread locker glue.
Blindnut.

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Thread locker glue.
Epoxy. Balsa.
Epoxy.
Balsa.
Epoxy.
Battery.
Tie Wrap.
INSTALLING THE BATTERY.
Battery.

MXS-R.Instruction Manual.
10
 7) Slide the fuel tank into the fuselage. Guide
the lines from the tank through the hole in the
firewall.
 8) Use balsa plywood to help prevent
moveable from transferring to the fuel tank as
shown.
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
thetank is installedinside the fuselage,it may
be difficult to determine which is which.
Venttube. Fuel pick up tube.
Fuel fill tube.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is 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.
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 STOPPER ASSEMBLY.
2) Usinga modeling knife, cutone length
ofsiliconfuel line. Connect one endoftheline
tothe weighted fuelpick up and the otherend
to the nylon pick up 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.
C/Aglue.
A
B
A

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4) Slidethecollarto the axle and setscrew
the collars to secure the collar to the axle and
thensliderthe wheel on theaxle with a dropof
oilon theaxlesothewheel willspinfreelywhen
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.
Venttube.
Fuel pick up tube.
Fuel fill tube.
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.
WHEEL AND WHEEL PANTS
INSTALLATION.
1) Locate the items neccessary to install
the wheel and wheel pants as shown.
2) Follow diagram below for wheel pant
installation:
Useadrill and 8mmdrillbit to drilla hole in the
wheel pants.
3) You have to trim each axle using a tool
cutting and cut-off wheel.
Balsawood included.
C/Aglue.
Fuel tank.
Blow through one of the lines to en-
sure the fuel lines have not become kinked
inside the fuel tank compartment. Air
should flow through easily.
14mm.
8mm.
Drill a hole.
B

MXS-R.Instruction Manual.
12
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.
 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.
Cut.
Cut.

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INSTALLING THE MAIN LANDING GEAR
TO FUSELAGE.
 8) The blind nuts for securing the landing
geararealready mounted inside thefuselage.
 9) Using the hardware provided, mount
the main landing gear to the fuselage.
 10) Place the fuselage inverted on the
workbenchina suitable stand. Setthelanding
gear in place and use a screwdrive to secure
the landing gear to the fuselage using bolts
M4x20mmandwashers.Makesureto use the
threadlock on the bolts so they don’t vibrate
loose.
Cut.
Cut.
Cut.

MXS-R.Instruction Manual.
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C/Aglue.
C/Aglue.
M4x20mm.

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INSTALLING THE FUSELAGE SERVOS.
1) Installthe rubber grommetsand brass
colletsonto the throttle servo. Testfittheservo
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
mayneedtoadjustthesizeoftheprecutopen-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
Switch.
Trimand cut.
3/32” Hole.
INSTALLING THE SWITCH.
MOUNTING THE ENGINE.
Installtheswitch into the precutholein the
side, in the fuselage.
 1) Positiontheenginewith thedrivewasher
(150mm) forward of the firewall as shown.
Rudder servo.
Elevator servo.
Throttle servo.
THROTTLE SERVO ARM INSTALLATION.
AdjustableServo
connector.
Servoarm.
Loctite secure.
1PCS.
Throttleservoarm.
Elevatorservo.
Rudderservo.
Installadjustableservoconnectorinthe servo
arm as same as picture below:
+ ENGINE 0.91 : 2 STROKE.

MXS-R.Instruction Manual.
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4) On the fire wall has the location for the
throttle pusshrod tube (pre-drill).
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M4x30mm 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 450mm throttle
pushrod to the outer hole of the carburetor arm.
Machinescrew M4x30mm.
Pushrodwire.
4.5mm.
150mm.
2) Use a pin drill and 4mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
4mm.
3) Use a drill to drill the four holes in the engine
mount rails.
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.

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COWLING.
1) Slide the fiberglass cowl over the en-
gineandlineupthe back edge of thecowlwith
themarks you madeon the fuselagethen trim
and cut as shown.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaft of the engine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Usethe spinnerbackplateasaguide.
Hold the cowl firmly in place using pieces of
masking tape.
Becauseofthe size of thecowl, it may benec-
essaryto use aneedle valve extensionfor the
highspeedneedlevalve. Make this out ofsuf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placeby tightening the setscrew in theside of
the needle valve.
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.
Cut.
Machine screw M3x10mm.
Needlevalve.
 3) Installthe muffler andmuffler extension
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.

MXS-R.Instruction Manual.
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4) On the fire wall has the location for the
throttle pusshrod tube (pre-drill).
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M4x30mm 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 450mm throttle
pushrod to the outer hole of the carburetor arm.
Machinescrew M4x30mm.
4.5mm.
+ ENGINE 1.20 : 2 STROKE.
150mm.
 1) Positiontheenginewiththedrivewasher
(150mm) forward of the firewall as shown.
2) Use a pin drill and 4mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
4mm.
3) Use a drill to drill the four holes in the engine
mount rails.
MOUNTING THE ENGINE.
Pushrodwire.

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COWLING.
1) Slide the fiberglass cowl over the en-
gineandlineupthe back edge of thecowlwith
themarks you madeon the fuselagethen trim
and cut as shown.
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.
Trim and cut.
Trim and cut. Machine screw M3x10mm.
Needlevalve.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaft of the engine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Usethe spinnerbackplateasaguide.
Hold the cowl firmly in place using pieces of
masking tape.
Becauseofthe size of thecowl, it may benec-
essaryto use aneedle valve extensionfor the
highspeedneedlevalve. Make this out ofsuf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placeby tightening the setscrew in theside of
the needle valve.

MXS-R.Instruction Manual.
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4) On the fire wall has the location for the
throttle pusshrod tube (pre-drill).
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M4x30mm 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 450mm throttle
pushrod to the outer hole of the carburetor arm.
Machinescrew M4x30mm.
4.5mm.
+ ENGINE 1.20 : 4 STROKE.
150mm.
 1) Positiontheenginewith thedrivewasher
(150mm) forward of the firewall as shown.
2) Use a pin drill and 4mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
4mm.
3) Use a drill to drill the four holes in the engine
mount rails.
 3) Installthe muffler andmuffler extension
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.
MOUNTING THE ENGINE.