Seagull Models ultra-jet User manual

“Graphics and specifications may change without notice”.
MS:159
ASSEMBLY MANUAL
Specifications:
Wingspan----------------------------61.8in(157cm).
Wingarea-----------------1100.5sq.in(71.0sqdm).
Weight-----------------------6.6-7.5lbs(3.0-3.4kg).
Length---------------------------------59.1in(150cm).
Engine --------------- 0.61-0.95cu.in----2-stroke.
Radio--------------------6channelswith6 servos.
Electricconversion:optional

ULTRA JET Instruction Manual.
2
INTRODUCTION.
Thank you for choosing the ULTRA JET ARTF by SEAGULL MODELS COMPANY LTD. The
ULTRAJET wasdesignedwiththeintermediate/advancedsportflyerinmind.Itisanot semiscale
airplane whichiseasytoflyandquicktoassemble.Theairframeisconventionallybuiltusingbalsa,
plywoodtomake it stronger than theaverageARTF, yet the design allowstheaeroplane to be kept
light. You will find that most of the work has been done for you already. The motor mount not fitted
and the hinges are pre-installed. Flying the ULTRA JET 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 ULTRA JET . Use the parts listing below to
identify all parts.
WARNING.
Please be aware that this aeroplane is not a toy and if it is assembled or used incorrectly it
will cause 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 helpthenewpilot onhiswaytosuccessful R/Cflight.Theywill alsobeable
to advise on any insurance and safety regulations that may apply.
KIT CONTENTS
1
2
2
3
3
5
5
4
3
77
7
7
6

3
www.seagullmodels.com
ADDITIONAL ITEMS REQUIRED.
0.61-0.95 2-stroke.
Computer radio with 6 servos.
Glow plug to suit engine.
Pusher propeller to suit engine.
Protective foam rubber for radio
system.
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.
1 Fuselage
2 Wing Set
3 Vertical Fins
4 Canopy
5 Leading Edge Extension
6 Aluminum Wing Tube
7 Hardware bag included
KIT CONTENTS. INSTALL ELEVON CONTROL HORN.
Elevon control horn.
Epoxy.
Epoxy.
Fiberglass control horn.
INSTALL LEADING EDGE
EXTENSION

ULTRA JET Instruction Manual.
4
1) Attach the Leading Edge Extension to the
wing. Use a hobby knife to remove the covering
at the Leading Edge Extension and wing end.
2) Apply epoxy to the surface of the Wing and
Leading Edge Extension and hole them
together until the epoxy had set.
Removecovering.
Removecovering.
Fillepoxy.
Fillepoxy.
Fillepoxy.
Sealcoveringiron.

5
www.seagullmodels.com
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.
Thread locker glue.
2) Usingamodeling knife, cut one length
ofsiliconfuelline. Connectoneendoftheline
totheweighted fuel pick up and theotherend
to the nylon pick up tube.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
Venttube. Fuel pick up tube.
Fuel fill tube.
ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install the
engine mount included with your model.
2) Usefour4x30mmheadboltsandfour 4mm
washers to attach the engine mount rails to
thefirewall.Tighten the screws . Make sureto
use threadlock on the screws to help prevent
them from vibrating loose.
4x30mm.

ULTRA JET Instruction Manual.
6
1) Installthe rubber grommets and brass
colletsonto thethrottleservo. Testfittheservo
into the throttle servo mount.
INSTALLING THE FUSELAGE SERVOS.
Because the size of servos differ, you
mayneedto adjust the sizeoftheprecutopen-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
 8) Use plywood template to hold in place
the fuel tank with C/A glue to secure the fuel
tank inside the fuselage.
Venttube.
Fuel pick up tube.
Fuel fill tube.
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.
M3x10mm.
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
thetank is installed inside thefuselage,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.
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 pick-up should rest away from
therear of thetank 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.
C/Aglue.

7
www.seagullmodels.com
 2) Secure the servos with the screws pro-
vided with your radio system.
THROTTLE SERVO ARM INSTALLATION.
Installadjustableservoconnectorinthe servo
arm as same as picture below:
Throttle servo.
Retract servo.
Retract servo arm.
Trim and cut.
3/32” Hole.
INSTALLING THE SWITCH.
Installtheswitchintotheprecut hole in the
side, in the fuselage.
Steering servo. Steering servo arm.
AdjustableServo
Servoarm.
Loctite secure.
1
Diameter=2mm. 2
Diameter=3mm.
Throttle servo arm.

ULTRA JET Instruction Manual.
8
M3x30mm
7) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M3x30mm 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.
Pushrod tube hole.
3) Use a drill to drill the four holes in the engine
mount rails.
4) On the fire wall has drill a hole in the firewall
for the throttle pushrod the location for the
throttle pusshrod tube (pre-drill).
4.5mm.
4mm.
2) Use a pin drill and 4mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
MOUNTING THE ENGINE.
 1) Positionthe enginewiththedrive washer
(130mm) forward of the firewall as shown.
130mm.
Switch.

9
www.seagullmodels.com
9) Move the throttle stick to the closed position
and move the carburetor to closed. Use a 1.5mm
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.
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.
Pushrod wire
Screw.
ELECTRIC POWER CONVERSION.
1) Locate the items neccessary to install the
electric power conversion included with your
model.
2) Attach the draw cross lines on the sub firewall
to locate the centred mounting position of your
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
Recommendation EP parts as shown (not
included with your model)
Ruler.
Pen.

ULTRA JET Instruction Manual.
10
Electric motor.
M3x15mm.
4mm.
Blindnut.
3) Attach the motor to the front of the electric
motor box using four 3mm blind nut, four
M3x15mm hex head bolts to secure the motor.
Please see picture shown.
M4x60mm.

11
www.seagullmodels.com
Battery.
Speed control.
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.
4) Locate the plywood battery tray to the
fuselage. Tighten the screws using machine
screws M3x15mm to secure the tray in position.
INSTALLING THE SPINNER.
Install the spinner backplate, propeller and
spinner cone.
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.
INSTALLING NOSE RETRACTABLE
LANDING GEAR .
Locate the items ceccessary to install the
Retractable landing gear as shown.
M2x6mm.
1) Install Retractable landing gear..

ULTRA JET Instruction Manual.
12
2mm Diameter Screw.
M3x15mm.
2) Install Pushrod.
M2 lock nut.
M2clevis.
70mm.
Retract pushrod.
M3lock nut. M3 clevis.
1
1
CableSteering.
2mm.
2mm.

13
www.seagullmodels.com
Axle.
Landinggear.
Axle.
Wheel collar.
Axle.
Wheel.
2
3) Install Wheel.
2.
Wheel collar.
Screw.
M2x10mm.
Screw.
INSTALLING THEAILERON
M3clevis.

ULTRA JET Instruction Manual.
14
3) Use drill bit in a pin vise to drill the mouting
holes in the blocks.
String.
Small weight.
1) Usingasmall weight (Weighted fuelpick-up
workswell)andstring, feed the string through
the wing as indicated.
2) Place the servo between the mounting
blocksand spaceitfromthehatch.Usea pencil
to mark the mounting hole locations on the
blocks.
Servos. Smallweight.
Thread.
Because the size of servos differ, you
mayneed toadjustthesize oftheprecutopen-
ing in the mount. The notch in the sides of
themountallowthe servoleadtopassthrough.
4) Apply 2-3 drops of thin C/A to each of the
mounting holes. Allow the C/A to cure without
using accelerator.
6) Secure the servo to the aileron hatch using
Phillips screwdriver and the screws provided
with the servo.
5) Use dental floss to secure the connection
so they cannot become unplugged.
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.Pulltheleadthroughthe
wing and remove the string.

15
www.seagullmodels.com
Small weight.
String.
ELEVON PUSHRODHORN INSTALLATION.
M3 lock nut.
M3clevis.
125mm.
155mm.
9) Set the elevon hatch in place and use a
Phillips screw driver to install it with four wood
screws.

ULTRA JET Instruction Manual.
16
Epoxy.
INSTALLING RETRACTABLE
LANDING GEAR .
2mm Diameter Screw.
Elevon pushrod.
M3 lock nut.
M3x15mm.
Screw.
Wheel Fairing.
2mm.

17
www.seagullmodels.com
Epoxy.
Wheel Collar.
Screw.
Wheel .
Screw.
Wheel Collar.
Wheel .
RETRACTABLE LANDING GEAR
PUSHROD INSTALLATION
1) Locate items necessary to install landing
gear pushrod .

ULTRA JET Instruction Manual.
18
ATTACHMENT TAIL - WING.
M3 lock nut.
M3clevis.
30mm.
50mm.
M3x20mm.
Pushrod .

19
www.seagullmodels.com
2) Apply the epoxy to the surface of both tail
and wing end. The tail is held in position and
install it to the wing end. Please see pictures
shown.
Removecovering.
Removecovering.
Fillepoxy.
Fillepoxy.
Fillepoxy.
1) Attach the tail to the wing. Use a hobby knife
to remove the covering at the tail and wing end.
 3) With the tail held firmly in place, use a
pen and draw lines onto the tail where it and
the wing sides meet. Do this on both the right
and left sides and top and bottom of the tail.
 4) Remove the tail and wing. Using the
lines you just drew as a guide, carefully re-
move the covering from between them using
a modeling knife.
Pen.

ULTRA JET Instruction Manual.
20
2
120mm.
5) Apply the epoxy to the surface of both tail
and wing end. The tail is held in position and
install it to the wing end. Please see pictures
shown.
Fillepoxy.
Fillepoxy.
INSTALLATION PILOT AND CANOPY.
2
1
1) Locate items necessary to install pilot, and
canopy.
2) A scale pilot is included with this ARF. The
Seagull Pilot included fitting well to the cockpit.
(or you can order others scale pilot figures
made by Seagull factory. They are available at
Seagull distributors.)
3) Position the pilot figure on the canopy floor
as show. Locate the oval shaped on the canopy
floor and remove the covering. Use epoxy to
glue this into the base of the pilot figure and
glue the cockpit panel in place with C/A glue,
please see pictures as shown.
If you are going to install a pilot figure, please
use a sanding bar to sand the base of the figure
so that it is flat.
Fillepoxy.
Whencuttingthroughthecoveringtore-
move it, cut with only enough pressure
toonly cut through the covering itself. Cutting
into the balsa structure may weaken it.
Removecovering.