Seagull Models GROB TUTOR G115 User manual

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ASSEMBLY MANUAL
MS:144
Specifications:
Wingspan-------------------------66.9in(170.0cm)
Wingarea--------------548.7sq.in(35.4sqdm)
Weight-------------------------------7.1-8.4lbs(3.2-3.8kg)
Length---------------------------48.6in(123.5cm)
Engine -------------0.46-.0.55cu.in-----2-stroke.
0.72 - 0.82cu.in -----4-stroke.
Radio-----------------6channelswith7servos.
“Graphics and specifications may change without notice”.
Electricconversion:optional.

GROB TUTOR G115 Instruction Manual.
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INTRODUCTION.
Thank you for choosing the GROB TUROR G115 ARTF by SEAGULL MODELS COMPANY LTD.
The GROB TUROR G115 was designed with the intermediate/advanced sport flyer in mind. It is a
semi scale airplane which is easy to fly and quick to assemble. The airframe is conventionally built
usingbalsa,plywoodtomakeitstrongerthantheaverageARTF,yetthedesignallowstheaeroplane
to be kept 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 GROB TUROR G115 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 GROB TUROR G115 . 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
proceduresdesigned tohelp thenewpilot onhiswaytosuccessful R/Cflight.They willalsobeable
to advise on any insurance and safety regulations that may apply.
KIT CONTENTS
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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 Seat (2)
9 Landing gear
10 Wheels (3)
11 Fuel tank
12 Nose gear
13 Wheel pants (3)
14 EP conversion pack
15 Hardware bag included
16 Fiberglass cowl
ADDITIONAL ITEMS REQUIRED.
0.46-0.55 2-stroke engine
0.72 -0.82 4-stroke engine
6 channel with 7 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
HINGING THE FLAP .
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.
Note:
1) Carefully remove the flap from one of
thewingpanels.Notethepositionofthehinges.
Hinge.
T-pin.
2)Remove each hinge fromthewingpanel
andflap and placeaT-pinin thecenterofeach
hinge. Slide each hinge into the aileron until
the T-pin is snug against the aileron. This will
help ensure an equal amount of hinge is on
either side of the hinge line when the flap is
mounted to the wing panel.
3) Slide the flap on the wing panel until
there is only a slight gap. The hinge is now
centered on the wing panel and flap. Remove
the T-pins and snug the flap against the wing
panel. A gap of 1/64” or less should be
maintained between the wing panel and flap.

GROB TUTOR G115 Instruction Manual.
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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.
HINGING THE AILERONS .
Note:
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.
2)Remove each hinge fromthewingpanel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
untiltheT-pin is snugagainst the aileron.This
will help ensure an equal amount of hinge is
oneither sideofthe hingelinewhentheaileron
is mounted to the wing panel.
Hinge.
4)Deflect the flap and completely saturate
eachhingewiththinC/Aglue.Theaileronsfront
surface should lightly contact the wing during
this procedure. Ideally, when the
Thehinge is constructedof 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 flap.
hinges are glued in place, a 1/64” gap or less
will be maintained throughout the lengh of the
flap to the wing panel hinge line.
Note:
8)Afterbothflap aresecurelyhinged,firmly
grasp the wing panel and flap to make sure
the hinges are securely glued and cannot be
pulled out. Do this by carefully applying
medium pressure, trying to separate the flap
from the wing panel. Use caution not to crush
the wing structure.
7) Repeat this process with the other wing
panel, securely hinging the flap in place.
6) Using C/A remover/debonder and a
papertowel,removeany excess C/A glue that
may have accumulated on the wing or in the
flap hinge area.
5)Turnthe wing paneloveranddeflectthe
flapinthe opposite direction from the opposite
side.Applythin C/Agluetoeach hinge,making
sure that the C/A penetrates into both the flap
and wing panel.
Work the flap down several times to
“work in” the hinges and check for
proper movement.
Note:

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4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfront surface shouldlightlycontactthe
wing during this procedure. Ideally, when the
Thehinge is constructedof 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:
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.Agap of 1/64” or less
shouldbemaintainedbetweenthewingpanel
andaileron.
Hinge.
T-pin.
Hinge.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
6) Using C/A remover/debonder and a
papertowel,removeany excess C/A glue that
may have accumulated on the wing or in the
aileronhingearea.
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,makingsurethat theC/A penetratesinto
both the aileron and wing panel.

GROB TUTOR G115 Instruction Manual.
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3) Once the epoxy cures and use a covering
iron to seal the covering on the wing and over
the wing tip.
WING TIP ASSEMBLY.
Removecovering.
Fillepoxy.
Covering.
Wing tip.
1) Attach the plastic wing tip to the wing. Use a
hobby knife to remove the covering at the wing
end.
2) Apply the epoxy to the surface of both wing
tip and wing end. The plastic wing tip is held in
position and install it to the wing end. Please
see pictures shown.
Workthe aileronup anddown several
times to “work in” the hinges and
check for proper movement.
Note:
HINGING THE ELEVATORS.
Glue the elevator hinges in place using the
same techniques used to hinge the ailerons.
HINGING THE RUDDER.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.
Hinge.
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.

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INSTALL THE AILERONS CONTROL
HORN.
2 sets.
3x35mm.
Maskingtape.
Sealingiron.
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 3mm 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
18mm from the vase of the horn as shown.
Aileron control horn .
ALUMINUMWASHER.
ALUMINUMWASHER.
CONTROLHORN
M3 SCREW.
14mm.
Epoxy.
Wing
Wing
Epoxy.
M3LOCKNUT.
Install the flap control horn using the same
methodas same as the aileroncontrolhorns.
INSTALL FLAP CONTROL HORN.

GROB TUTOR G115 Instruction Manual.
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Install the elevator control horn using the
same method as same as the aileron control
horns.
INSTALL ELEVATOR CONTROL HORN.
AluminumWasher.
CONTROLHORNM3
M3LOCK NUT.
Epoxy.
AluminumWasher.
Horizontal
Stabilizer. Elevator.
3mm.
Flap control horn.
1 sets.
3x30mm.
2 sets.
3x30mm.
ALUMINUMWASHER.
ALUMINUMWASHER.
CONTROLHORN
M3 SCREW.
14mm.
Epoxy.
Epoxy.
M3LOCKNUT.
3mm.

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Repeatsteps to install the rudder control horn
as same as steps done for ailerons.
INSTALL RUDDER CONTROL HORN.
1 sets.
3x30mm.
3mm.
14mm.
Epoxy.
Horizontal
Stabilizer. Elevator.
Elevatorcontrolhorn.
14mm.
Epoxy.
Rudder.
Rudder.
Aluminum Washer.
CONTROLHORN
M3 SCREW.
Aluminum Washer.
Epoxy.
M3LOCK NUT.
Rudder control horn.
1) Locate the items necessary to install the
engine mount included with your model. .
ENGINE MOUNT INSTALLATION.
4x30mm.

GROB TUTOR G115 Instruction Manual.
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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.
Venttube. Fuel pick up tube.
Fuel fill 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.
2) Usefour 4x30mm head boltsandfour4mm
washers to attach the engine mount rails to
thefirewall.Tightenthe screws . Make sure to
use threadlock on the screws to help prevent
them from vibrating loose.
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) Usingamodelingknife,cutonelength
ofsiliconfuel line. Connect one end of the line
totheweightedfuelpickup 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.
Thread locker glue.
Screw.
Tie wrap.
Balsa.

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Fueltank.
8) Use plywood template to hold in place the
fuel tank with C/A glue to secure the fuel tank
inside the fuselage.
9) Use balsa stick to help prevent moveable
from transferring to the fuel tank.
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
thetankisinstalled 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.
Epoxy
Tie wrap.
Balsa wood included
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.
venttube.
Fuelpick-uptube.
Fuelfill tube.
INSTALLING THE FUSELAGE SERVOS.
1) Installtherubbergrommets and brass
colletsontothethrottle servo. Testfit the 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
mayneed toadjustthesize oftheprecut open-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
10) 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.

GROB TUTOR G115 Instruction Manual.
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2) Use a pin drill and 2mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
110mm.
MOUNTING THE ENGINE.
 1) Positiontheengine withthe drivewasher
(110mm) forward of the firewall as shown.
Trim and cut.
Switch.
Throttle servo.
Elevator servo.
Rudder servo.
THROTTLE SERVO ARM INSTALLATION.
Installadjustable servoconnectorinthe servo
arm as same as picture below:
AdjustableServo
connector.
Servoarm.
Loctite secure.
Nut.
Elevator servo arm.
Throttle servo arm. Rudder servo arm.
INSTALLING THE SWITCH.
3/32” Hole.
Installtheswitchinto the precut hole in the
side, in the fuselage.

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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.
Pushrodtubehole.
3) Use a drill to drill the four holes in the engine
mount rails.
4) On the fire wall has the location for the
throttle pusshrod tube (pre-drill).
2mmdiameter.
2mm
Pushrodwire.
Machinescrew M3x25mm.
Trim and cut.
Linkage.
.
7) Slide the throttle pushrod wire into the
tube. Position the engine between the
mounts. Use four 3x25mm machine screws to
secure the engine to the mount as shown.
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.

GROB TUTOR G115 Instruction Manual.
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3
5
4
1
1
5
3
1
Screw.
.
4-5mm.
LANDING GEAR INSTALLATION:
A. NOSE GEAR:
1) Locate the items necessary to attach the
nose landing gear that are included with your
model.
3
1
2
4
5
31
Screw.
.
Thread locker glue.

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4
2
5
2) Install landing gear at the top Fuselage.
Adjustable connector.
M2clevis.
Screw.
.

GROB TUTOR G115 Instruction Manual.
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Trim and cut.
5mm.
 2) Install lights at the top Cowling.
1) Slide the fiberglass cowl over the en-
gineand line up the backedgeofthecowl with
themarksyoumadeon the fuselage then trim
and cut as shown.
COWLING.
Trim and cut.
Trim and cut.

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C/Aglue.  4) Install the muffler andmufflerextension
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.
Machine screw M3x10mm.
3) 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.Usethespinner backplateasaguide.
Hold the cowl firmly in place using pieces of
masking tape.
Needlevalve.
Becauseofthesizeof the cowl, it may be nec-
essarytouseaneedle valve extension for the
highspeedneedle valve. Make this out of suf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placebytighteningthesetscrewinthe side of
the needle valve.

GROB TUTOR G115 Instruction Manual.
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3) Attach the motor to the front of the electric
motor box using four 4mm blind nut, four
M4x15mm hex head bolts to secure the motor.
Please see picture shown.
Blindnut.
4mm.
M3x15mm
ELECTRIC POWER CONVERSION
- Model size: 45-52 size models
- Motor: 35mm 830 rev per volt
- Propeller: 11x7-12x7
- ESC: 50A
- Lipo Batteries: 4cell 3200mA
1) Locate the items neccessary to install the
electric power conversion 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.
M4x20mm.
Recommen the items neccssary to install the
electric power conversion parts included with
your model.

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Balsa sticks
135mm.
4) Locate the plywood battery tray to the
fuselage. Tighten the screws using machine
screws M3x15mm to secure the tray in position.
Epoxy ElectricMotor
Epoxy
Tie wraps
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.
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.
Battery.

GROB TUTOR G115 Instruction Manual.
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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.
3) Use drill bit in a pin vise to drill the mouting
holes in the blocks.
String.
Small weight.
1) Usingasmallweight(Weightedfuel pick-up
workswell) and string, feed the string through
the wing as indicated.
2) Place the servo between the mounting
blocksandspaceitfromthehatch.Use apencil
to mark the mounting hole locations on the
blocks.
Servos. Smallweight.
Thread.
INSTALLING THEAILERON.
Because the size of servos differ, you
mayneedtoadjust thesizeoftheprecutopen-
ing in the mount. The notch in the sides of
themountallowtheservoleadtopassthrough.