Seagull Models PILATUS B4 User manual

Specifications:
Wingspan------------------------------118.1in(300cm).
Wingarea---------------------902.1sq.in(58.2sqdm).
Weight----------------------------5.3-5.7lbs(2.4-2.6kg).
Length-------------------------------------51.6in(131cm).
Radio--------------------------------------------6channels.
Servo-----------------5servosMN48(30x13x30mm).
2 digitals servos (40.6x19.8x37.8mm).
Airfoil:HQ2.0/10.
ASSEMBLY MANUAL
MS:132
“Graphics and specifications may change without notice”.
(Glider)

2
PILATUS B4 Instruction Manual.
INTRODUCTION.
Thank you for choosing the PILATUS B4 ARTF by SEAGULL MODELS COMPANY LTDFF. The
PILATUS B4 was designed with the sports trainer flyer in mind. It is a High-wing aeroplane which
is easy to fly and quick to assemble. The airframe is conventionally built using balsa, plywood and
veneer to make it stronger than the average ARTF , yet the design allows the aeroplane to be kept
light.Youwillfind that most oftheworkhas been done foryoualready.The pushrods are pre-made
to the correct lengths, the motor mount has been fitted and the hinges are pre-installed and pinned
for security. Flying the PILATUS B4 is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual throughly before starting assembly of your PILATUS B4. 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
proceduresdesignedtohelpthenewpilotonhiswaytosuccessfulR/Cflight.Theywillalsobeable
to advise on any insurance and safety regulations that may apply.
ADDITIONAL ITEMS REQUIRED.
- 6 channel radio with 7 servos.
- Glow plug to suit engine.
- Propeller to suit engine.
- Protective foam rubber for radio
system.
- Silicone fuel line.
- Stick-on weights for balance
(If necessary).
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.
WING ASSEMBLY
1) Right wing half with pre-installed
aileron.
2) Left winghalf withpre-installedaileron.
TAIL SECTION ASSEMBLY
1) Vertical stabilizer with pre-installed
rudder.
2) Horizontal stabilizer withpre-installed
elevartor halves.

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Instruction Manual.
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)Removeeach hinge fromthewing panel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
untiltheT-pin is snug against the aileron.This
will help ensure an equal amount of hinge is
oneithersideofthehingelinewhentheaileron
is mounted to the wing panel.
HINGING THE AILERONS .
Note:
Hinge.
T-pin.
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 betweenthe wingpanel
andaileron.
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges. 4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurfaceshould lightly contactthe
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.
Thehingeisconstructedof 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.
Note:
Hinge.
C/Aglue.
C/Aglue.

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PILATUS B4 Instruction Manual.
INSTALLING THE FUSELAGE SERVO.
1) Installthe rubbergrommets andbrass
colletsonto the throttleservo. 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
mayneedtoadjustthe size of theprecutopen-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
Rudderservo.
SERVO ARM INSTALLATION.
Installadjustableservoconnectorinthe servo
arm as same as picture below:
AdjustableServo
connector.
Servoarm.
Loctite secure.
1PCS.
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 up and down several
times to “work in” the hinges and
check for proper movement.
Note:
6) Using C/A remover/debonder and a
papertowel, remove anyexcess C/A gluethat
may have accumulated on the wing or in the
aileronhinge area.
5)Turnthe wingpanelover anddeflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge,makingsure that the C/A penetrates into
both the aileron and wing panel.
HINGING THE ELEVATOR.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.

5
Instruction Manual.
Installthe switch intothe precut holein the
side of fuselage.
INSTALLING THE SWITCH.
Switch.
ELEVATOR SERVO.
Rudderservoarm.

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PILATUS B4 Instruction Manual.
Servos.
2) Usinga small weight (Weighted fuel pick-up
workswell)andstring, feed the string through
the wing as indicated.
Because the size of servos differ, you
mayneedtoadjustthe size of the precut open-
ing in the mount. The notch in the sides of
themountallowtheservoleadtopassthrough.
String.
Small weight.
M2x6mm.
AILERON SERVO INSTALLATION.

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Instruction Manual.
1) 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
servoextension lead. Pullthelead throughthe
wing and remove the string.
C/Aglue.
Micro control connector.
FLAP SERVO INSTALLATION.
Attach the string to the servo lead and carefully thread it though the wing.
M2x6mm.
Wing rib.
Wing.
Small weight.
String.
Flap servo.
M2x6mm. Aileronservo.

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PILATUS B4 Instruction Manual.
C/Aglue.
1mm
AILERONPUSHRODHORN INSTALLATION
Pen.
Center line.

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Instruction Manual.
Snapkeeper.
Servoarm.
8mm Snapkeeper.
M2 lock nut. Metalclevis.
8mm
Pen.
Cut.
Repeat the procedure for the other
aileron servo.
HINGING THE AIRBRAKES.
C/Aglue.
C/Aglue.

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PILATUS B4 Instruction Manual.
3mm
Cut.
M2x6mm.
AIRBREAKES PUSHROD
CONTROLHORN INSTALLATION.
C/Aglue.
M2x6mm.

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Instruction Manual.
RUDDER PUSHROD.
1mm
C/Aglue.
M2x12mm.
Pen.
8mm
M2x12mm.
Cut.

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PILATUS B4 Instruction Manual.
M3x30mm.
C/Aglue.
ELEVATOR CONTROL HORN
INSTALLATION.
M2x12mm.
Center line.
Pen.
1mm

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Instruction Manual.
ELEVATOR PUSHROD INSTALLATION.
M3x30mm.
Snapkeeper.
Servoarm.
8mm Snapkeeper.
M2 lock nut. Metalclevis.
Pen.
8mm
Cut.

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PILATUS B4 Instruction Manual.
Receiver.
Battery.
SERVO INSTALLATION.
INSTALLING THE RECEIVERAND BATTERY.
M2x6mm.
1) Plugthefive servo leadsandthe switch
lead into the receiver. Plug the battery pack
lead into the switch also.
 3) Routethe antennain the antenna tube
insidethe fuselageand secureit to the bottom
of fuselage using a plastic tape.
2) Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration.
The tow hook.
The above is the tow hook position.

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Instruction Manual.
ATTACHMENT WING -FUSELAGE.
Wing bolt.
BALANCING.
 1) It is critical that your airplane be
balanced correctly. Improper balance will
cause your plane to lose control and crash.
THE CENTER OF GRAVITY IS LOCATED
65 MM BACK FROM THE LEADING EDGE
OF THE WING AT THE WING ROOT.
 3) Turn the airplane upside down. Place
yourfingerson themaskingtape and carefully
lift the plane .
 2) Mount the wing to the fuselage. Using a
couple of pieces of masking tape, place them
on the top side of the wing 65 mm back from
the leading edge of the wing at the wing root.
Accurately mark the balance point on the top
of the wing on both sides of the fuselage. The
balance point is located 65 mm back from
the leading edge of the wing at the wing root.
This is the balance point at which your model
should balance for your first flights. Later, you
maywishtoexperiment by shifting thebalance
up to 10mm forward or back to change the
flying characteristics. Moving the balance
forward may improve the smoothness and
arrow- like tracking, but it may then require
more speed for take off and make it more
difficult to slow down for landing. Moving the
balance aft makes the model more agile with
alighter and snappier ”feel”.Inanycase,please
start at the location we recommend .

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PILATUS B4 Instruction Manual.
CONTROL THROWS.
Ailerons: 14mm up 14mm down.
Elevator: 13mm up 13mm down.
Rudder: 25mm right 25mm left.
65mm.
*Ifpossible, firstattempt tobalance themodel
bychangingthepositionofthe receiver battery
and receiver. If you are unable to obtain good
balance by doing so, then it will be necessary
toadd weightto thenose or tail to achieve the
proper balance point.
Withthewingattachedtothefuselage,allparts
ofthemodel installed (readyto fly),andempty
fuel tanks, hold the model at the
markedbalance point withthe stabilizerlevel..
Lift the model. If the tail drops when you lift,
the model is “tail heavy” and you must add
weight* to the nose. If the nose drops, it is
“nose heavy” and you must add weight* to
the tail to balance.

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Instruction Manual.
E) Check the throttle. Moving the
throttle stick forward should open the carbu-
retor barrel. If it does not, flip the servo re-
versing switch on your transmitter to change
the direction.
FLIGHT PREPARATION.
C) Check the elevator first. Pull back
on the elevator stick. The elevator halves
shouldmove up. If itthey do not,flip theservo
reversingswitchon your transmitterto change
the direction.
D) Check the rudder. Looking from
behind the airplane, move the rudder stick to
theright. The rudder shouldmove to theright.
Ifit does not,flip theservo reversing switchon
your transmitter to change the direction.
A) Check the operation and direction
of the elevator, rudder, ailerons and throttle.
B) Plug in your radio system per the
manufacture’sinstructionsandturneverything
on.
F) From behind the airplane, look at
the aileron on the right wing half. Move the
aileron stick to the right. The right aileron
should move up and the other aileron should
move down. If it does not, flip the servo re-
versing switch on your transmitter to change
the direction.
PREFLIGHT CHECK.
1) Completely charge your transmitter
and receiver batteries before your first day of
flying.
2) Check every bolt and every glue joint
in the PILATUS B4 to ensure that everything
is tight and well bonded.
4) Checkthe controlsurfaces. All should
move in the correct direction and not bind in
any way.
5) If your radio transmitter is equipped
withdual rate switchesdouble checkthat they
are on the low rate setting for your first few
flights.
6) Check to ensure the control surfaces
are moving the proper amount for both low
and high rate settings.
7) Check the receiver antenna. It should
be fully extended and not coiled up inside the
fuselage.
We wish you many safe and enjoyable
flights with your PILATUS B4.
8) Properlybalance thepropeller. Anout
of balance propeller will cause excessive vi-
bration which could lead to engine and/or air-
frame failure.
3) Double check the balance of the air-
plane. Do this with the fuel tank empty.