arf BO-209 MONSUN Owner's manual

Instruction Manual book
SPECIFICATION
Wingspan : 2,200 mm 86.61 in.
Length : 1,640 mm 64.57 in.
Weight : 6.5 kg 14.3Lbs.
Radio : 8 channels.
Servo : 09 servos
Engine : 26-35 CC Gas.
MadeinVietnam.
ITEM CODE: BH122.

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your BO 209-209 MON SUN. 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
proceduresdesignedtohelpthenew pilotonhiswaytosuccessfulR/C flight.Theywillalso beable
to advise on any insurance and safety regulations that may apply.
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.
Some more parts.
HARDWAREPACK
COWLING.
Landing gear.....
Toavoid scratching yournew airplane,do not
unwrap the pieces until they are needed for
assembly. Cover your workbench with an old
towel or brown paper, both to protect the
aircraftand toprotect thetable. Keepa couple
of jars or bowls handy to hold the small parts
after you open the bag.
Pleasetrialfitalltheparts. Makesureyouhave
the correct parts and that they fit and are
alignedproperly beforegluing!Thiswillassure
properassembly.BO 209 MON SUN ARFis hand
made from natural materials, every plane is
unique and minor adjustments may have to
be made. However, you should find the fit su-
perior and assembly simple.
The painted and plastic parts used in this kit
are fuel proof. However, they are not tolerant
of many harsh chemicals including the
following: paint thinner, C/A glue accelerator,
C/A glue debonder and acetone. Do not let
these chemicals come in contact with the
colors on the covering and the plastic parts.
PARTS LISTING.
FUSELAGE ASSEMBLY
(1) Fuselage.
WING ASSEMBLY
(1) Right wing half with pre-installed
aileron.
(1) Left wing half with pre-installed
aileron.
Tail section assembly
(1) Vertical stabilizer with pre-
installedrudder.
(1) Horizontal stabilizer with pre-
installedelevator halves.
SUGGESTION.
NOTE.

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
Caution: this model is not a toy!
If you are a beginner to this type of powered
model,please askan experiencedmodelflyer
forhelp andsupport.Ifyouattempttooperate
themodel withoutknowingwhat youaredoing
you could easily injure yourself or somebody
else. Please keep your safety and well-being
in mind at all times.
Important: before you start construction
Evenifyou havealready built alarge number
ofRC modelspleaseread rightthrough these
instructions and check all the kit components
against the parts list. We have taken great
trouble to keep construction as simple as
possible, without making any compromises
in the area of safety.
Note regarding the film covering
Minor creases or bubbles may develop in the
film covering due to major fluctuations in
weather conditions (temperature, humidity
etc.); in rare cases you may even find a slight
warp in a component. These minor faults are
in the nature of film-covered built-up wooden
structures, and can easily be corrected using
a heat gun, as commonly used for modelling.
Creases: Blowwarm airoverthearea
and rub down with a soft
cloth.
Caution! do not heat the film more than is
absolutely necessary. If the air or the iron is
too hot, the film may melt and holes may be
formed.
This model is highly pre-fabricated and can
bebuilt inaveryshorttime. However,the work
which you have to carry out is important and
must be done carefully. The model will only
be strong and fly well if you complete your
taskscompetently -so pleaseworkslowlyand
accurately.
When self-tapping screws have to be
screwed into wood, apply a little white glue
to prevent them shaking loose: just squirt
white glue into the hole and fit the screw.
+ This is not a toy
+ Be sure that no other flyers are using your
radio frequency.
+Theglowplug clipmustbesecurely attached
to the glow plug.
SAFETY PRECAUTION.
+ Do not flip the propeller with your fingers.
+ Keep loose clothing and wires away from
thepropeller.
+Donot startthe motorif peopleare near. Do
not stand in line with the side of the propeller.
REPLACEMENT LARGE PARTS
Wing warp: Holdthepanel twistedgently
in the opposite direction to
the warp, and apply warm
air to remove the creases
from the covering.
B. Wing panel. D. Horizontal stabilizer.
E. Rudder. F. Aluminium wing dihedral brace.
A.Cowling. G. Decal sheet.
C. Fuselage.
B
A
B.
F.
C.
D. D.
E
G

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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2)Using amodeling knife,remove thecov-
ering at possition show below. Remove
covering
1) Install the rubber grommets and brass
eyelets onto the aileron servo.
1.INSTALLING THEAILERON SERVO.
REPLACEMENT SMALL PARTS
9.Plastic part Vertical stabilize
4. Wheels.
2. Wheel pant.
7.Spinners.
8. Plastic for elevator pushrod.
Bottom side.
3. Nose gear set (with oleo struts)
6. Tie wrap.
I-AILERON
5. Fuel tank.
aileron
1. Aluminium landing gear.
6.
1.
2. 3.
4.
5. 7.
8.
9.

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
Secure
4)Drill 1,6mmpilot holesthroughtheblock
of wood for each of the four mounting screws
provided with the servo.
3) Using the thread as a guide and using
masking tape, tape the servo lead to the end
of the thread: carefully pull the thread out.
When you have pulled the servo lead out, re-
move the masking tape and the servo lead
from the thread.
5. Instal servo tray with aileron servo into
the wing as same as picture below.
thread
Electric wire
Secure.
2x10mm
Repeat the procedure for the other wing
half.
servotray.

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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3.INSTALLING THE AILERON
LINKAGES.
2.INSTALLING THE AILERON
CONTROL HORN.
Secure.
Controlhorn of Aileron
75 mm
M3 lock nut M3
3 X 10mm
Control horn.
A+B EPOXY
PLUS glue
A+B EPOXY PLUS glue
Controlhorn
of Aileron
Aileron
Markline

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
Secure.
2.INSTALLING THE FLAP
CONTROL HORN.
ControlhornofFlap.
A+B EPOXY
PLUS glue
A+B EPOXY
PLUS glue
Controlhorn
of Flap.
1.INSTALLING THE FLAP SERVO.
II - FLAP.
Flap.
2x10mm.

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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3.INSTALLING THE FLAP
LINKAGES .
Secure.
Repeat the procedure for the other wing
half.
75 mm
M3 lock nut M3
3 X 10mm
See pictures below:
Bottom side
Flap. Aileron.
INSTALLING THE ENGINE MOUNT.
Drill a hole
5mmdiameter
5x70mm

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
Secure.
INSTALLING THE ENGINE.
1. Install one adjustable metal connector
through the third hole out from the center of
one servo arm, enlarge the hole in the servo
arm using a 2mm drill bit to accommodate the
servo connector. Remove the excess mate-
rial from the arm.
After installing the adjustable metal con-
nector apply a small drop of thin C/A to
the bottom nut. This will prevent the con-
nector from loosening during flight.
INSTALLING THE THROTTLE - CABLE.
Right side
Throttleservo
Throttlecable.
Throttleservo
Throttle cable.
Left side.
Tie wrap.
Electric
Power.

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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INSTALLING THE STOPPER ASSEMBLY
FUEL TANK.
1) The stopper has been pre-assembled
at the factory.
2) Using a modeling knife, cut one length
ofsilicon fuelline(thelengthofsiliconfuel line
iscalculatedbyhowtheweightedclunkshould
restabout 8mmaway fromtherearofthetank
andmove freelyinside thetank). Connectone
6. When satisfied with the alignment of the
stopper assembly tighten the 3mm x 20mm
machine screw until the rubber stopper ex-
pandsand sealsthetank opening.Do notover
tighten the assembly as this could cause the
tank to split.
7. Using a modeling knife, cut 3 lengths of
fuel line 150mm long. Connect 2 lines to the 2
vent tubes and 1 line to the fuel pickup tube in
the stopper.
8. Feed three lines through the fuel tank
compartment and through the pre-drilled hole
in the firewall. Pull the lines out from behind
the engine, while guiding the fuel tank into
place. Push the fuel tank as far forward as
possible,the frontofthetankshould justabout
touch the back of the firewall.
5. Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using
amodeling knife. Ifflashing is present, make
sure none of it falls into the tank.
Vent tube Fuel pick- up tube
Fuelfilltube
Tygon gas tubing not included.
end of the line to the weighted clunk and the
otherend tothenylonpickuptubein thestop-
per.
3) Carefully bend the second nylon tube
up at a 45 degree angle (using a cigarette
lighter). This tube will be the vent tube to the
muffler.
4) Carefullybend thethirdnylon tubedown
ata 45degreeangle (usingacigarettelighter).
This tubewill bevent tubeto thefuelingvalve.
When the stopper assembly is installed in the
tank, the top of the vent tube should rest just
belowthe topsurfaceof thetank. Itshould not
touch the top of the tank.
Throttlecable.
Font view

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
Do not secure the tank into place perma-
nently until after balancing the airplane.
You may need to remove the tank to mount
the battery in the fuel tank compartment.
Blow through one of the lines to ensure
the fuel lines have not become kinked inside
the fuel tank compartment. Air should flow
througheasily.
9. To secure the fuel tank in place, apply a
bead of silicon sealer to the forward area of
thetank, whereit exitsthefuselage behindthe
enginemountingbox andtotherearofthetank
at the forward bulkhead.
Secure.
FuelTank
Tie wrap.
NOSE GEAR INSTALLATION.
Adjust the nose gear steering arm until the
arm is parallel with the fire wall.
Installing steering arm as follow
3 x 25mm
Secure

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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Secure.
SERVO NOSE GEAR INSTALLATION.

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
PARTSREQUIRED
MAIN GEAR INSTALATION.
1)Assembleand mountingthewheel pants
as shown in the following pictures.
5x50mm 5x50mm
Markpoint.
Secure.
Drill a hole 5.2mm diameter.
2. A drop of C/A glue on the wheel collar
screws will help keep them from coming lose
duringoperation.
Repeat the process for the other wheel.

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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Secure.
1. Slide the fiberglass cowl over the en-
gineand lineup thebackedgeofthe cowlwith
the marks you made on the fuselage.
COWLING.
Top side
1. The blind nuts are already mounted in-
side the fuselage.
INSTALLING THE MAIN LANDING GEAR.
2. Theholes inthe landinggear shouldbe
to accept the mounting bolts.
3. Using the hardware provided, mount
the main landing gear to the fuselage.
4x15mm
Bottom side
Landing gear.
Bottom side

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
3) Slide the cowl back over the engine
andsecure itin placeusing fourwood screws.
See picture below.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaftoftheengine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening. Hold the cowl firmly in place using
pieces of masking tape.
4) Installthe mufflerandmufflerextension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
andfuel fillervalve.
Trim andcut.
Bottom side
Drill a hole 2mm
diameter.
3 x 12mm
Secure.
Machine screw.

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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Secure.
Installthe spinnerbackplate,propellerand
spinner cone. The spinner cone is held in
place using two 3mm x 12mm wood screws.
Font view
INSTALLING THE SPINNER.
Secure.
2. Mount the servo to the tray using the
mountingscrews providedwithyourradiosys-
tem.
1. Install the rubber grommets and brass
colletsintotheelevatorservo.Testfitthe servo
into the servo tray.
ELEVATOR INSTALLATION.
SERVO INSTALLATION.
Elevatorservo

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
HORIZONTALSTABILIZER INSTALLATION.
Elevator
servo
Open.
Bottom elevator.
See picture below:
262mm
12 mm

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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Elevator control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
ELEVATOR CONTROL HORN INSTALLA-
TION.
Secure.
3 x 10mm
. 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 bottomofthestabilizermountingarea
and to the stabilizer mounting platform sides
inthefuselage.Slidethestabilizerinplaceand
re-align. Double check all of your measure-
ments one more time before the epoxy cures.
HoldthestabilizerinplacewithT-pinsormask-
ing tape and remove any excess epoxy using
a paper towel and rubbing alcohol.
Control horn of elevator.
Bottom side.
A+B EPOXY
PLUS glue
Elevator
control horn

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BO-209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
Elevator
pushrod Elevator
pushrod
Secure.
3 x 10mm
 Elevatorpushrod installas sameas theway
of aileron pushrod.
ELEVATOR PUSHROD INSTALLATION.
1. Rudder servo install as same as method
of elevator servo.
See picture below:
Rudder
servo.
VERTICAL STABILIZER INSTALLATION.
Rudder
servo. Epoxyglue

BO - 209 MON SUN -Item code: BH122 INSTRUCTION MANUAL.
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C/A glue.
95mm
Epoxyglue
Epoxyglue
C/A glue.