GRAUPNER BO 209 MONSUN Instructions Manual

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

1

Re: Order No.9355

9355.M

Instructions

BO 209 MONSUN

For internal combustion motors up to 33 cm³

and

electric motors

Requires a HoTT radio control system with 5 functions

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

2

Specification
Wingspan about 2200 mm
Fuselage without spinner about 1660 mm
Wing area about 62 dm²
Tailplane area about 12 dm²
Wing area about 74 dm²
All-up weight depending on equipment about 7700 g
EWD 0-0.5 degrees
Centre of gravity about 100 -110 mm behind the leading

edge

Caution: This model is not a toy!
If you do not have experience with such motorised models, please ask experienced
model flyers for help. If the model is operated without the proper knowledge, injuries
can result. Think of your health and safety.

Important! Before you start the assembly!
Even if you have already built lots of RC models, read these instructions through
carefully and check the parts in the kit for completeness. A lot of effort was made to
keep things as simple as possible without neglecting safety.

Note on the covering sheet
Because of strong changes in the weather (temperature, humidity, et cetera), small
creases can form in the covering sheet. In rare cases, the components can even be
warped. This lies in the nature of wood construction with covering sheet. This can be
corrected as follows using a hair dryer like those available to model builders.
Creases: Blow with hot air and rub with a soft cloth.
Warped area: Gently twist the area against the direction of warping and smooth

it out again using hot air.

Caution! Never use more heat than is absolutely necessary. If the iron is too hot, the
covering sheet will melt and holes will form.

The extensively pre-fabricated model can be built in a very short time. However, the
remaining steps are important and have to be carried out with care. Doing this work
properly determines whether the model will have the prescribed rigidity and flight
characteristics; so please work slowly and precisely!

When putting screws into wood, secure them against loosening by using
casein glue: Squirt casein glue into the drill hole and screw in the screw.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

3

Tips on building the model

• Before assembling the model, it is essential to read the construction diagram and
the instructions all the way through. When using tools, be aware of the possible
dangers.

• Use only suitable cables that are adequate for the electrical currents that occur
during operation.

• Set up the receiver aerial as far as possible away from the cables carrying the
operating current (at least 3 cm).

• Clean residual grease from all connections that are to be glued. This can, for
example, be done through sanding and using a non-relubricating cleaning
solution. The same goes for the surfaces to be painted, in order to make sure that
the paint sticks. Before gluing parts, always roughen the corresponding surfaces
(especially for GRP fuselages) carefully with fine sandpaper and de-grease them
thoroughly, for example with acetone. Otherwise, adequate adhesion is not
assured.

Other required accessories

Internal combustion motor and accessories

Recommendations for internal combustion motor

Motor
Order No.

Capacity
cm³

Propeller
Order No.

Petrol motor
GT 33

2772

33

45x25 cm

1314.18x10"

Recommendations for electric motor

Electric
motor
Order No.

Propeller
Order No.

Drive battery
Order No.

Speed
controller

Order No.
COMPACT
740 Z

7780

45 x 25 cm

1326.22x10

LiPo 3/5200

18.5/5.2Ah

9752.5

COMPACT

CONTROL

90S

7228

Radio control system
It must have at least 5 control functions and 9 servos. Furthermore, the
transmitter must be capable of servo rotation reversal.

Particularly recommended: Computer-System from MX-20 to MC-24. Servos with
standard dimensions can be installed.
As receiver battery, we recommend: Receiver battery LiFe 2/2900 6.6V JR Order No.

7672.2, which has to be carefully serviced before and after all flight operations. The

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

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capacity of the rechargeable battery can be checked with Graupner Battery GUARD
Order No. 7599. See also the insert included with the battery.

For the connection of the two ailerons and the landing flap servos to the receiver,
extension cables Order No. 3935.18 are required.
Each of the two aileron servo cables needs an extension cable, Order No. 3935.50;
the two landing flap servo cables Order No. 3935.18; the elevator servos Order No.

3935.50; and the bow landing gear servo Order No. 3935.50 for extension.
Receiver and battery: Store in foam material.
Any servo of standard size and an adjusting power of about 50 Ncm can be installed.

Adhesives

Epoxy glue, for example UHU plus schnellfest, Order No. 962
Epoxy glue, for example UHU plus endfest 300, Order No. 950.43
"UHU Holzleim express" casein glue, Order No. 958.60
UHU hart, for example Order No. 534.35
Fast setting glue, for example Order No. 5821
Fast-setting (cyano-acrylate) glue, such as Order No. 5822
Thread lock fluid, for example Order No. 952

Accessories for operation (not included)
Fuel, depending on the motor petrol/oil mixture (see instructions for the motor used)
Fuel hose, for example Order No. 1325.2
Manual fuel pump, for example Order No. 6870
Ignition battery, Order No. 8716.5

Charger cables and chargers for electric aircraft
Required tools (not included)

Various (Phillips) screwdrivers, needle-nose pliers, flat-nose pliers, wire cutter, balsa
knife or razor blade, various drills, pencil, felt marker, soldering iron with fine tip.

Assembly of the BO 209 MONSUN

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

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Wings - tailplane and rudder

Do not begin the assembly until you have familiarised yourself with the components
and the individual construction stages. If you are not satisfied with any component,
report it to your retailer before you start the construction process.
Using sandpaper or sanding block, sand the control horns on the surfaces to be
glued in order to achieve an adequate connection when gluing.

As seen in the photos, unstick the slots in the ailerons, landing flaps, rudder, and
elevators for the GRP control horns; put a dab of glue into the slot, and push the
control horn in until it stops.

Wipe off any excess glue.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

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Until the glue hardens, the servos are installed in the corresponding mounts and
fastened into the wing or tailplane.
Extend the servo cables with the corresponding extension cables and secure them
against loosening, for example using a piece of heat-shrink sleeve or a drop of fast­setting glue. Using the RC system, bring the servos in the middle position and install
the servo levers.

Fasten the servo to the attachment block using the screws included with the servos.
To do so, insert the rubber grommets with the brass hollow rivets, collar downward,
into the servo flange. For drilling Ø 1.5 mm holes for the screws, the hollow rivets can
be used as a drilling template. To make it easier to push them in,
the hollow rivets can be placed onto a screwdriver of the proper size.

Now the servo cables are pulled into the wing halves and tailplane halves using a
thin string. Just behind the connector, tie the string to the cable and pull it in so that it
comes out the wing root.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

7

With servo and rudder in neutral position, screw together the lengths of the rods for
the ailerons, landing flaps, and elevators, adjust them, and use thread lock fluid (such
as UHU schraubensicher) and lock nuts to secure them against loosening.

As shown in the photo, secure the hinges for the landing flaps using heat-shrink
tubing.

On the underside of the wings, there are markings indicating where the flap hinges
can be screwed in. Make sure that the axes of rotation of the hinges are all the same
distance from the trailing edge of the wing.
As shown in the photo at the left, a screw is used to fix the hinges in place; then use
an engineer's square or geometric protractor for alignment with the trailing edge, and
fasten the hinges with two more screws. Now push the landing flaps up against the
wings and tape them in place temporarily; align them, and fasten them with screws.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

We reserve the right to introduce modifications. Not liable for printing errors!

12/2011

8

Screw the pushrods together as shown in the following photos.

Adjust the transparent covers of the wing tip lights and use transparent adhesive film
to attach them to the wings.

The bolts used to secure the wing are screwed into the corresponding holes in the
wing roots. Use UHU schraubensicher thread lock fluid to secure the bolts against
loosening.