Bo 209 Monsun (oz7445)

About this Plan

Bo 209 Monsun. Rubber scale model. Wingspan 545 mm.

Planfile includes detailed build instructions, in German.

Quote (google-translated): "The original: The low-wing Bo 209 MONSUN is a fast sports and touring aircraft and is manufactured by the Messerschmitt-Bölkow company.

Single-engine cantilever low-wing aircraft. Suitable for sports, touring, training and aerobatics as well as glider and banner towing. The wings can be folded, so they take up little space when stored. With the wings folded, the aircraft can also be transported on the road behind a car. The Bo 209 MONSUN has a robust, rigid main landing gear with covered wheels and an electrically retractable nose gear. The tinted plexiglass hood can be moved to make boarding easier. There is room for two people in the cabin.

The model: General: Balsa wood is mainly used to build the rubber-engine Bo 209 MONSUN model aircraft. The flight characteristics are very good, the model aircraft is beautifully designed and largely corresponds to the full-size model. The detailed quick-build plan and the instructive exploded view as well as the construction stage photos make construction much easier. The finished plastic parts, such as the engine cover, canopy, propeller with bearings and wheels with wheel bearings, help to shorten the construction time.

The profile-shaped wing halves are remarkable; they enable good flight performance.

All balsa parts are carefully cut out of the boards with a sharp balsa knife or razor blade. Do not break them out under any circumstances!

Attention! For the fuselage side parts, note the important note in the following section. The balsa parts must be deburred and fitted or adjusted. The burrs on the plastic parts are removed with a sharp knife. The kit contains glue that is suitable for gluing both the wooden parts and the plastic parts. For further coloring, use SPANNFIX Immun, ALKYFIX enamel paint and UNIVERSAL paint.

The assembly instructions explain the assembly in the order of the individual part numbering. A flat board that is straight on all sides is required for the assembly. To prevent it from sticking, it must be covered with an adhesive-repellent film.

The fuselage with horizontal and vertical stabilizer Glue the lining (2) onto the nose gear frame (1), insert the nose gear wire (3) and part (4), and glue it. Then glue on the cover (5) and stiffener (6). Pin everything in place with pins until the glue dries. The frame (7) is reinforced by the two parts (8), frame (9) by the two stiffeners (10).

Important: Before the two fuselage side parts are separated from the boards, place them on the workbench with the printed side facing down and use a soft pencil and a ruler to transfer the position of the frames to the back of the fuselage side parts from the side cutouts.

Now attach the right fuselage side (11) to the construction board with the printed side facing down and glue the frames (1), (7), (9) at right angles to the places marked with a pencil. Check with a right-angled set square or similar. Maintain the distance between the two frames (7), (9) from each other (wing width)! Glue the left fuselage side (12) on so that the front edge is exactly above that of part (11). Check with the set square applied. This construction stage is shown in Fig. 1. Then glue in the corners (13) and support (14). Leave the front fuselage side panel from (11) to frame (9) tacked to the construction board, lift the end of the side panel and support it with the base (U), right at the end.

Now glue the rear lower planking (15) and tack it in place. Pull the left fuselage side panel (12) down, apply glue to the edges and connect it to (15), also tack it in place. You can see this construction stage in Fig. 2. After the glue has hardened, remove the fuselage from the construction board and glue the plastic engine cover (16) on. To do this, carefully bend the two fuselage side panels together at the front..."

Update 22/8/2024: Replaced this plan with a clearer copy, thanks to Gianni, Pino.

Direct submission to Outerzone.

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