F3B class motor glider. Drawing, description

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F3B class motor glider. Tips for a modeler

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The fuselage is glued entirely of fiberglass using K-153 tin resin. The bow compartment up to the first frame is filled with PS-1 foam plastic, in which slots are cut out to accommodate the battery and the onboard equipment receiver. From above, the compartment is closed, in addition to the lantern, also with a lid that protects the radio control elements from fuel ingress.

Steering machines are installed between the first and second, lighter, frames. Access to them from above with the wing removed is through a hatch closed by a similar cover. A powerful fairing is made under the wing, providing a wide platform for attaching the wing. The keel is glued together with the tail section of the fuselage. The lantern is made of organic glass 1,5 mm thick, has an oval hole in the left side, a fiberglass shaped muffler pipe is glued into it.

The additional loading of the model is carried out with the help of a ballast attached under the steering machines.

The wing is cut out of foam plastic using metal templates with wire heated by electric current. From above, it is covered with a layer of fiberglass 0,2 mm thick, prescribed with resin. The central part 200 mm wide is pasted over in two layers. Basswood ends have a special profile that increases the effective elongation. A duralumin motor mount is attached to the main, central rib. A cutout is made under the tank, which is closed with a fiberglass fairing along with the motor. Torsion-type aileron drive from T5X1 (D16T) tubes. Since the model has increased strength with very small dimensions, the wing is rigidly attached to the fuselage using three M4 (D16T) screws.

The stabilizer is sanded from a thick balsa plate. 8 mm and, like the wing, is edged around the perimeter with lime rails. To increase the strength of the joint between it and the keel, a fairing was made. For the same purpose, the entire stabilizer is covered with fiberglass 0,1 mm thick.

Motor glider model (click to enlarge): 1 - lantern, 2 - exhaust pipe, 3 - front (first) frame, 4 - wing, 5 - reservoir, 6 - engine, 7 - bulkhead, 8 - second frame, 9 - servos elevator and rudder, 10 - aileron drive servo, 11 - receiver, 12 - battery, 13 - cover

The radio equipment must be highly reliable and ensure accurate return of the steering gears to the neutral position. The rods from them to the rudders are carried out with increased rigidity, and backlash in control is not allowed at all. The model used equipment brand "futaba".

The engine stops with the elevators fully deflected down.

Author: E.Kozyrev

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