This simple and reliable model was developed in the Chisinau children’s club “Firefly” under the leadership of Alexander Pavlovich Marchenko. All modelers-beginners, writes Alexander, build a model, as an introductory homework assignment. Guys are usually taken to Firefly “crew” (two students 6-8 grades). After 5-6 consultations they finish production of two models (the second model replacement), attached on one engine, developing his start-up and adjustment. After 3-4 sessions, “crew” is allowed to the regular runs, which are held in the club type of competitions throughout the year. The members alternately play the role of “mechanics” and “pilot”.
We offer model airplane “Firefly-1”, which I think will be of interest to many beginning modelers.
“Firefly-1” is made from plywood with thickness 3-3,5 mm. weight with engine of 1.5—2.5 cm3 to about 400 Parts cut out with a jigsaw. The rear edge of the wing panels and rudder pointed, the front rounded. After processing the parts with sandpaper cover them with liquid nitrocream.
Sub plate (6 PCs) are interconnected and attached to the wing nitrocream and screws.
“Hog” control is pressed against the thread with glue to the handlebar height. To do this, it is narrow kerf width of 1 mm (for passage of a needle and thread). The model is then covered with a smooth colored paper (for children’s applications). Letters and numbers on the wing also made of paper. They mean the initials of the student and the ordinal. Paper and letters are glued with liquid nitrocream.
After complete drying to the wing thread attach bracket for a cord and tied the Elevator. Holes it is desirable to make in advance, before covering the model with paper.
The rocker control is fixed with screws (Ø 3, length 15— 20 mm) using a wing in under engine block. Don’t forget to affixing the shim of plywood.
Control rod — made of soft steel wire Ø 1,5—2 mm. Bends on it are narrow pliers at a 90° angle. Fuel tank soldering of tinplate. Copper tube Ø 3 mm. One of them supplying the engine, connected a plastic tube with an internal hole Ø 1,5 mm. Fix the tank on the model thread and four nails, an inclined driven into the sub blocks. Thread impregnated with liquid nitrocream.
Before the first launch, we recommend limiting the rotation of the swing control so that the wheel height from the average position deviated only up. This eliminates the rough “peck” models that are specific for beginners.
Before the flight the dynamometer 6-8 kg be sure to check the durability of the control system. The model is run with hands on cords of linen thread type “Mackay” with a length of 8-12 m. Flights is best done on the ground with soft grass. It protects the model during landing.
Be sure to mark the outer contour and the center of the floor with bright flags.
A. MARCHENKO, USSR master of sport, Chisinau
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