Rubber-engined aircraft model class F1G. Drawing, description

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Rubber-engined aircraft model class F1G. Tips for a modeler

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This publication contains a story about a rubber-motor model of a new class F1G, the technical requirements for which can be reduced to two main ones: the minimum mass of an aircraft without a rubber motor is 70 g and the maximum weight of a lubricated rubber motor is 10 g. Models that meet these requirements are successfully designed and built in 1997th grader Kirill SHAGIN, who in July XNUMX became the first champion of Russia in this class of models, was in the aircraft modeling circle of the Club of Young Motorists of the trade union committee of OAO GAZ.

It should be noted that the model, which will be discussed, is quite suitable for competitions of any rank - up to the championships of Russia. True, it is somewhat difficult to manufacture, so we recommend it for children who have been studying in circles for more than a year.

Now about the design of the model. The pylon is glued in a matrix of two layers of Kevlar 0,15 mm thick. The mass of the finished part is only 5 g. There is a button for fixing the timer operation, which was once described in the magazine "Modeler-Constructor" (No. 12, 1991).

The engine pipe is also molded using 0,15mm thick Kevlar hot curing resin and 0,05mm fiberglass fabric. The mass of the finished part is 9 - 10 g. The tail boom is glued from two layers of carbon fabric 0,1 mm thick, its weight is 4 g. The fuselage is detachable, the adapters are machined from D16T.

The rubber motor wing is made using balsa. The spars are pine, reinforced with carbon fabric 0,08 mm thick. The rear parts of the ribs are also reinforced with it - from the spar to the trailing edge, as well as the trailing edge itself. The wing skin is made of metallized lavsan film 0,012 mm thick.

The wing is provided with a turbulator with a thickness of 0,6 mm.

Rubber-engine aircraft model of the F1G class of the champion of Russia in 1997 Kirill SHAGIN

F1G class rubber-engine model aircraft
Propeller blade contour Ø400 with 480 pitch on R130

The setting angle of the stabilizer on takeoff (in power mode) is 2°, on gliding - 0°.

Motor boss - Gulugonov's designs. The screw diameter is 400 mm, the pitch at a radius of 130 mm is 480 mm. The rubber motor consists of 10 threads of American rubber FAN "Saplans". The maximum number of spin turns is about 500.

The model takes off almost vertically with a smooth transition to a gentle climb at the end of the power section of the flight. The operating time of the rubber motor with a spin of 500 revolutions is 35-37 s.

Author: I.Korkin

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