Izhevsk is widely known in Russia as one of the centers of the masters on the hardware and gunsmiths. And, in spite of “perestroika”, the city tries not to lose centuries of acquired knowledge and traditions and raise worthy successors. One of the enthusiasts of this noble cause — Ruslan V. Cherepnev, teacher of additional education of young technicians “planet”. Along with his students he developed and produced many original and useful designs that have repeatedly won prizes at Republican competitions of technical children’s clubs.
Design
SANI — FORWARD!
In his letter to the editor a resident of the village of Blagoveschenka of Altai Krai V. N. Ermakov calls himself a regular and faithful reader of our magazine. However, Viktor’s being modest — he is not only a reader but also an active author, “Model construction”. For nearly 20 years Viktor regularly shares with readers his innovations and technical creativity. But his ardent and constant passion aerotekhnika, in particular snowmobiles and engines to them.
BUILDING A CAR

The transmission from the engine to the wheels can be carried out on a homemade car in different ways. In practice, often such schemes:
SLED… IN A ROLL

CAR WITH MOTOR…

WHY FOOT CAR

SAILING ROVER

“ROWING” DRIVE VELOMOBILE

THE CAR LEARNS TO SWIM

BOARD AND SAIL


The sail of the windsurfer is not the only element that produces thrust, but “the wheel” for manoeuvring. The air flow at the surface and water has a lower speed than the wind at a height of, say, three meters. Therefore, the load on the sail (corresponding speed) are proportional to the height from the water level and each overlying section of the sail will receive a certain twist in relation to the underlying (Fig. 1A).