The simultaneous launching of multiple model rocket engines presents a great challenge for modelers. Existing methods of ignition have several disadvantages; Perekrest does not allow you to launch multiple missiles for a short time (as the products of combustion clogging the tubes, burn the ends, etc.), as currently practiced method of ignition with the banks is a danger of explosion engines because of the filling of channel MRD pyrotechnic compositions.
Last spring I made myself water skiing. But to slip on them could rarely, as the role of the tug performed… a motorcycle with a sidecar. The construction of special boats would require a certain cost, powerful engines, and most importantly – time.
This machine is not only powerful and roomy I was able to fairly compactly arrange all of its aggregates, making the frame left plenty of room for the passengers and even any cargo, including bulk or lengthy — it is a body of 250 kg, the trailer for 1 ton and wheeled console.
Model submarine class EATING has always been one of the most interesting, especially for juniors. Such “free-floating” model require from the constructor of ship models awareness of the ships are prototypes, ability to work with the most modern materials and equipment, knowledge of basic fluid dynamics, electrical engineering and electronics.
Igor Sikorsky, an outstanding Russian aircraft designer and industrialist, was one of the pioneers of aviation in Russia. Characteristically, the first aircraft built by Sikorsky in the years 1908-1911 was the coaxial helicopters. Powerful enough engines don’t allow these helicopters to take off, but sympathy for these unusual cars he kept for life.
In the manufacture of furniture and then have to drill, cut or hollowed holes to connect the wooden piece. For this we first have to perform a large number of marking operations. To facilitate these preparatory operations will use the simplest patterns, which are easy to manufacture from thin cardboard.
Existing models of walkers have several major disadvantages: the speed of these machines is usually not more than 8-10 km/h; they move irregularly or are experiencing vibrations in the vertical plane; walking mechanisms are mutually unstable.
In addition to the rather exotic projects, such as, for example, a huge steam-powered submarines for action with the Navy type “K”, or underwater monitors of the “M”, the British Navy continued to “correct” the development of a universal underwater “Admiralty” boats long range, launched in 1908, a type “D”. We remember that the most successful boats made basically the severity of the First world war, were three series of the type “E”, built in the beginning of the war until its end. However, the designers did not intend to stop there.
The development of L-29 was started in 1955, took the initiative by a group of engineers from the Research and test flight Institute of Czechoslovakia. First flight of L-29 made the April 5, 1959 L-29 Czechoslovak is the first serial jet car. In 1961, by decision of the Soviet government for political reasons he was selected as the main training aircraft of the countries-participants of the Warsaw Treaty Organization. This decision was not fair – L-29 was lost to the Yak-30 in all the parameters was heavier on 765 kg had a 30% lower thrust-to-weight, 33% less range and less speed.
The idea of creating our “Donkey” arose almost by accident. Once the chefs gave us a written off motorcycle To the 125 without wheels. Original spare wheels we had, we decided on the first case to fit available handy motorolleri — with hubs and discs from the T-200.