From the history of trikes

In the 70s of the XX century hang gliding, experiencing a period of rapid development, in a short time became a popular sport.  The secret of success is primarily in the simple design and unique flight performance of aircraft. But hang-gliders require a certain elevation and ascending streams for climbing. The desire of the sportsmen to expand the capabilities of hang gliders and to allow launch from flat terrain led to the appearance of hang gliders equipped with engines - trikes.

Trikes of that period featured a wide variety of schemes and layouts, search for optimal technical solutions. In the period 1980 - 1984 such decisions were essentially found, and were followed by a boom in the development of these types of aircraft.