The Enstrom light-helicopter, the most popular member of the F 28 series was first conceived and created by Rudy. J. Enstrom. The innovative machine climbed the air for the first time in the late 1960s. The design of the F-28 is quite basic: with an un-skinned rear fuselage, it was a two-seater with a dual-blade main rotor. Following its wake, after six months, two three-seaters ascended the air experimentally, which was followed by the unveiling of the first production model in 1963. It was propelled by the AIA cylinders (0-360 by Avco Lycoming, with a power of 134,000 watts); an added improvisation was a tri-blade rotor, a treated alloy frame and a cabin area. It also had the convenient monocoque plan for the tail-section.
1959 witnessed the foundation of the R J Enstrom Corporation in the field of creating and selling the light-helicopters. [...]