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This group is open to all, intended for serious discussion of the Kasperwing Ultralight and closely related aircraft, such as the Brochocki-Kasper-Bodek BKB-1 sailplane, BEKAS sailplane, and similar tailless flying machines. This group is not affiliated with Cascade Ultralites (manufacturer of the Kasperwing ultralight), or with the website kasperwing.com. Spammers, scammers, flamers & trolls are NOT welcome.. post that crap once, and you are banned!

Steven Grossruck started it all by modifying Klaus Hill's Fledgling rigid wing hang glider with aerodynamic design guidance from the late Witold Kasper. The Kasperwing ultralight was developed circa 1980 when Steve established the company Cascade Ultralites, which produced 333 Kasperwing ultralights & kits between 1980 and 1988. Most were single-seat motorgliders designated as 180 A or B models, powered by a single-cylinder Zenoah G25 2-stroke engine. This 242cc engine generated about 22 hp at 6,600 RPM, swinging a 54x27 prop via 2.5:1 reduction drive. Its controls are unconventional, but very effective: weight shift for pitch control, and inclined wing-tip drag rudders connected to a steering yoke for turning and approach control. A unique aspect of the Kasperwing is its "mush" mode of flight, which is a very high angle of attack vertical descent with near zero forward velocity, similar to a parachute, but under full directional control. Some claim that this means the aircraft does not have a true stall, but that is arguable with competing definitions of the term "stall."

Cascade also produced some 3-axis controlled versions with movable elevons and spoilers (no weight shift) and a few two-seaters. Options included floats for operation on water, and a streamlined Plexiglas pod (enclosed cockpit).

The Zenoah G25 engine is now out of production. Some current K-wing pilots have successfully installed larger engines (Rotax 503, Kawasaki 340/440, Compact Radial MZ201, etc.), attaining impressive climb rates.

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