TCF Triangle control frame

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We invite comment on items in this study of the triangle control frame in kites, gliders, hang gliders, and other aircraft. This study is far from complete. Much needs to be done. There is room for contributions from many others.

Expert author Michael A. Markowski in his Ultralight Aviation
Series/No. 3: Ultralight Flight, The Pilot's Handbook of Ultralight Knowledge on page 31, noted of Augustus Herring:

"In 1894, he built three or four modified, lighter weight versions of Lilienthal gliders employing a triangular "A-frame," typical of modern hang gliders."

In 1908, some 14 years after others used the A-frame in various ways in early pre-1908 flex-wing hang gliders and monoplane airplanes, in a Breslau hang glider within a gliding club, one sees featured the most simple cable-staying of a low A-frame used for grasping control of pilot-mass-position control with pilot hung from keel behind the A-frame; modern hang gliders often use the same control system.

The study herein follows the A-frame from Leonardo da Vinci through to the present day. All are invited to advance this study; send notes toward the TCF study; thanks. The A-frame in aviation ebbs and flows for various control purposes; at times as the spring-loaded landing undercarriage with wheels and skids; at other times as a pitch-only-control device; and sometimes as in Breslau as today, as a hang glider's grasp-airframe-for-mass-shifting player. The two joined queenposts live on and on and on ...