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TN D-1255 for study.
Some pages are charts. Some pages all text. Some pages:
The document is in public domain. The fundamental hang glider mechanics involved were also already in public domain in 1962 along with the single-point hang, pendulum weight-shift control, A-frame for control of payload positioning, and for any sort of payload or size of hang glider or for powered the hang glider, inhabited or not. The mechanics of the simple standard hang glider were exhibited in Breslau in 1908 with the A-frame cable-stayed with hung pilot grasping the control frame for foot-launch hang gliding; such most-simple control system is even used today in hang gliders and powered hang gliders. We thank those who contributed to the public domain over the centuries. In 1960-61 John Worth designed, built, and flew many versions of the triangle control framed four-boom Rogallo-influenced hang gliders and even powered them. Ryan Aeronautical had scores of people advances the study of the hang glider unpowered and powered. In 1962 Barry Hill Palmer, Thomas H. Purcell, Jr., and James Hobson would show citizen projects of hang gliders using such public domain art.
Over a year later late in 1963 an partially unaware tinkerer would attempt without success to patent the public domain mechanics while he adapted the Ryan research aircraft Rogallo-affected wing while ending up essentially mechanically duplicating the 1908 Breslau control system; then about 50 years later a friend of his passionately pushed untenable claims into hang gliding orgs' merit systems; all self-respecting hang glider participants are called to have the global-intended "Inventor" aspects and some other untenable "invention" claims erased from the core of the hang gliding sport and rather support deep gratitude for the body of public domain arts formatted by a century and more of workers on the flexible-wing hang gliders; as one might care, appeal to the F.A.I. for altering the text on the matter.
The hang gliders may be powered when wanted; and the same vehicles may be long-lined towed as wished; such is ancient kiting arts which are obvious and thus non-inventive once such arts were deposited into the public domain.
Discussion of text of the technical note TN D-1255 is invited to be
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