Early-to-1799 1800s 1900-1939 1940s 1950s 1960s 1970s 1980s 1990s 2000s
Consider copy-paste one of these in the Keywords field:
When we take our training flight and are told to just hang from our trim hang point and let go of a hold of the frame, then we can know our connection with George Spratt and his legacy for us.
Patent number: 2463135
On August 15, 1948, the Rogallos successfully
flight tested their flexible kite. Francis Rogallo would be on a long path of
leadership showing and telling about his flexible wing. His patent foresaw
stiffening and inflating while the principles of the flexible wing would still
work within such stiffenings. Sputnik in 1957, would drastically give thrust to
Rogallo's role in furthering the limp and stiffened wing; In late 1950s, the
four-boom standard Rogallo-influenced kite-glider would spawn projects in many
sectors; following each sector shows a vast array of understandings. The
standard four-boom foldable wing would kite gliding for Ryan, for Paresev, for
wind-tunnel studies, for public citizen amateur projects; such tool found its
way to foot-launch hang gliding in Barry Hill Palmer and James Hobson before
the end of 1961 and 1962 respectively. And Thomas H. Purcell would use the same
4-boom standard Rogallo wing kite-glider over waters launched by motor boats in
late 1961 and throughout many years following. Rogallo would have two flight
sessions years apart in Purcell's Rogallo-influenced kite-hang-gliders.
In 1962 the Hobson project would be splashed nationally with some international
audience in Sport Aviation and on Lawrence Welk Shows (television popular
show). The ancient triangle control frame in 1950-61 was starkly used by John
Worth; James Hobson would use the same triangle control frame in his 1962
foot-launchable hang glider; the editor of Sport Aviation wrote without a wince
or pause: Rogallo Wing Hang Glider while featuring the Hobson hang
glider. All such art was part of the global mechanical public domain available
to all, especially those skilled in the arts. Notice how many scores of men
knew about such arts by July 29, 1963; actually, in Breslau 1908 at a sport
hang gliding meet in the first decade of 1900s, a dark-flexible-sailed
foot-launch hang glider with battens was featuring the cable-stayed triangle
control frame with pilot hung from keel ---thus all the mechanical arts
employed later in the standard Rogallo hang glider which was sharper in lines
because of the deep work done at NASA and Ryan and picked up by amateur
tinkering athletes. What was left was simply cleaning up artistic lines for
products. But a naive guy tried to get a mechanical patent on what
belonged to the Public already; he failed, but a bully has been pressing such
untenable case in the 2000s only to make more silly the faulty claim of
invention for what was already out for all. The party of historical
clarity continues to delight many when they come home from a day of flying.
Often missed is "Dr." Rogallo's insistence that a fully flexible wing lived in reality below all stiffening manners, and that the "Rogallo wing" was able to be known at a minimal interface with matter and energy; and then once it is discovered, that Rogallo wing could be used in every level of stiffening imaginable with confidence that a useful degree of stability and control would be at hand for humans for their products. Though "Rogallo-wing-using" items existed in inventions and objects before Francis Rogallo, the users had not identified the underlying "wing" as they used what Francis and Gertrude would prove existed and was able to be used from fully flexible format to even rock-solid formats.
With their finding and then leadership in NACA and NASA and over 24 related patents, they could be seen validly as founding modern flexible wing hang gliding. The "delta" thing was before Rogallo, but the Rogallo wing was not realized before the Rogallos. The consultations and further research into hundreds of models and versions of Rogallo-wing using aircraft, kites, gliders, trikes, etc., posited Gertrude and Francis as the "parents of modern hang gliding" in most hang gliding communities found in the literature.