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Notes:  Link prefix with "g" is a generalized Google search.  Prefix with a "w" is a leading Wikipedia file on topic.

Books and Art

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  • hang glider

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  • (date?) VJ-11 Volmer Jensen full-control biplane hang glider.  (See 1970s for VJ-23 cantilevered monoplane)


  • Sept. 21, 1942, the founder of the Self-Soar Association and  United States Hang Glider Association was born.






  • Francis M. Rogallo itching to see the essence of wing.


    G. G. SPRATT    

    Trim your hang glider. Let go of the airframe. Let the hang glider fly itself. At that moment you may  know that you may well be flying a control-wing hang glider.

    Touch the control frame downtubes or basebar to move the winged airframe and cause the glider's wing to be altered in its attitudes.

    Patent number
    : 2623712
    Filing date: Sep 21, 1946
    Issue date: Dec 1952
    Inventor: G. G. SPRATT

  • George Spratt   gGES1  gGES2cw



Dr. George A. Spratt towed his single hang point glider on floats using a motorboat. 1929. [98][99] Such control bar was going to be fit on many members of the class of STANDARD ROGALLOS, essentially begun by Barry Palmer in 1960-61. Wind-tunnel tests and models by NASA were occuring from 1958 onwards.2007 Wills Wing Falcon 3 with Spratt-like control bar BUT ADVANCED, click through

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.

Text not available

FLYING WING Robert F. Bach

Patent number: 2463135
Filing date: May 29, 1947
Issue date: Mar 1949



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.
Study each person's aviation life in the Flex-Wing Hang Glider Gold Air Award

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     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.