The Charles Richards design and use of the Rogallo wing in the NASA Paresev project resulted in an assemblage that became the stark template for the standard Rogallo hang-glider wing that would blanket the world of the sport in the early 1970s. Beyond that, the wing is designed to bend and flex in the wind, and so provides favorable dynamics analogous to a spring suspension. Flexibility allows the wing to be less susceptible to turbulence and provides a gentler flying experience than a similarly-sized rigid-winged aircraft. The trailing edge of the wing – which is not stiffened – allows the wing to twist, and provides aerodynamic stability without the need for a tail (empennage). In 1961–1962, aeronautical engineer Barry Palmer foot-launched several versions of a framed Rogallo wing hang glider to continue the recreational and sporting spirit of hang gliding. Another player in the continuing evolution of the Rogallo wing hang glider was James Hobson whose "Rogallo Hang Glider" was published in 1962 in the Experimental Aircraft Association's magazine Sport Aviation, as well as shown on national USA television in the Lawrence Welk Show. Later in Australia John Dickenson in mid-1963, set out to build a controllable waterskiing kite/glider as he admitted adapting from a Ryan Aeronautical flex-wing aircraft. Publicity from the Paresev tested-and-flown hang gliders and the various space contractors sparked interest in the Rogallo-promoted wing design among several tinkerers in order: Thomas H. Purcell, Jr., Barry Hill Palmer, James Hobson, Mike Burns, John Dickenson, Richard Miller, Bill Moyes, Bill Bennett, Dave Kilbourne, Dick Eipper, and hundreds of others; a renaissance in hang gliding occurred in 1960s. John Worth was early leader in the pack of four-boom hang glider builders and designers using public domain arts. Single-point hang was an ancient art fully demonstrated at least in Breslau in 1908 as well as the triangle control frame that would later be seen in NASA's John Worth's hang gliders and powered hang gliders. Thomas Purcell and Mike Burns would use the triangle control frame. Much later Dickenson would do similarly as he fashioned an airframe to fit on the by-then standard four boom stiffened Rogallo wing. Dickenson's model made use of a single hang point and an A frame: He started with a framed Rogallo wing airfoil with a U-frame (later an A-frame control bar) to it; it was composed of a keel, leading edges, a cross-bar and a fixed control frame.