NASA-ның Rogallo қанатты ұшқыш аппаратының тәжірибелік үлгісі

Experimental NASA glider using the Rogallo airfoil

The NASA Paresev ("Paraglider Research Vehicle") was an experimental NASA glider aircraft based upon the kite parachute studies by NASA engineer Francis Rogallo. Between 1961 and 1965 the ability of the Rogallo wing (also called "Parawing") to descend a payload such as the Gemini space capsule safely from high altitude to ground was studied. The Paresev was a test vehicle used to learn how to control this parachute wing for a safe landing at a normal airfield. Publicity on the Paresev and the Ryan XV 8 "Flying Jeep" aircraft inspired hobbyists to adapt Rogallo's flexible wing airfoil onto elementary hang gliders leading to the most successful hang glider configuration in history.

NASA experimented with the flexible Rogallo wing, which they renamed the Parawing, in order to evaluate it as a recovery system for the Gemini space capsules and recovery of used Saturn rocket stages. Under a directive by Paul Bikle, NASA engineer Charles Richard in 1961–1962 designed the collapsible four tube Rogallo wing used in the Paresev. The Paresev series included wing configurations that were tightly foldable from the nose plate for easy transport, using initially a cloth sail and later one of Dacron. Data developed by NASA in the late 1950s fed both the Charles Richard team and a different Ryan Aeronautical team that produced the Fleep. The Paresev used a cantilevered cross beam but did not use a kingpost. Note that the "paraglider" involved in the early 1960s experiments is a different airfoil concept used today in paragliding.

The Paresev 1A and 1B were unpowered; the "fuselage" was an open framework fabricated of welded SAE 4130 steel tubing, called a "space frame". The keel and leading edges of the wing were constructed of aluminium tubing. The leading edge sweepback angle was held at 50 degrees by a rigid spreader bar. Additional wing structure fabricated from steel tubing ensured structural integrity. The basic vehicle was slightly more than 11 feet (3 m) high from the top of the paraglider's wing to the ground, while the length of the center keel was 15 feet (5 m). Total weight was about On August 24, 1962, seven weeks after the project was initiated, the team rolled out the Paresev 1.

The Paresev was controlled by moving the tensionally hung pilot's and fuselage's mass relative to the position of the wing. This mass shifting was effected by tilting the wing from side to side and fore and aft by using a control stick in front of the pilot that descended from the wing above. Another version translated the same weight shift control via cables. The Paresev control pendulum weight shift control system was presaged by a published patent, an early use of the hung pilot behind a cable stayed triangle control bar in 1908 in the territory of Breslau, and then also by the "control wing" of George Spratt in the 1920s.

Paresev 1 first flight on January 25, 1962, crashed on March 14, 1962. Used a rebuilt frame from the Paresev 1, but had a control stick and a Dacron membrane wing. Paresev 1B first flight on July 27, 1962. Last flight on Feb 20, 1963. Using the fully flexible parawing or the tube stiffened paraglider of the Paresev 1A, 1B, 1C as an alternate to spacecraft recovery was deemed too unreliable upon unfolding so round parachutes for water landings were used instead. The Paresev and other flexible wing projects such as the Ryan XV 8 stopped being funded by NASA on 1965. Although Rogallo wrote about, modeled, and spoke about recreational applications including hang gliding, NASA was not in the business of applying Rogallo's family of airfoils to personal aircraft such as kites, hang gliders, and powered light aircraft. The Paresev was transferred to the Smithsonian National Air and Space Museum located in Washington, D. C. for display.