sentences:  The man-lifting kite and glider program of 1961 forward also produced the Paresev and gave a wing that was to be used in popular hang gliding.Tony Prentice of UK at age 13 in 1960 made a flexible-wing-framed hangglider with rope controls without reference to the Rogallo-wing developments of NASA.Barry Hill Palmer made several Rogallo-winged hang gliders for free-flight kiting.