THE Transcendental Model 1-G Convertiplane is now being flight-tested in the Г.S. It has rotors mounted on nacelles at the wingtips, which tilt forward after take-off to propel the Convertiplane as an ordinary fixed-wing aircraft. The manufacturers say that the Model 1-G recently flew with the rotor assemblies tilted forward 35 degrees, a new mark in convertiplane development and a big step towards the goal of 84 degrees full forward tilt necessary to convert the aircraft from helicopter to aeroplane while in flight. The makers also report that the Model 1-G has flown without vibration at 3,500 ft., and has reached a speed of 115 m.p.h. as a helicopter. The Model 1-G is powered by a 160h.p. Lycoming piston engine. Wing span is 21 ft.; rotor diameters 17 ft.