It must be said that Goddard had achieved success with gyro controlled rockets and it is of interest to compare progress during this exciting period. The American engineer began in 1932 by fitting a 4 in gyro with its spin axis on the rockets longitudinal axis. The spinning gyro maintained its vertical axis and when the rocket tilted 13 degrees from the vertical, electrical contacts were made to supply righting forces: one of four aerodynamic vanes opened and, at the same time, one of four metal diflector vanes was insertrd into the rocket exaust. Although the first launch on 19 April 1932 was marred by the rocket motor losing thrust, so that the rocket climbed only 135 ft, it was sufficient to show the effect of gyro stabliser. When the launch crew reached the spot were the rocket had come down, they found the exaust deflector warm to the touch, proving that they had operated. In subsequent years, Goddard made further progress with automatic stabilisers. One of his rocrets, launched on 8 March 1935, had a simple, pendulum substituting for a gyro which gave corrective signals when the flight path deviated more than 10 degress from the vertical. The rockets reached a speed of 700 mph and came down. Later the same month a 14*8 ft rocket reached an altitude of 4,8000 ft and travelled 13,000 ft at an average speed of 550 mph. It was controlled by a gyroscope working vanes in the exhaust: In the summer of 1937 he succeeded in flying a rocket with gimballed to an altitude at 2,055 ft, although the flight was marred by the parachute opening prematurely. The 18*5 ft long rocket had moveable tailpiece steering, wire bound tanks, and carried a barograph. In 1939 two flight trail were made of a small ramp launched pilotless rocket aircraft, and in 1940 the RP-318-1 glider flew with a pilot at the controls.