Goddard realises after three years of unsuccessful tests that the cartridge rocket concept is too complex and that a new approach is needed. Smokeless powder solid fuels were too unstable for rocket use. Therefore Goddard turned to liquid oxygen and gasoline as propellants. On this date he bought his first can of liquid oxygen from Linde Corporation in Worcester. He had to haggle for it; the liquid form was then only a by-product in the process of extracting gaseous oxygen from the atmosphere. Goddard was charged $ 10 per 2 gallon flask, the minimum Linde would sell to him.

American NACA/NASA test pilot 1945-1966. Flew D-558, X-1, X-3, X-4, and X-5, and into space on X-15 Flights 77, 90, and 91. Killed in 1968 when the F-104 he was flying collided with the XB-70 during a photo opportunity. 3 suborbital spaceflights on the X-15, 0.5 hours in space.

Robert H. Goddard experimented with liquid oxygen and various liquid hydrocarbons, including gasoline and liquid propane as well as ether, as rocket fuel, under a grant by Clark University. He concluded that although oxygen and hydrogen possessed the greatest heat energy per unit mass, that liquid oxygen and liquid methane offered greatest heat value of combinations which could be used without considerable difficulty. But, he said, "the most practical combination appears to be liquid oxygen

American test pilot astronaut 1959-1963 and 1997-1998, later a politician and US Senator. First American in orbit on his first flight, Mercury MA-6, in 1962, and oldest person in space on his second flight, STS-95, in 1998. 2 spaceflights, 9.1 days in space. Flew to orbit on Mercury 6 (1962), STS-95.