1922

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Two wind tunnels (4 by 4 foot, and 8 by 8 foot) at the Washington Navy Yard, under the direction of A. F. Zahm, made tests on naval designs, the important results of which were usually published by NACA as technical reports.

As a result of Army-Navy conference, policy established that manufacturers and designers should be invited to compete in the design and construction of military aircraft, with engineers given a free hand. The only requirement was that the airplane have military utility and have a speed of more than 190 mph.

National Aeronautic Association was formed with Howard E. Coffin elected president.

U.S. Weather Bureau first prepared a "standard atmosphere" showing the relationship between pressure and temperature based on average conditions over the United States at 40° N. latitude.

1920-22: Goddard developed and unsuccessfully tested first liquid propellant engine, using liquid oxygen, and devised small high-pressure pumps to force fuel into the combustion chamber.