1931

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NACA Report 385 presented results showing that maximum lift coefficient of a wing could be increased as much as 90 percent by use of boundary-layer control.

Robert Esnault-Pelterie of France demonstrated liquid-fuel rocket propulsion with a rocket motor operated on gasoline and liquid oxygen.

Bureau of Standards made a number of experiments to determine whether thrust reaction of a jet could be increased, and tested combinations of jets.

Alexander Lippisch of Germany first produced and demonstrated a practical delta-wing aircraft.

During 1931-32: Taylor Cub Model A, a two-seat, high-wing light airplane, first produced, and helped popularize sports flying in the United States.

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