Operators and engineers watch and operate controls as airplane propellers are tested in a wind tunnel in United States.
United States USA Date:1944 Duration:1 min 23 sec Sound:Yes
Airplane propellers are tested in a wind tunnel in U.S. In a wind tunnel men work at the propellers of a plane. The propeller rotates. Operators look from the windows in the tunnel. A man walks into the wind tunnel and looks at the controls. Operators and engineers watch and operate controls. Operators study the motion of the propeller in the dark. A lady walks in the front of the tunnel. Her hair blows towards the tunnel.
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