The Twenty-Foot Propeller Research Tunnel of the National Advisory Committee for Aeronautics (1929)
NASA Technical Reports Server (NTRS) · leaf 14
13 THE TWENTY-FOOT PROPELLER RESEARCH TUNNEL tubes may be attached and the velocity at any point in the air stream determined without a special installation. In particular, this apparatus is used to measure the velocities in the plane of the airplane propeller. The tunnel was designed to give a… … Fig. 12 Figure 13 is a view in the test chamber during a standard propeller test. Balances, manometer and deflection apparatus are shown in operation. An observer stationed in the fuselage to control the engine and read the torque scale does not appear in this view. SOME RESULTS A considerable…
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