Wind Tunnel Tests on Autorotation and the "Flat Spin." (1928)
NASA Technical Reports Server (NTRS) · leaf 5
all rotary disturbance causes stable autorotation. APPARATUS AND TESTS Three airfoil profiles were used in the tests. These were Gottingen 387-FB (flat bottom), R. A. F. 15, and N. A. C. A.-Ml. Rectangular wings, 5 by 30 inches FIG. l.-Biplane mounted on autorotation apparatus Pl^H, having theSC… … from rest. Fig. 2,—Mouoplaue mounted ou autorotation apparatus The force tests were made on the regular wire balance of the tunnel (Reference 1). Lift and drag w^ere measured from approximately zero lift to 90° angle of attack. The biplane drag coefficients are corrected for strut drag.
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