Flight Tests of the Drag and Torque of the Propeller in Terminal-Velocity Dives
A 1937 NASA technical report on flight tests of propeller drag and torque during terminal-velocity dives, issued by NASA's Technical Reports Server for aeronautical engineers and researchers. The single photograph shows a U.S. Navy biplane fighter with a two-bladed propeller, its tail marked FEC-4, parked on a flat airfield in a side view that suits technical aircraft reference work.
