The Direct Measurement of Engine Power on an Airplane in Flight with a Hub Type Dynamometer
This is a 1927 NASA technical report, from the NASA Technical Reports Server collection, describing a method for measuring engine power on an airplane in flight with a hub-type dynamometer. The photographs show the hub apparatus, its parts, the recording instruments in the cockpit, and the installation on a modified DH-4 biplane, giving a designer a record of early aircraft engineering equipment seen in close, plain detail with mechanical textures and grey tonal contrast.
