The Direct Measurement of Engine Power on an Airplane in Flight with a Hub Type Dynamometer (1927)
NASA Technical Reports Server (NTRS) · leaf 11
eet torque is 2.7 per cent. Any change in viscosity of the working fluid resulting from temperature changes encountered at moderate altitudes is well within the range of viscosities covered in these tests. The use of low-viscosity liquids, while not materially affecting the calibration, result in… … Torque, pounds -feet Fig. 11—Calibrations with various working fluids. Indicator deflections versus torque The general operation of the apparatus in flight was fairly satisfactory, with the exception that toward the end of the tests the dynamometer hub unit developed considerable vibration, which…
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