Saari, Martin. J., Wallner, Lewis. E.
An altitude-wind-tunnel investigation has been made to determine the performance of a Curtiss 836-14C2-18R1 four-blade propeller on a YP-47M airplane at high blade loadings and high engine powers. The study was made for a range of power coefficients from 0.10 to 1.00 at free-stream Mach numbers of 0.30, 0.40, and 0.50. The results of the force measurements indicate primarily the trend of propeller efficiency for changes in power coefficient or advance-diameter ratio, in as much as no corrections for the effects of tunnel-wall constriction on the installation were applied. Slipstream surveys are presented to illustrate blade thrust load distribution for several operating conditions.
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