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This program will calculate the performance of two-, three-, and four-bladed model
aircraft propellers. The calculation is based on correlations of actual
propeller data taken by the NACA in the late 1930's (Reference: NACA Technical Note 698).
Model airplane propeller data is not readily available and most of data that is published
is of static thrust measurements only. Actual propeller thrust is a strong
function of air speed, a fact that is not really emphasized in many of the articles published
in the model airplane magazines. At least one of the popular electric aircraft
analysis programs does its performance calculations using a static thrust
correlation. Needless to say, the performance estimates produced by this
program are not very accurate.
The propellers used in producing the data in the above referenced NACA report were similar in
design to those used today on model aircraft. In particular, the pitch angles used
during the tests cover the range of pitch angles of interest to R/C aircraft modelers.
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