Assume that the rules for a particular class or contest specify a
maximum prop diameter. In general, is it preferable to use the
maximum prop diameter allowable, assuming the plane is still built to
the minimum weight allowed under the rules? Clearly you still have to
find the best prop/rubber width combination for a given prop and
airplane after the pitch has been optimized. Obviously there are other
factors to consider such as the airfoil of the prop blades, the total
area of the prop blades, the coutour of the blades, etc.
I have noticed that F1D, EZB, penny planes and so forth seem to have
very large prop diameters relative to their wing span. There is
clearly a conscious choice not to use a smaller prop diameter prop
with less width on the rubber that would allow for packing in more
turns, which, of course, is offset by the faster RPM.
So my question is, in general, is the longest duration likely to be
acheived by optimizing pitch/rubber etc. using the maximum prop
diameter allowed under the rules?
Received on Wed Sep 05 2007 - 11:43:11 CEST
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET