brian(at)lloyd.com
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 Posted: Fri Jul 20, 2012 10:24 am Post subject: prop optimization |
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Optimizing a prop for a given aircraft is a real challenge. If you think about it, the blade shape and twist will be optimized for only a single RPM and true airspeed. (Yes, I wrote that correctly when I said true airspeed as it is true airspeed and RPM that determines angle-of-attack of the prop blade.) Efficiency drops off on either side of that. An aircraft that operates at a higher TAS will need a different amount of twist and possibly a different airfoil selection. In fact, the airfoil needs to change along the length of the blade due to the different operating characteristics from hub to tip.
So a prop that is optimized for the Yak-52 will not perform quite as well on the CJ6A and vice-versa. Sure they will work and variable pitch (constant speed) broadens the useful range, but if you want a prop that optimizes performance and efficiency, you need to deal with the specific characteristics of the specific aircraft.
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Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian(at)lloyd.com (brian(at)lloyd.com)
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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