My hangar neighbor, Tracy Saylor, with the fastest RV6 in the world,
bought a German three blade so-called "composite" prop. 99% pure wood.
top speed went down from 243 mph to 223 mph. Klause thinks the MT is
untwisting. Tracy had his constant speed metal prop blades twisted
for optimum speed at around 250 MPH. He specified the same twist for
the MT.

Since the blades are 99% wood I find that highly plausible as the
modulas of elasticity of wood and fiberglass for that matter is rather
low. MT claims the low modulas of elasticity is necessary to help the
hub live under aerobatics conditions. This claim I buy. It does indeed
reduce the stress on the hub.

Three blade props are historically slower than two blade props
but not that much slower. Tracy re-installed his old metal
constant speed prop. He will race the airplane at Sun & Fun I think.

BTW we should be dominating air racing with the turbo rotary any day now

just

like turbo rotaries dominate import drag racing.

Also BTW Vance can you run your program for 180 HP and 200 HP
powered RV4's?

Paul Lamar

Sure - fixed pitch or constant speed prop estimates ? - Vance

Can we do both?

Paul Lamar
 
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