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.

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

Mike Collier wrote:

Paul, why are three blade props are historically slower than two blade
props.  There must be an obvious reason, I've just never heard it.  Mike

C.

I think the more blades you have the more each blade is operating in
disturbed
air. It has been tested and proven that a one blade prop is also better than
a two blade prop.

Paul Lamar

--Vaughn Mann wrote:

Paul,
I'm headed for Sun-N-Fun and would like to check out Tracy's 6  and meet
Tracy.  Can you tell me his N number or what colors his is?
Thanks, Vaughn. 

I don't know his N number off hand but the color of his airplane is red and white.
It has an US Airforce insignia painted on the side.

Paul Lamar
 
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