12 b

Paul,

I have been a silent but avid follower of your work with aviation
rotaries for several years. My project (RX8 in a biplane} goes along
sooo slowly but I can see _you_ don't waste any time. I was waiting
on Randy to provide a universal mount, but I think he is so busy
right now; perhaps I should buy the parts and do it myself with the
old empirical method.

My reason for writing is to give you a heads-up. I donated something
to Lamar Instruments.com towards the TTC Project. You spoke of a
large chord, multi blade prop that would take full advantage of the
650HP you could get at full throttle. If  Pilot Dan is up to it and
agrees, perhaps we can generate enough funds to buy or borrow that
prop.  What say you?   I think you can not only beat the record, but
can blow it right out of the water!

BTW, your math analysis is always so good; do you think you could do
a little perusing through the prop calculations to help us in
choosing the most effective prop choices?

Thanks for all you do for us amateur builders. EAA should be thanking
you profusely.

Tom Birch


That is a great offer but Dan just wants to be done with this
project. I think we can get the record with what we have.

There are so many variable on prop selection. Even the experts get it
wrong 90% of the time. The solution is ground adjustable. The entire
experimental prop industry is getting on the ground adjustable band
wagon :-)

Here is my way of doing away with the conventional prop flange and
going directly to ground adjustable prop hub.

Paul Lamar


Paul, those pictures show the smaller Warp Drive blades and pitch change blocks. Those blades are good for about 50 hp each, I would not expect them to last with the TTC engine.  Fixed-pitch props are just fine if you know what pitch and twist you want — and as you know, you don’t know those things because you haven’t really mapped out the rpm where you get the most power from the engine into the prop. The experts may know the prop but they don’t know the engine! And, just being able to change the pitch as with Warp blades or conventional controllable-pitch props doesn’t allow you to change the twist, which you may also want. But, I think a conventional ground-adjustable prop intended for STOL will probably be most practical.

David Josephson


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