Ben Schneider wrote:

    I am getting close to the point where I need to buy a prop. I am
thinking  MT electric constant speed (though nearly $10,000 UG!) I am
putting a Renesis in with Tracy's RD1C. My knowledge on props is where

to

bolt them on, and not much more than that. Any suggestions. Any

suggested

questions I need to ask the prop manufacturers at Oshkosh. Bruce
Turrentine has quoted the engine approx 225HP @7500. It is going on an
RV7. What else am I going to need to know? What brand of fixed would

you

recommend if I went that route, and why?
   One final thought I had, put a fixed pitch on at first, then move

into

a constant speed later on. Good idea, bad idea??

Paul Lamar responded:

A constant speed prop will cover a lot of sins :) As I recall the RD1C
is 2.85:1 is that correct?. If so 7500 RPM is doable. Good idea asking
the prop people at OSH. Just say max RPM is 2600, 220 HP and type of
airplane. You don't need to go through all the rotary and gear box

stuff.

You might want to mention "no significant torque excursions and no
torque reversals whatsoever."  Some of the props cannot live on 4 banger
Lycoming/Continental engines but would be fine on a Wankel (even without
the PSRU).

Russell Kent

 
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