"Dave S" wrote in message
ink.net...
I am involved with the building of a velocity, and questions are flying
around about propeller choice. For in-flight adjustable, we are limited
at this time to an electric control, such as MT or IVO. Cost is pushing
our options in this area towards the IVO.

I have heard of some vibration/resonance probs with certified engines (i
believe it was a lycoming, but dont know specifics)..

And one emailer has mentioned when they used the engine on a mazda
powered a/c they were limited to 170 mph with the IVO but got 213 mph
with a cruise wood prop.

I am looking for any other experiences.. good bad or otherwise regarding
the IVO inflight adjustable props (particularly in the 200 hp range).

Experiences with any other electrically controlled props that can handle
200-220 hp would be welcome too.. but the MT is probably outside my
price range..

Dave

Dave,
Robert and Valerie Harris of "The EZ Hangar" tested some props for IVO on
Long-EZ's. They found that the IVO's could handle the O-320s ok but they
could not hold up to the beating a prop takes from a O-360 (180 or 200hp).
If you are running a six cylinder such as the Contenintal O-360 or the
Franklin, things might be different.

Suggest you call Robert. I am sure he would be glad to talk with you about
their experiment. 901-475-3686

Rick Pellicciotti