Can anyone give me input on the IVO prop used on rotaries?  I am considering
the Magnum electric in flight adjustable and I wonder what experience you
have had.

I saw where Tracy Crook tried one and, I suppose, didn't like it.  I am not
certain as to why...

Thanks,
Bill Bradburry

In tractor use they seem to run into a brick wall around 180 to 200  MPH
due to the flat part of the blade near the hub. A lot depends on the
size of the spinner.

Paul Lamar

You should not have a spinner on an IVO prop. You would have to remove
it to properly preflight the airplane before EVERY flight. You have to
inspect the mating of the blades and the hub on every use, to ensure
that a blade has not shifted. I am repeating what others have said, not
what I have personally verified.

Dave Staten

That would be true on a four cylinder Lycoming that has a horrible torque
pulse but the rotary is different with much less torsional vibration
characteristic. That is also the official position of IVO Prop.

Most people running them on a rotary however have no such problems.
Dave Atkins and Tom Parkes with his 3 rotor don't have that
problem as far as I know. As of last year Dave has flown to OSH
ten years in a row from the Seattle area. Tom uses a large spinner.

Here are a few torque pulse curves for rotaries and piston engines.

Paul Lamar



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