Paul Mikonis wrote:

I tried a three-bladed IVO on my Wittman W-8 using a 100 hp O-235(to obtain a
little more ground clearance and allow wheel landings).
It  was quieter. But in the approach on final carrying maybe 1500-1800
rpm had bad vibration.   I built a knife edge rig to test static balance
and it was way out.  Weight of each blade confirmed the problem.
In the heaviest blade  the torque tube used to adjust pitch was too long.
  We have a quality control problem.  Should never been shipped in
that condition.
Paul M.

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