Thanks Kmach, Desertfox4 and Slyfox for posting that you are using and apparently pleased with the IVO medium IFA prop since I am considering trying one on my model 4-912 100hp.
I currently use a Warp Drive (WD) 70" 3 blade taper tip with nickel leading edge protection.
I am pleased with the sea level performance of the WD other than how long it takes to adjust the pitch and that fixed pitch is always a compromise in performance..
I have been warned that my WD prop may be exceeding the Rotax recommended mass moment of inertia (MMI) and causing premature damage to the gear box and sprague clutch.
So I started shopping for props with less MMI.
I am considering the Prince suggested 80" fixed pitch prop ( $2400 ) but I would need extended gear (Grove $2100. ) to get adequate prop clearance even with 29" ABW's I am already using.
Extended gear + Prince prop = $4500.
The only IFA props that I am familiar with are the IVO and the Airmaster.
Both of which heavier than the Warp but possibly less MMI due to less weight at the blade tips.
John McDean at Kitfox is a big fan of the Airmaster.
The $7000. for the Airmaster and the added 10-12 pounds on the nose of a model 4 are a concern.
The IVO medium appears to be 4 pounds lighter than the Airmaster.
With the IVO and the Airmaster I would not need extended gear thus saving $2100..
So the questions I have for the IVO medium IFA prop users.
If money were not an issue would you be flying an Airmaster?
Do the IVO medium IFA or Airmaster exceed the Rotax recommended MMI?
If so it does not seem to be a major problem.
Would the all around performance difference between the IVO and the Airmaster be worth the additional approx. $4300 ?
Thanks for your consideration.
Herman