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There seems to be some misconceptions about the IVO prop. Since I own an IVO Magnum three blade prop(72" dia. in flight adjustable from 45" to 105")I can tell you that in the "relaxed position" the blades are in the center of their travel at about 75". They can be twisted both positive and negative about 30" from this position. While their early versions did have a tendency for the blades to shift position in the hub, IVO has modified the hub by knurling the surfaces for a better grip on the blades. This has apparently solved this problem. IVO now sells an electronic governor for $300 to convert the in flight adjustable to a true constant speed prop.
Although my project is not quite flyable yet I have run the engine/prop on the ground and am impressed with its smoothness. Hope to be flying this spring.
I chose the IVO based on Dave Atkins' recommendation (he has been flying with his for about 8 years now)and the number of other aircraft at Oshkosh using the IVO.
I will update when I get airborne.
Jim Maher
13B/Dyke Delta JD-2 project
--- Original Message ---
From: Rick Girard <fly.ez@verizon.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: props
Just MHO but Ivo should have made their prop so that it twisted to flatten the pitch for take off and relaxed into the cruise position. The rotary has enough power for most of the airframes builders talk about installing it in, that a minor degradation of in takeoff and climb could be offset. Let's face it, cruise performance is where the rotary can make up for its high BSFC. I'd much rather go from 1000 fpm to 800 fpm climb than lose that 10 knots at cruise. If I do get the cruise lose I'd rather it came from my hand on the throttle. I save lots of money by using 65% power, our club charges by tach time.
Rick Girard
Homepage: http://www.flyrotary.com/
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