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The IVO/Velocity accident I am aware of was
attributed primarily to not following the recommended torque procedures.
IVO no longer sells to applications that have large power pulses such as
those put out by a Lycoming. That is part of the reason I am using an auto
conversion.
I believe Tracey felt the reduced airfoil shape
and/or reduced pitch change of the prop root contributed to his lower
top end performance. I was hoping Tracy would jump into this discussion
and refresh my memory. If the prop root profile was the cause for his
lower performance, I am estimating this may not have an effect on my application
since I am a pusher and thrust contribution from the root area is likely to be
small. The only adverse effect this should have is on ground cooling, but
I am planning on exhaust augmenters to assist cooling.
I appreciate everyone's comments,
Joe
----- Original Message -----
Sent: Saturday, January 15, 2005 7:05
PM
Subject: [FlyRotary] Re: IVO Prop
Wendell Voto wrote:
-----
Original Message -----
Sent:
Saturday, January 15, 2005 9:56 AM
Subject:
[FlyRotary] IVO Prop
Does anyone have any experience or opinions
using an IVO Magnum Inflight Adjustable prop with a rotary? I am
considering the IVO for use with my Velocity / Renesis and would
appreciate any coments.
Thanks,
Joe
Joe, don't know how the IVO
prop is with the rotary engine, but it definitely is not recommended for a
Velocity (or any pusher) with a Lyc. engine. I suspect that the wing
turbulence is too much for the IVO prop. A Velocity crashed and
lost the whole family a while back using the IVO prop if I correctly
remember. My 2 cents.
Wendell
Hang on... The
velocity crash if I remember the story correctly was the result of not using
the right tools and procedures. The prop was disassembled/reassembed for some
reason and was not torqued properly. While I am no longer a big fan of IVO, I
do believe in casting a fair glance at the product. That crash was more the
result of user error than of an inferior prop. The problem with high hp
lycomings apparently has to do with the power pulses the engine
develops.
Dave
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