Been gone a few days for the Lakeland RV fly-in. Ed Andersen just
departed here (Shady Bend) on his way back home.
Yes, the IVO problem on my plane was mainly related to drag around the hub
area. Worked like gangbusters up to around 140 mph then started hurting
performance.
----- Original Message -----
Sent: Saturday, January 15, 2005 8:15
PM
Subject: [FlyRotary] Re: IVO Prop
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
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html