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Date: Sat, 15 Jan 2005 23:25:34 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: IVO Prop
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Other Velocity folks have compared Catto props with $12k CS units.  CS 
prop beats Catto on takeoff, but Catto cruises faster.  No way is an IVO 
going to out perform the CS units.  I would guess you'd lose a lot of 
cruise compared to a Catto and not gain enough takeoff performance to 
justify the expense and tension of always wondering how those blades are 
doing.
My .02 ... Jim S.

Bryan wrote:

>  
>
>     The major problem with the IVO and Lyc engine combo is the heavy
>     power pulses.  It uses separate blades clamped between plates and
>     the heavy low frequency pulses WILL cause the blades to become
>     loose.  (IVO will no longer sell for installation on any four
>     cylinder aircraft engine)
>      
>     Use of the IVO with the rotary should not pose a problem as the
>     power pulses overlap and at a much higher frequency.
>      
>     Tracy used an IVO and as far as I know, the only reason he stopped
>     using it was due to the performance.  According to Tracy the IVO
>     climbs like mad but does not perform well over 150 mph.
>      
>     Bryan
>
>         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
>          
>
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