REFLECTOR: MT Prop

[Jim Sower]

The Ivo issues would be a non issue with your rotary installation.  But 
why an Ivo?  The consensus seems to be that Catto gives marginally 
better cruise than MT, and therefore substantially better than Ivo.  Ivo 
would be better on TO than Catto, but not as good as MT.  A 13B 
installation with a 2.85:1 Redrive should produce something on the order 
of 220 - 230 hp.  Gawd knows WHAT a 20B turning 7500 rpm might give 
you.  Unless you frequent some pretty marginal airports, that much power 
should be sufficient for takeoff with a Catto and you don't have to give 
away all that cruise (and money - $$$ counts).  I would guess that a 
Catto would give you a LOT better cruise than an Ivo, and the Ivo would 
only be marginally better on takeoff.
My .02 ... Jim S.

Christopher Barber wrote:

>Andy,
>
>Even though I know of issues with IVO, are the ones you are talking about
>the ones concerning the Lyc 360/5** and power pulses?  Even though we are
>leaning away from it, Dave (my building mate) and I have not completely
>ruled out the in-flight adjustable IVO for our rotary installation.  Seems
>as if IVO has gotten a lot of bad press due to some noted incidences (that
>may or may not have been due to fault at IVO) and one of the common threads
>is that there is a noted problem with power pulses and IVO does not allow
>use on the mentioned Lycs.  Do you have "the rest of the story"?.
>
>Thanks for any insight.
>
>All the best,
>
>Chris
>started running control systems this week. Yea.
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
>Behalf Of Andy Millin
>Sent: Tuesday, March 15, 2005 10:35 AM
>To: 'Velocity Aircraft Owners and Builders list'
>Subject: REFLECTOR: MT Prop
>
>
>Tom,
>
>I believe the factory has known about MT's shortcomings for a while.  As I'm
>sure you know, there really haven't been a lot of viable options.
>
>The Catto prop is looking pretty good to me.  For the performance, the
>service, and yes, the price.
>
>I know Scott Baker has been working with Aerocomposites and with Hartzell
>(http://www.velocityaircraft.com/Velocity%20Online/Velocityonline.html)  You
>are flying, so having props in development is cold comfort.  It is of some
>comfort to know that the factory is looking out for us and is trying to find
>more options.  Thanks Scott.
>
>I have spoken with Ivo.  Due to material and design considerations it is not
>and never will be an option.
>
>At one time Whirlwind (http://www.whirlwindpropellers.com/index.shtml) did
>produce a pusher prop suitable for the Velocity.  They no longer make the
>pusher prop.  I believe there are one or two still pushing Velocities.
>
>I spoke with the people at Hoffmann propellers.
>http://www.hoffmann-prop.com/  Another German company.  Props cost as much
>as MT.  I'm not sure they make a pusher.  I didn't pursue it as I thought it
>would be more of the same.
>
>If you want to go flying today with 260+ hp in your Velocity, the sad state
>is that you don't really have many options.  MT and Catto.  If you want
>constant speed, then only MT.
>
>I'm quite certain that MT knows this; Velocity does. But short of making
>their own prop, what can they do?  They need to sell kits and they can't if
>they don't have a usable fan pusher thingy.  They recommend MT.
>
>I wish you good luck and good hunting with MT.  Any improvement in service
>or product you can get will benefit the whole community.
>
>Best,
>
>Andy
>
>-----Original Message-----
>From: Tom Martino [mailto:reflector-bounces at tvbf.org] On Behalf Of Tom
>Martino
>Sent: Tuesday, March 15, 2005 11:09 AM
>To: reflector at www.tvbf.org
>Subject: I AM A JERK (for buying an MT prop)
>
>
>Did I mention that they don't answer email regarding important updates and
>service bulletins?  There are updated seals that do not leak grease, plus
>some other key service bulletins.
>
>When you email them to ask if you serial number is affected (my prop was
>delivered December 2003) . they do not have the courtesy to answer you.
>
>If you call them . they tell you to send it in . not for the update . just
>so they can look at it. Hey do not have the decency to look something up
>while your on the phone.
>
>Do they think we all have time to pull props and ship them for the hell of
>it?
>
>I have a new mission:  To let people know about this company (and by the
>way, I have means).
>
>I believe Velocity ought to reconsider their recommendations.
>
>Tom
>
>
>
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