REFLECTOR: Ivo and Vesta
Scott Derrick
scott at tnstaafl.net
Thu Apr 23 18:14:39 CDT 2009
Kurt,
I wonder whats the difference in power pulses between a Chevy V6
and a Continental flat 6? Why does one hammer a prop and the other not?
Scott
nmflyer1 at aol.com wrote:
> Mike,
>
> That is good to hear! After asking me tons of questions and carefully
> considering my setup, IVO said they would provide me a prop that would
> meet my needs. I have a 76" Magnum CS. I have not put it on yet
> because I want to get my painting done first.
>
> In fact, IVO Co. called me a while back just to make sure I was happy
> with the prop.. and I have had it on the shelf for years!.
>
> Hopefully it will be the right setup for my powerplant and provide me
> service like yours.
>
> Kurt
> 340HP Aluminum 4.3L V-6
>
>
> -----Original Message-----
> From: Michael Watson <mikewatsspg at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Thu, 23 Apr 2009 11:53 am
> Subject: Re: REFLECTOR: Ivo and Vesta
>
> I've been running a IVO Magnum Electric Constant speed prop on a
> Franklin (Std Elite RG) for ten years plus. Sent back twice for check up
> and refreshing. They are tough as nails, handles FOD well and as long
> as Ivo's maintenance instructions are followed, seems to last thousands
> of hours.
>
> On Thu, Apr 23, 2009 at 8:27 AM, Andy Millin <amillin at sbcglobal.net
> <mailto:amillin at sbcglobal.net>> wrote:
>
> Hey Larry,
>
> Believe it or not, I did a fair amount of research on the Ivo. I
> wanted to use the Ivo. I gave the guy a call and we spoke for
> nearly an hour.
>
> Way back in the day Mark Machado had mounted an Ivo on a standard
> with an IO-360. He was VERY impressed with the performance. I
> believe the write up was in Velocity Views. It sounded like it
> was going to be better than sliced bread AND peanut butter. It is
> a real performer, great price, etc.
>
> Ivo’s blades are very light. The prop is amazingly light. This
> is a blessing and a curse. The prop does not have enough mass to
> absorb the significant torque thrashing a big bore aircraft engine
> produces. In his own words “you could see the prop was just being
> tortured.” At low RPM it was possible to see the blades flexing
> length wise as the amazing shear forces were hitting the base.
>
> The blades are tough and as far as I know they never failed. What
> did happen was the blades would shift at the base. They would
> work their way free from the bolts. Ivo compensated with a very
> specific torquing regimen combined with stainless steel foil
> marking tape on the seams. I believe this worked. However … not
> all users of the prop were as vigilant or patient as they needed
> to be.
>
> I believe Ivo called for torque the bolts, run the engine,
> re-torque the bolts, re-run the engine, repeat until the torque
> does not change between cycles.
>
> In 1997, Mark Ewart and his family were killed (Standard Velocity
> DMO-266). Please read the report yourself:
> http://tinyurl.com/dhok3m It was RELATED to the Ivo. The detail
> related to the Prop is on the second page. Reading the whole
> report is better.
>
> In the end Ivo decided to stop fighting with big bore aircraft
> engines and their violent torque curves. His props really can
> withstand 750 HP, you just have to h ave a relatively smooth power
> curve. Ivo has been a very good option for guys like Chris Barber
> running a rotary with reduction unit. Smooth.
>
> It works on the Franklin as a 6 cylinder 360 has smoother power
> curve than 4 cylinder 360.
>
> As for the Vesta. If you want to read back in the Archives, I was
> one of the first, possibly even the first from the Velocity
> community to speak with Jason Day. Jason is a very nice guy. I
> had acted as a bit of a liaison to get him to work with Velocity
> to develop a prop for us and have Velocity test the thing.
>
> A major portion of Jason’s business is automotive conversions for
> aircraft. His props have been running by-and-large on automotive
> engines with reduction units on them – read smooth power curve.
>
> Jason’s stuff looks great. I believe he has the background and
> skills to make a great prop. Problem is, he didn’t have ANY
> experience with our prop running on an aircraft engine. Velocity
> wanted to help, but were unwilling to risk Turbo Charlie $200K+
> aircraft and a pilot on a completely untested prop.
>
> Velocity suggested that Jason give the prop to testers in the
> Airboat industry and let them beat on it for a year. I don’t
> believe Jason was willing and I’m pretty sure this has never been
> done.
>
> Bob Buls owns one of Jason’s props. Bob is also going to run it
> with one of Jason’s automotive conversions.
>
> Dave Dent has a prop and has been working with Jason on it. I
> sincerely wish Dave the best of luck on his flight testing and am
> eager to hear his findings. This could be a great new option for us.
>
> The other concern on the Vesta is the weight. It is a heavy
> prop. I believe it might weigh 50 to 100% more than the MT or
> Aero Composite.
>
> Please form your own opinions based on your own direct research.
> For my soft pink body, I’ll wait for someone else to strap one on
> and hit the wild blue.
>
> Andy
>
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>
>
>
> --
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> Dual GRT EFIS Synthetic Vision
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