REFLECTOR: Ivo and Vesta
Scott Derrick
scott at tnstaafl.net
Mon Apr 27 16:34:19 CDT 2009
Alex, I think your right. Somebody else mentioned the redrive, because
it doubles the pulses and uses a belt that absorbs a lot of the pulse.
Scott
Alex Balic wrote:
> Scott,
> One thing to keep in mind with your comparison is that the V6 probably is
> running with a Re-drive- (2:1) so you have about 6 power pulses per
> revolution of the prop vs. just 3 on the 6 continental and just 2 on a 4
> cylinder Lycoming. Also- most of the PSRU's have some type of internal
> damper- mine has clutch-type springs, some have rubber shocks in there, or
> run with a belt or hy-vo chain so added up, there is a big difference, even
> before talking about balance of the engine.
>
> Alex
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Thursday, April 23, 2009 6:15 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Ivo and Vesta
>
> 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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>
>
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