REFLECTOR: Ivo and Vesta
jewen at comporium.net
jewen at comporium.net
Sat Apr 25 18:57:12 CDT 2009
About 4 years ago when I was making engine decisions I had a business trip to CA near IVO. I took an afternoon to visit his shop and talk with him. At that time he would not sell his prop to anyone with a Lycoming. One or more of his props had a problem with the owner's not properly following the re torquing procedure which lead to an in flight failure. Since that time his position was the power pulses were too great on the Lyco so he would not sell anymore to Lyco owners. That is part of the reason I elected to go with a Mazda rotary (20B)
Joe
173 RG (20B)-about a month away from first engine start and hopefully within 3-4 months of first flight.
---- Original message ----
>Date: Sat, 25 Apr 2009 18:54:49 -0400
>From: "Andy Millin" <amillin at sbcglobal.net>
>Subject: Re: REFLECTOR: Ivo and Vesta
>To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
>
>John,
>
>There are several people running an Ivo on a 6 cylinder Franklin. I have never heard of anyone running an Ivo on a 6 cylinder Lycoming.
>
>That being said, the 360 Lycoming has a greater negative pulse in its 720 degree cycle than the 540 does. Even though it has more torque, it is technically smoother power. Still, never heard of Ivo selling one for a 540.
>
>Andy
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of aminetech at bluefrog.com
>Sent: Friday, April 24, 2009 9:12 AM
>To: Velocity Aircraft Owners and Builders list
>Subject: Re: REFLECTOR: Ivo and Vesta
>
>I recall someone on the list has an IVO on a 6 cyl lycoming. IMO, IVO is being over conservative, or perhaps their insurance is the reason.
>
>John
>
>--- scott at tnstaafl.net wrote:
>
>From: Scott Derrick <scott at tnstaafl.net>
>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>Subject: Re: REFLECTOR: Ivo and Vesta
>Date: Thu, 23 Apr 2009 17:14:39 -0600
>
>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.
>>
>> Ivos 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 Jasons 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.
>>
>> Jasons stuff looks great. I believe he has the background and
>> skills to make a great prop. Problem is, he didnt 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 dont
>> believe Jason was willing and Im pretty sure this has never been
>> done.
>>
>> Bob Buls owns one of Jasons props. Bob is also going to run it
>> with one of Jasons 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, Ill 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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