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ElleryWeld(at)aol.com
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 Posted: Wed Oct 31, 2007 6:58 pm Post subject: Ivo Props |
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Dennis
I wasn't meaning to cause any ill feelings and I think you have taken it that way.
I usually leave my self an emergency landing exit on cross country flights and on short around the neiborhood flights there are plenty of places to put down in case that Fan behind me stops making wind for any unsuspected reason
I-95 is the whole length of our state just a real long strip and I wouldnt hesitate to put down there in any pinch because when you get away from it theres going to be a real hard long walk if you can survive the landing
Ellery in Maine
do not archive
[quote][b]
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knowvne(at)aol.com
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Thu Nov 01, 2007 6:46 am Post subject: Re: Ivo Props |
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| gaman(at)att.net wrote: | Mike,
I just shared an experience I had with an IVO and IVO's response to my inquiry about having it repaired.I don't run a IVO because it's repairable.I run it because it is the only 3 blade that meets the mass inertia limits of a B box.Small injuries like the one I described,might well be repairable.It doesn't take a muffler to destroy any prop,a 3oz spring will do.As for the rest of your assumptions,assume away.
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Not meaning to drag this out some more, but actually the IVO in 3 blades exceeds the MOI limits of the (Rotax) B box by about 40 or 50% in pretty much all the workable lengths of the blades (60" on up).
The only 3 blade I know that's under the B box limit is the powerfin B model and possibly the GSC with the wood blades.
The IVO in 2 blades is in the vicinity of the B box limit or possibly below it depending on the length of the blades.
Not too feel too bad about it tho - the Warp drive 3 blade is, last I heard, something like 2x the MOI limit of even the C box  .
Well this is all from memory, so some of my figures on this are possibly wrong......
I'm fairly sure about the 3-blade IVO tho as I measured my 62" MOI once and IIRC it was somewhere around the 4500 kg/cm2 figure for it you find around the internet.
I have an IVO medium on my 912 and that's a massive, heavy sucker (anyone know the MOI limit on the 912 gearbox?)
LS
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LS
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