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Perhaps you weren't subscribed at the time, but I reported on a Glasair II awhile back that uses the IVO Magnum (66" 3-blade) on an IO360 installation... he gets 245mph at full throttle 500 feet off the deck impressing the natives in Sanibel, FL. That is a factory stock prop, BTW. The Magnum has had a much different shape at the root than the rest of their line for several years now. FWIW.
<Marv>
Yes, but didn't he do some top secret voodoo magic shaping of the root end
of the blades? I'd love to have one of those, but I've never been convinced
that you can buy one off the shelf and have it perform well at high speeds.
It's been a while since I talked to IVO, or researched the subject, so
perhaps they've changed the shape in the past year or so. Anyone know? <<<
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