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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] musings on overspeed
X-Original-Date: Mon, 27 Mar 2006 07:57:04 -0600
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--Apple-Mail-1--195616652
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In most casses, it's the stress on the crank that's a concern, not the=20=

prop itself.

Walter


On Mar 26, 2006, at 11:39 PM, Paul Lipps wrote:

Biplane racers at Reno often run up to 3500 rpm on their IO-360s. I've=20=

always been under the impression that it was the prop that needed=20
a=A0look-over after an overspeed, since CF goes up with the square of=20
rpm. It's hard for me to imagine that the valve springs would start to=20=

float under, say a 30% overspeed from 2700 rpm to 3500 rpm. A lot of=20
helicopter IO-360s and IO-540s operate in the 3000s! Even the little=20
supposedly=A0stock O-200s in F1 turn up to 4500 rpm!=

--Apple-Mail-1--195616652
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In most casses, it's the stress on the crank that's a concern, not the
prop itself.


Walter



On Mar 26, 2006, at 11:39 PM, Paul Lipps wrote:


<fontfamily><param>Arial</param>Biplane racers at Reno often run up to
3500 rpm on their IO-360s. I've always been under the impression that
it was the prop that needed a=A0look-over after an overspeed, since CF
goes up with the square of rpm. It's hard for me to imagine that the
valve springs would start to float under, say a 30% overspeed from
2700 rpm to 3500 rpm. A lot of helicopter IO-360s and IO-540s operate
in the 3000s! Even the little
supposedly=A0<bold><italic>stock</italic></bold> O-200s in F1 turn up to
4500 rpm!</fontfamily>=

--Apple-Mail-1--195616652--