Mailing List lml@lancaironline.net Message #35047
From: Walter Atkinson <walter@advancedpilot.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] musings on overspeed
Date: Mon, 27 Mar 2006 23:10:57 -0500
To: <lml@lancaironline.net>
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:

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 look-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 stock O-200s in F1 turn up to 4500 rpm!
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