X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 27 Mar 2006 00:39:24 -0500 Message-ID: X-Original-Return-Path: Received: from smtp110.sbc.mail.mud.yahoo.com ([68.142.198.209] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with SMTP id 1047319 for lml@lancaironline.net; Sun, 26 Mar 2006 12:51:56 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.209; envelope-from=elippse@sbcglobal.net Received: (qmail 30236 invoked from network); 26 Mar 2006 17:51:07 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@71.148.2.97 with login) by smtp110.sbc.mail.mud.yahoo.com with SMTP; 26 Mar 2006 17:51:07 -0000 X-Original-Message-ID: <000b01c650fd$dc7682a0$61029447@Computerroom> From: "Paul Lipps" X-Original-To: Subject: musings on overspeed X-Original-Date: Sun, 26 Mar 2006 09:51:07 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C650BA.CDC42200" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C650BA.CDC42200 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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! ------=_NextPart_000_0008_01C650BA.CDC42200 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Biplane racers at Reno often run up to 3500 rpm = on their=20 IO-360s. I've always been under the impression that it was the prop that = needed=20 a look-over after an overspeed, since CF goes up with the square of = rpm.=20 It's hard for me to imagine that the valve springs would start to float = under,=20 say a 30% overspeed from 2700 rpm to 3500 rpm. A lot of helicopter = IO-360s and=20 IO-540s operate in the 3000s! Even the little=20 supposedly stock O-200s in F1 turn up to = 4500=20 rpm!
------=_NextPart_000_0008_01C650BA.CDC42200--