X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022060 for flyrotary@lancaironline.net; Sun, 26 Jun 2005 11:14:34 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.33; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao06.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050626151347.FUVM19494.fed1rmmtao06.cox.net@BigAl> for ; Sun, 26 Jun 2005 11:13:47 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Coolant Leak Date: Sun, 26 Jun 2005 08:13:57 -0700 Message-ID: <000001c57a61$acbd4a30$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C57A27.005E7230" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C57A27.005E7230 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, all I can tell you is that the pressure would go immediately = (within 2 seconds) to 21-24 psi. Then as the engine warmed up the pressure = would drop to a nominal 8 psi or so =20 It makes sense to me Ed. Heat the coolant just a little, and it needs = to expand just a little. In order for any of the coolant to flow out past = the cap (even just a little coolant), it must reach the pressure rating of = the cap.=20 =20 How much can the coolant heat up in 2 seconds after start? Just about = zero. The only thing that is heated a little in that time is the rotor housing walls. Maybe that reduces coolant volume. In any case, if you have any radiator hose in the system, it will expand enough to keep the pressure = from increasing that much. There is some weird science in here somewhere. =20 Al ------=_NextPart_000_0001_01C57A27.005E7230 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al, all I can tell = you is that the pressure would go immediately (within 2 seconds) to = 21-24 psi. Then as the engine warmed up the pressure would drop to a = nominal 8 psi or so

It makes sense to me Ed. Heat the = coolant just a little, and it needs to expand just a little. In order for any of = the coolant to flow out past the cap (even just a little coolant), it must = reach the pressure rating of the cap.

How much can the coolant heat up = in 2 seconds after start? Just about zero. The only thing that is = heated a little in that time is the rotor housing walls. Maybe that reduces = coolant volume. In any case, if you have any radiator hose in the system, = it will expand enough to keep the pressure from increasing that much. = There is some weird science in here somewhere.

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