Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2923300 for flyrotary@lancaironline.net; Thu, 08 Jan 2004 12:43:06 -0500 Received: from rad ([68.155.99.73]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040108174305.JLAQ1950.imf19aec.mail.bellsouth.net@rad> for ; Thu, 8 Jan 2004 12:43:05 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Cooling Date: Thu, 8 Jan 2004 11:43:08 -0600 Message-ID: <000001c3d60e$e1260f80$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C3D5DC.968B9F80" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C3D5DC.968B9F80 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Is there a danger letting the temps of the rotor housings operate at a higher temp as long as we are below the melting point by a safe margin(say 350 vs the water cooled 200-250)? Ignorance is bliss! :-) MikeJ =20 It's a nice thought, but I doubt it would be a good idea. The engine is made up of dissimilar metals (aluminum rotor housings, steel rotors) = that expand at different rates with temperature. I have to believe that the approved clearances are set to be optimum for the normal temp, which is probably about 180-200. I think I read that you start losing power = above about 180 also. The other problem may be the seals. I know the oil = temp is supposed to be less than 210 when it enters the engine, to avoid = damaging the seals on the rotors, so the water housing seals may also have the = same sort of limits. =20 =20 BTW, I can't quote any sources, or actual temps. This is all just my understanding of how it works, so please correct me if I got any of this wrong.=20 =20 Cheers, Rusty =20 ------=_NextPart_000_0001_01C3D5DC.968B9F80 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Is there a danger letting the temps of the rotor=20 housings
operate at a higher temp as long as we are below the melting = point=20 by a
safe margin(say 350 vs the water cooled 200-250)?
Ignorance = is=20 bliss!  :-)

MikeJ

 
It's a = nice thought, but=20 I doubt it would be a good idea.  The engine is made up of = dissimilar=20 metals (aluminum rotor housings, steel rotors) that expand at different = rates=20 with temperature.  I have to believe that the approved clearances = are set=20 to be optimum for the normal temp, which is probably = about 180-200.  I=20 think I read that you start losing power above about 180 also.  The = other=20 problem may be the seals.  I know the oil temp is supposed to be = less than=20 210 when it enters the engine, to avoid damaging the seals on the = rotors, so the=20 water housing seals may also have the same sort of limits. =20
 
BTW, I = can't quote any=20 sources, or actual temps.  This is all just my understanding of how = it=20 works, so please correct me if I got any of this wrong. =
 
Cheers,
Rusty
 



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