Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 610813 for flyrotary@lancaironline.net; Mon, 17 Jan 2005 18:54:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050117235334.LDED2402.imf17aec.mail.bellsouth.net@rd> for ; Mon, 17 Jan 2005 18:53:34 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Switching to Evans NPG+ Date: Mon, 17 Jan 2005 17:53:39 -0600 Message-ID: <000001c4fcef$c4afdee0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4FCBD.7A156EE0" 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 V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4FCBD.7A156EE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I have more or less committed to giving it a try. At this point I am = trying to decide upon a safe redline... Pineapple racing (rotary) uses = 250-260. After hearing your story I might start at 240 and see how things go... Heck, don't some of you guys see temps in the 230-240 range on occasion = with water/glycol mix? I think the main drawback here is that Lynn has = mentioned that you lose power above a certain temp. I'd have to check the = archives again, but I thought it was something like 180 degrees for water, and = 160 for oil.=20 =20 The most interesting usage of NPG was on the Rotax 912S that I recently sold. As you know, cylinder head temps generally run higher on air = cooled engines than water cooled, so they have to be made to run at those = higher temps (metals, clearances, etc). It would appear that Rotax kept the = air cooled cylinder head temps, but used NPG to cool them. I was told there = is no spec for coolant temp, only cylinder head temp. Interesting, but = useless to us :-) =20 You've actually got me thinking about NPG now. I've never seen water = temps over 200, even in a climb to 8500 feet at 120 mph. My temp in cruise is usually way too low, like 140. It would be nice not to worry about = boiling, or pressure. Hmmmm... More to think about. =20 =20 Rusty (still no quote for engine parts) =20 ------=_NextPart_000_0001_01C4FCBD.7A156EE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I have more or less committed to giving it a = try.  At this=20 point I am trying to decide upon a safe redline...  Pineapple = racing=20 (rotary) uses 250-260. After hearing your story I might start at 240 and = see how=20 things go...

Heck, = don't some of you=20 guys see temps in the 230-240 range on occasion with water/glycol = mix?  I=20 think the main drawback here is that Lynn has mentioned that you lose = power=20 above a certain temp.  I'd have to check the archives again, but I = thought=20 it was something like 180 degrees for water, and 160 for=20 oil. 
 
The most = interesting=20 usage of NPG was on the Rotax 912S that I recently sold.  As you = know,=20 cylinder head temps generally run higher on air cooled engines than = water=20 cooled, so they have to be made to run at those higher temps (metals,=20 clearances, etc).  It would appear that Rotax kept the air cooled = cylinder=20 head temps, but used NPG to cool them.  I was told there is no spec = for=20 coolant temp, only cylinder head temp.  Interesting, but useless to = us=20 :-)
 
You've = actually got me=20 thinking about NPG now.  I've never seen water temps over 200, even = in a=20 climb to 8500 feet at 120 mph.  My temp in cruise is = usually way too=20 low, like 140.  It would be nice not to worry about = boiling, or=20 pressure.  Hmmmm... More to think=20 about.  
 
Rusty = (still no quote=20 for engine parts)
 




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