Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2589943 for flyrotary@lancaironline.net; Mon, 22 Sep 2003 21:37:37 -0400 Received: from rad ([68.212.12.251]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030923013736.WHGM24914.imf16aec.mail.bellsouth.net@rad> for ; Mon, 22 Sep 2003 21:37:36 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Some turbo thoughts from a pro .... Date: Mon, 22 Sep 2003 20:37:39 -0500 Message-ID: <00bc01c38173$4669b220$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00BD_01C38149.5D93AA20" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00BD_01C38149.5D93AA20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Charge-air temps are EVERYTHING. The flying rotary turbo guy should = measure his. As you might imagine, 30-inches of MAP at 80F degrees is not at all = the same thing as 30-inches of MAP at 140-150F degrees. That's a pretty = typical output temp for a well-matched turbo. So yes, intercooling is a MUST.=20 Speaking of temps, I meant to ask about the calculations. What would be = the theoretical loss of available power between 30" MAP at 90F, and 30" MAP = at 167F? I attempted to calculate this, and came up with only having 88% = power at 167F compared to 90F. I'm only about .0348% confident in this calculation though. It sounds like Finn is seeing a much larger = difference, and I've always been able to feel the diff in cars between hot and cold days. To feel the diff in a car would seem to suggest quite a bit of = power to me. =20 Thanks, Rusty=20 ------=_NextPart_000_00BD_01C38149.5D93AA20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Charge-air temps are EVERYTHING.  The flying rotary turbo guy = should=20 measure his. As you might imagine, 30-inches of MAP at 80F degrees is = not at all=20 the same thing as 30-inches of MAP at 140-150F degrees.  That's a = pretty=20 typical output temp for a well-matched turbo.  So yes, intercooling = is a=20 MUST. 

Speaking=20 of temps, I meant to ask about the calculations.  What would be the = theoretical loss of available power between 30" MAP at 90F, = and 30"=20 MAP at 167F?  I attempted to calculate this, and came up with = only=20 having 88% power at 167F compared to 90F.  I'm only about .0348% = confident=20 in this calculation though.  It sounds like Finn is seeing a = much=20 larger difference, and I've always been able to feel the diff in = cars=20 between hot and cold days.  To feel the diff in a car would = seem to=20 suggest quite a bit of power to me.  

Thanks,
Rusty 
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