X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3450411 for flyrotary@lancaironline.net; Sat, 24 Jan 2009 10:16:24 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta04.mail.rr.com with ESMTP id <20090124151546.VNOH2046.cdptpa-omta04.mail.rr.com@computername> for ; Sat, 24 Jan 2009 15:15:46 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: HP was : Mark's BBQ Run / 20B numbers Date: Sat, 24 Jan 2009 10:15:51 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01C97E0C.BC1AA560" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: Thread-Index: Acl9z7VKUTSYP37KS7ORbw2hEsQHlwAZi7bA Message-Id: <20090124151546.VNOH2046.cdptpa-omta04.mail.rr.com@computername> This is a multi-part message in MIME format. ------=_NextPart_000_0026_01C97E0C.BC1AA560 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Bob, you are correct 30" Hg (or 29.92"Hg) is standard day sea level ambient pressure and 15 psi is approx 30" Hg. However, normally when you are talking about boost - you the convention is that you are talking about pressure above ambient air pressure. So 15 Psi Boost = 14.7 psi (ambient) + 15 psi(boost) or if you prefer = 29.92 "Hg(ambient) + 30"Hg(boost) = 59.92" Hg Total absolute pressure in the manifold - so, Ok, shoot me - I was 0.08" Hg off in my estimate {:>). Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bob Darrah Sent: Friday, January 23, 2009 9:58 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: HP was : Mark's BBQ Run / 20B numbers Hay, Ed, I always thought 15 Psi boost was about only 30" Hg of boost-atmospheric pressure (about 15 Psi) equals only (about ) 30" Hg. Where did I go wrong? ----- Original Message ----- From: Ed Anderson To: Rotary motors in aircraft Sent: Friday, January 23, 2009 2:10 PM Subject: [FlyRotary] Re: HP was : Mark's BBQ Run / 20B numbers Should be a fire belching dragon of an engine at over 15psi, Greg. 15 Psi boost would be roughly 60" Hg of boost which at an A/F ratio of 12 (assume you would run it a bit rich at those boost levels) would give at 6000 rpm approx 550 HP burning 51 gph (more power at high rpm and boost naturally) and producing a total of 25000 BTU/Min of heat to be dumped through the radiator and oil cooler. Boy, you will produce more heat energy that gets dumped through your oil cooler (8484 BTU/Min) than my total (coolant and oil heat) entire engine puts out. Hope you have big radiators and oil cooler {:>). __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_0026_01C97E0C.BC1AA560 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bob, you are correct 30” Hg = (or 29.92”Hg) is standard day sea level ambient pressure and 15 psi is = approx 30” Hg.  However, normally when you are talking about boost - =  you the convention is that you are talking about pressure above ambient air pressure.  So 15 Psi Boost =3D = 14.7 psi (ambient) + 15 psi(boost)  or if you prefer =3D 29.92 “Hg(ambient) =  + 30”Hg(boost) =3D 59.92” Hg Total absolute pressure in the manifold – so, = Ok, shoot me - I was 0.08” Hg off in my estimate {:>). =

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bob Darrah
Sent: Friday, January 23, = 2009 9:58 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = HP was : Mark's BBQ Run / 20B numbers

 

Hay, Ed, I always thought 15 Psi boost was about only 30" Hg of boost-atmospheric pressure (about 15 Psi) equals only = (about ) 30" Hg. Where did I go wrong?

----- Original Message ----- =

From: Ed Anderson

Sent: Friday, = January 23, 2009 2:10 PM

Subject: = [FlyRotary] Re: HP was : Mark's BBQ Run / 20B numbers

 

Should be a fire belching dragon of = an engine at over 15psi, Greg.

 

 15 Psi boost would be roughly 60” Hg of boost which at an A/F ratio of 12 (assume you would run = it a bit rich at those boost levels) would give at 6000 rpm approx 550 HP = burning 51 gph (more power  at high rpm and boost naturally)  and = producing a total of  25000 BTU/Min of heat to be dumped through the radiator = and oil cooler.  Boy, you will produce more heat energy that gets dumped = through your oil cooler (8484 BTU/Min) than my total (coolant and oil heat) = entire engine puts out.  Hope you have big radiators and oil cooler = {:>).



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The message was checked by ESET NOD32 Antivirus.

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