Return-Path: Received: from fed1rmmtao08.cox.net ([68.230.241.31] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 811146 for flyrotary@lancaironline.net; Sat, 19 Mar 2005 02:23:46 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.31; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao08.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050319072251.KMGQ18934.fed1rmmtao08.cox.net@BigAl> for ; Sat, 19 Mar 2005 02:22:51 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: BMW and EWP Date: Fri, 18 Mar 2005 23:22:55 -0800 Message-ID: <000001c52c54$789590b0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C52C11.6A7250B0" 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_01C52C11.6A7250B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Just to keep you thinking; someone made the comment that the BMW would = have to be capable of pulling up the mountain at 60 mph with its 4 passengers = - or whatever. Doing that with you 3000 lb car up a 15% grade would = require about 21 more hp than driving on the level; which might take about 60, = so 80 - 90 hp? Design the cooling jacket for a low flow EWP and this is easy. =20 One of the most significant "torture tests" they do on the engines is = WOT simulated acceleration through 3 gear changes up to equivalent of 70 = mph; then decelerate back to zero and do it over again. They do this for thousands of cycles. It's a tough test but again; average power is low; = I don't know what, but less then half rated power. =20 =20 Let's say the rated hp is at 4800 rpm. The only time you approach rated power with this car is WOT at 4800 rpm at sealevel on a 60F day. How = long would you ever sustain that condition? =20 Al ------=_NextPart_000_0001_01C52C11.6A7250B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Just to keep you thinking; someone made the comment that the BMW would have = to be capable of pulling up the mountain at 60 mph with its 4 passengers = – or whatever.  Doing that with you 3000 lb car up a 15% grade would require about 21 = more hp than driving on the level; which might take about 60, so 80 – 90 = hp?  Design the cooling jacket for a low flow EWP and this is easy.

 

One of the most significant = “torture tests” they do on the engines is WOT simulated acceleration = through 3 gear changes up to equivalent of 70 mph; then decelerate back to zero = and do it over again.  They do this for thousands of cycles.  It’s = a tough test but again; average power is low; I don’t know what, but = less then half rated power. 

 

Let’s say the rated hp is = at 4800 rpm. The only time you approach rated power with this car is WOT at 4800 = rpm at sealevel on a 60F day.  How long would you ever sustain that = condition?

 

Al

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