X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1154421 for flyrotary@lancaironline.net; Wed, 14 Jun 2006 15:11:14 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.32; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao07.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060614191026.DCPQ11027.fed1rmmtao07.cox.net@BigAl> for ; Wed, 14 Jun 2006 15:10:26 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: compression ratios Date: Wed, 14 Jun 2006 12:10:29 -0700 Message-ID: <000e01c68fe6$33a8d330$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01C68FAB.8749FB30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_000F_01C68FAB.8749FB30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Based on your information, perhaps the lower compression rotors wouldn't make as much difference as I thought it would, unless the impact on a rotary is different than that of a piston engine. It is a bit different; although based on Mazda data, above about 6000 rpm you won't know the difference between 9.0 and 9.7 ratios. At 5200 I estimated the difference at about 4%. Al ------=_NextPart_000_000F_01C68FAB.8749FB30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Based on your information, perhaps the lower compression rotors wouldn't make =

as much difference as I thought it would, unless the impact on a rotary is =

different than that of a piston engine.

 

It is a bit = different; although based on Mazda data, above about 6000 rpm you won’t know = the difference between 9.0 and 9.7 ratios.  At 5200 I estimated the difference at = about 4%.

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Al

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