X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 937747 for flyrotary@lancaironline.net; Mon, 09 May 2005 15:24:58 -0400 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 <20050509192412.ZKZZ2428.imf17aec.mail.bellsouth.net@rd> for ; Mon, 9 May 2005 15:24:12 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: center rotor OFF Date: Mon, 9 May 2005 14:24:20 -0500 Message-ID: <000001c554cc$b36b6a70$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C554A2.CA956270" 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_01C554A2.CA956270 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I'm thinking this would not be a good plan. For the piston engines you referred to, I bet they have a way to control the valves with solenoids so the deactivated pistons aren't producing compression. Actually they do have compression. No fuel or fire. Bill Jepson OK, make me look it up :-) Apparently, they stop the valves from opening, rather than leaving them open. I couldn't find anything that gave details of exactly what point in the sequence they stop the valves, so the cylinder could either be full of air (silly and wasteful of power), empty of air (would cause vacuum that would be as bad as the compression force), or perhaps somewhere in between. Here's the best article I found, though with annoying ads. Don't forget about those active controlled engine mounts to smooth out the 3 cylinder operation in economy mode. Just boggles the mind what they'll do to make improvements in economy. http://www.canadiandriver.com/articles/jk/041014.htm Cheers, Rusty (Great Plains VW 2180 running, and for sale) ------=_NextPart_000_0001_01C554A2.CA956270 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I'm thinking this = would not be a=20 good plan.  For the piston engines you referred to, I bet they have = a way=20 to control the valves with solenoids so the deactivated pistons aren't = producing=20 compression. 
Actually they do have compression. No fuel or fire.
Bill Jepson 
 
 
OK, = make me look=20 it up :-)  Apparently, they stop the valves from = opening, rather than=20 leaving them open.  I couldn't find anything that gave details of = exactly=20 what point in the sequence they stop the valves, so the cylinder could = either be=20 full of air (silly and wasteful of power), empty of air (would cause = vacuum that=20 would be as bad as the compression force), or perhaps somewhere in=20 between.  
 
Here's the best=20 article I found, though with annoying ads.  Don't forget about = those=20 active controlled engine mounts to smooth out the 3 cylinder = operation in=20 economy mode.  Just boggles the mind what they'll do to make = improvements=20 in economy. 
 
http://www.= canadiandriver.com/articles/jk/041014.htm
 
Cheers,
Rusty (Great=20 Plains VW 2180 running, and for = sale)
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