Return-Path: Received: from [12.10.147.52] (HELO utmcmail.utmc.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 757836 for flyrotary@lancaironline.net; Thu, 24 Feb 2005 14:28:49 -0500 Received-SPF: none receiver=logan.com; client-ip=12.10.147.52; envelope-from=Grant.Schemmel@Aeroflex.com Received: from mcwolf.utmc.utc.com ([10.1.1.1]) by utmcmail.utmc.com with Microsoft SMTPSVC(5.0.2195.6713); Thu, 24 Feb 2005 12:27:55 -0700 Received: from pony.utmc.utc.com(172.24.100.19) by mcwolf.utmc.utc.com via csmap id f2d77684_8697_11d9_9ab8_00304811acd7_9006; Thu, 24 Feb 2005 12:11:55 -0700 (MST) Received: by pony.utmc.utc.com with Internet Mail Service (5.5.2655.55) id ; Thu, 24 Feb 2005 12:27:51 -0700 Message-ID: From: "Schemmel, Grant" To: 'Rotary motors in aircraft' Subject: RE: [FlyRotary] Re: E-shaft permanent magnet alternator Date: Thu, 24 Feb 2005 12:27:51 -0700 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2655.55) Content-Type: text/plain; charset="ISO-8859-1" Return-Path: Grant.Schemmel@Aeroflex.com X-OriginalArrivalTime: 24 Feb 2005 19:27:55.0817 (UTC) FILETIME=[F0E21990:01C51AA6] I too like the idea of no pulleys on the engine. If this works out, I would be inclined to put the alternator(s) on the PSRU end, and do a direct drive water pump off the e-shaft end. IMHO, I would think just running an EWP would be a risk. Grant Schemmel -----Original Message----- From: Ernest Christley [mailto:echristl@cisco.com] Sent: Thursday, February 24, 2005 10:11 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: E-shaft permanent magnet alternator Jim Sower wrote: > I don't see the point of two primaries (unless you're using 1920s era > technology like mags). My notion is to have a good, solid ND primary > and either a [small] backup battery or [small] backup Alt. If I have > redundant primaries, I'm probably too heavy, and (just me) more > tempted to drive around with one failed while I wait on parts or > something. Jim, my goal is to eliminate the belt driven alternator entirely. No belt. No pulley. No heavy alternator hanging off the side of the engine on a heavy cantilevered bracket. No need for a cowl bump to give it clearance. I'm looking for at least a 35A primary and 20A secondary. I'm actually quite comfortable with the idea of flying with only a primary, but if you look at these things they are like an alternator with all of the heavy parts thrown out. The backup is cheap, weight wise. My guess is that the difference between the 20A and 35A unit is the wire guage used in the coils, and you'd need an ounce scale to tell the difference. >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html