Return-Path: Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 521998 for flyrotary@lancaironline.net; Sun, 07 Nov 2004 21:08:54 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=sqpilot@bellsouth.net Received: from Carol ([209.214.45.41]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with SMTP id <20041108020824.YEGL2398.imf18aec.mail.bellsouth.net@Carol> for ; Sun, 7 Nov 2004 21:08:24 -0500 Message-ID: <004601c4c537$abd0d680$292dd6d1@Carol> From: "paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: PM alternator/generator with EWP Date: Sun, 7 Nov 2004 20:06:36 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 ----- Original Message ----- From: "rijakits" To: "Rotary motors in aircraft" Sent: Sunday, November 07, 2004 3:05 PM Subject: [FlyRotary] Re: PM alternator/generator with EWP > Again, my question: > From where do you have the idea, that belts are the major prolblem? > > Thomas J. > > Belts are a major problem.....Since my aircraft is a pusher (canard), the > engine is mounted at the rear of the aircraft, just behind the main spar, > which also carries both aileron push-pull tubes. If a belt breaks there, > it could easily take out my aileron control rods. That is the major > problem I have with belts. Paul Conner, 13b powered SQ2000 canard > ----- Original Message ----- > From: "Ernest Christley" > To: "Rotary motors in aircraft" > Sent: Saturday, November 06, 2004 2:33 PM > Subject: [FlyRotary] PM alternator/generator with EWP > > >> Per the discussion of breaking belts... >> >> Belts are needed for two things, the alternator and the water pump. But >> if we replace the water pump can we get rid of the belt? >> >> Has anyone considered replacing the crank angle sensor with a PM >> alternator/generator? >> >> The things are relative simple (a can of coiled wire with some magnets >> on a spinning shaft in the middle), but what effect would a spinning >> magnet have on the hall effect sensor that drives the ignition system? >> >> I've been looking at this a while. It looks like a hole could be tapped >> and threaded into the top of the crank angle sensor shaft. A generator >> with a threaded shaft would be screwed into that, properly oriented >> threads insuring that the generator shaft will never come unscrewed, and >> some straps on the housing to keep it from spinning. >> >> A 35A generator, is < 500W would only need a few ft.oz. of retaining >> force at 6000RPM. >> >> The front pulley could be replaced with the same sort of installation. >> >> Another consideraton. Alternators have a heavy shell, bearings and >> mounting because there is a substantial side loads and vibrations >> derived from the belt. A gear driven generator can be much lighter, >> with just a sheet metal can for a housing. >> >> I've got a number for an electrical engineer who is going to help me >> work out the feasability and sizing for this application, but I'd like >> the thoughts of anyone on the list. >> >> >> -- >> http://www.ernest.isa-geek.org/ >> "This is by far the hardest lesson about freedom. It goes against >> instinct, and morality, to just sit back and watch people make >> mistakes. We want to help them, which means control them and their >> decisions, but in doing so we actually hurt them (and ourselves)." >> >> >> >> Homepage: http://www.flyrotary.com/ >> >> Archive: http://lancaironline.net/lists/flyrotary/List.html >> > > > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html >