Return-Path: Received: from [128.83.126.134] (HELO mail.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.1b8) with ESMTP-TLS id 2433001 for flyrotary@lancaironline.net; Tue, 17 Jun 2003 15:24:01 -0400 Received: (qmail 50337 invoked from network); 17 Jun 2003 19:23:59 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO benefits3.mail.utexas.edu) (146.6.191.101) by wb1.mail.utexas.edu with SMTP; 17 Jun 2003 19:23:59 -0000 Message-Id: <5.1.1.5.2.20030617141959.0430ceb0@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 Date: Tue, 17 Jun 2003 14:23:54 -0500 To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Re: Starter Problem In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 02:06 PM 6/17/2003 -0400, you wrote: >----- Original Message ----- >From: "Tommy James" >To: "Rotary motors in aircraft" >Sent: Monday, June 16, 2003 7:39 PM >Subject: [FlyRotary] Re: Starter Problem > > > > Tracy, > > Following Bob Nuckoll's advice on aircraft wiring is the main reason I >have > > a separate starter contactor, as Bob Rogers points out. > > > > "You might want to look at this article on the subject by Bob Nuckolls of > > the > > Aeroelectric Connection. http://www.aeroelectric.com/articles/strtctr.pdf > > According to him, the initial current rush of the starter is really hard >on > > it" > > > > TJ > >The term "contactor" usually refers to the relay that carries the main >current supply to the starter. This is already built in to the starter >(solonoid). True, the contactor or solenoid takes a good bit of current to >actuate but a separate relay to handle this seems like unnecessary >complication when a *PROPER* switch will do the job. Just haven't heard a >compelling reason why this relay is necessary. > >Tracy > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html The referenced article states that current through the starter switch will be somewhere between 25-35 amps. Most switches I've seen are rated at 10-15 amps. Pegasus Auto Racing, Inc. has a 40 amp push-button starter switch (p/n 4546) for $8.99, if that's what you prefer. http://www.pegasusautoracing.com/pdfs/047.pdf Mark S.