Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Wed, 05 Mar 2003 10:59:33 -0500 Message-ID: X-Original-Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.93.67.83] verified) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2044204 for flyrotary@lancaironline.net; Wed, 05 Mar 2003 08:49:07 -0500 Received: from mail4.carolina.rr.com (fe4 [24.93.67.51]) by ms-smtp-02.southeast.rr.com (8.12.5/8.12.2) with ESMTP id h25DlabB026523 for ; Wed, 5 Mar 2003 08:47:36 -0500 (EST) Received: from o7y6b5 ([24.25.85.21]) by mail4.carolina.rr.com with Microsoft SMTPSVC(5.5.1877.757.75); Wed, 5 Mar 2003 08:50:31 -0500 X-Original-Message-ID: <007501c2e31e$eea044c0$1702a8c0@WorkGroup> From: "Ed Anderson" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Starter solenoid X-Original-Date: Wed, 5 Mar 2003 08:52:26 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0065_01C2E2F4.8BAD8E60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0065_01C2E2F4.8BAD8E60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al, I don't know the current draw of the starter selenoid. The reason for = the starter contactor is that most starter switches could not carry the = starter current drain during starting. So a low amp switch is connect = to the contactor which carries the heavy current draw for the starter. = I think in aircraft use it is primarily for safety reason. If the = solenoid should fail closed then the starter would remain engaged with = the engine running and cause damage. With a switch activate contactor = you remove all power to the starter thereby precluding that type of = mishap. Ed Anderson ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Wednesday, March 05, 2003 8:07 AM Subject: [FlyRotary] Starter solenoid What's the steady-state current draw of the starter solenoid? =20 Why, in all of Bob Nuckol's wiring diagrams, is there a starter = contactor switching the heavy current to the starter? There is already = a contactor in the solenoid. What am I missing here? Al Gietzen ------=_NextPart_000_0065_01C2E2F4.8BAD8E60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Al,
 
 I don't know the current draw of = the starter=20 selenoid.  The reason for the starter contactor is that most = starter=20 switches could not carry the starter current drain during = starting.  So a=20 low amp switch is connect to the contactor which carries the heavy = current draw=20 for the starter.  I think in aircraft use it is primarily for = safety=20 reason.  If the solenoid should fail closed then the starter would = remain=20 engaged with the engine running and cause damage.  With a switch = activate=20 contactor you remove all power to the starter thereby precluding that = type of=20 mishap.
 
Ed Anderson
----- Original Message -----
From:=20 Al=20 Gietzen
Sent: Wednesday, March 05, 2003 = 8:07=20 AM
Subject: [FlyRotary] Starter=20 solenoid

 

What=92s = the=20 steady-state current draw of the starter solenoid?  =

 

Why, in = all of Bob=20 Nuckol=92s wiring diagrams, is there a starter contactor switching the = heavy=20 current to the starter?  There is already a contactor in the=20 solenoid.  What am I missing here?

 

Al=20 Gietzen

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