X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2555556 for flyrotary@lancaironline.net; Tue, 04 Dec 2007 11:15:58 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta04.mail.rr.com with SMTP id <20071204161520.WYUT5837.cdptpa-omta04.mail.rr.com@edward2> for ; Tue, 4 Dec 2007 16:15:20 +0000 Message-ID: <001d01c83690$d3656fd0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] circuit breakers Date: Tue, 4 Dec 2007 11:15:02 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C83666.EA5D5B50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C83666.EA5D5B50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bob, My master switch controls power to everything EXCEPT flight = critical systems. I also had the concern about a switch failing on any = of the flight critical systems. So here is what I did: 1. I purchased the best (sealed) toggle switches I could buy for the = power on - off (these are not the combined Switch/CB that I use for = things like lights, heater, etc - ie. non critical.) They were not = inexpensive - around $25-30 back in the early 1990s. I have five of = these for EC2, 2 Fuel Pumps and 2 injector disable switches. 2. I installed a 20 amp pull-type CB that by-passes all switches for = the critical systems. In other words should the power switch to my EC2 = or fuel pumps suffer a mechanical failure, I can push in this CB and it = routes power directly to the critical systems - you can then turn off = the toggle power switches and everything will continue to run. I call = this my "live man switch" {:>) 3. The injectors and ignition coils are wire directly to the main buss = through a CB (but no switches - well - actually the injectors do have = the disable switches) 4. I have two 40 amp CB between my battery and main buss each on a = separate power cable, the battery has two power cables each with its own = CB. This is what was left over once I went from two batteries to one = battery. So now I have two routes to power through 2 different CBs. I = know a bit anal, but makes me feel better {:>) If I were to do it over, I would make the following changes 1. Have a separate power lead and CB for each ignition coil (I have the = two stock coils) 2. Have a separate power lead and CB for each injector pair(I have two = pairs) Hope this helps Ed ----- Original Message -----=20 From: bmears9413@aol.com=20 To: Rotary motors in aircraft=20 Sent: Tuesday, December 04, 2007 10:50 AM Subject: [FlyRotary] circuit breakers Ed, Do you run a master switch, or are the Circuit breakers the switch. I = have a master switch, but its bothering me that if that ONE switch = fails, it all fails. I I think I'll skip the master switch for flight = critical. Bob Mears Supermarine Spitfire -------------------------------------------------------------------------= ----- More new features than ever. Check out the new AOL Mail! ------=_NextPart_000_001A_01C83666.EA5D5B50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bob, My master switch controls power to=20 everything  EXCEPT  flight critical systems.  I also = had the=20 concern about a switch failing on any of the flight critical = systems. =20 So here is what I did:
 
1.  I purchased the best (sealed) toggle = switches I=20 could buy for the power on - off (these are not the combined Switch/CB = that I=20 use for things like lights, heater, etc - ie. non critical.) They were = not=20 inexpensive - around $25-30 back in the early 1990s.  I have five = of these=20 for EC2, 2 Fuel Pumps and 2 injector disable switches.
2.  I installed a 20 amp pull-type CB that = by-passes=20 all switches for the critical systems. In other words should the power = switch to=20 my EC2 or fuel pumps suffer a mechanical failure, I can push in this CB = and it=20 routes power directly to the critical systems - you can then turn off = the=20 toggle  power switches and everything will continue to run. I call = this my=20 "live man switch" {:>)
3.  The injectors and ignition coils are = wire=20 directly to the main buss through a CB (but no switches - well - = actually the=20 injectors do have the disable switches)
4.  I have two 40 amp CB between my battery = and main=20 buss each on a separate power cable, the battery has two power cables = each with=20 its own CB.  This is what was left over once I went from two = batteries to=20 one battery.  So now I have two routes to power through 2 different = CBs.  I know a bit anal, but makes me feel better = {:>)
 
If I were to do it over, I would make the = following=20 changes
 
1.  Have a separate power lead and CB for = each=20 ignition coil (I have the two stock coils)
2.  Have a separate power lead and CB for = each=20 injector pair(I have two pairs)
 
 
Hope this helps
 
Ed
----- Original Message -----
From:=20 bmears9413@aol.com
Sent: Tuesday, December 04, = 2007 10:50=20 AM
Subject: [FlyRotary] circuit=20 breakers

Ed,

Do you run a master switch, or are the = Circuit=20 breakers the switch. I have a master switch, but its bothering me that = if that=20 ONE switch fails, it all fails. I I think I'll skip the master switch = for=20 flight critical.

Bob Mears
Supermarine Spitfire
More new features than ever. Check out the new AOL Mail!
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