X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [68.202.132.19] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WEBUSER 5.1.2) with HTTP id 1599049 for flyrotary@lancaironline.net; Fri, 24 Nov 2006 09:22:56 -0500 From: "Marvin Kaye" Subject: Re: [FlyRotary] Z-19 questions To: "Rotary motors in aircraft" X-Mailer: CommuniGate Pro WebUser v5.1.2 Date: Fri, 24 Nov 2006 09:22:56 -0500 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain;charset="iso-8859-1";format="flowed" Content-Transfer-Encoding: 8bit Hi Bill, I'm assuming you are trying to deal with single-point failure modes... Considering each circuit you named, you've already got your redundancy with the coils, just wire each coil to its own breaker. Loss of a single coil should still allow the engine to keep running, albeit at a slightly reduced power level. As for the pumps, most of them allow flow through, so put a pair of them in-line and power each separately. This keeps you from having to over-complicate the fuel path with check valves and selectors, while giving you the electrical redundancy you seek. As for the injectors, unless you install a second set on your intake and make them switchable for their driver input, you're probably stuck with a single point issue there. Bill Bradburry wrote: OK, This is my fall back position. I have posed this question on the Aerolectric list for a couple of days and no answer. (although the email did get caught up in an embarrasing event!) 90% of you guys have already wired your planes and followed Bob N's advice, so how did you do the redundancy on the fuel pumps, coils, and injectors? from the AE list: "I am installing a fuel injected Mazda rotary engine and trying to follow the Z-19 guidelines for dual battery, single alternator. Looking at the engine primary and secondary circuit, I need to install a primary and secondary fuel pump, plus I want to power the coils and the injectors off of the battery buss. How should I do this? I suppose I could take the fuel pump diode output and switch it to either of the two fuel pumps??? What about the coils and injectors? Should I set up similar circuits for them, or is there a better way to reduce parts??? I would appreciate any guidance you guys could give me. Thanks and Happy Thanksgiving! Bill B -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/