X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-pw0-f48.google.com ([209.85.160.48] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with ESMTP id 3985099 for flyrotary@lancaironline.net; Sat, 21 Nov 2009 20:39:38 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.48; envelope-from=wdleonard@gmail.com Received: by pwj12 with SMTP id 12so3179715pwj.27 for ; Sat, 21 Nov 2009 17:39:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=/eltA/HV+uy15dru1o4g2QuCfWuEgqlSKKo2Q1pFAyc=; b=AxGXQSME+pGgL56t6DOm2rUJBACmJ0vkcTY3fIC8oZvu/8sSDVC9kBXxQqx/8gSs2u OewuZ0QE/PODsxnCRGsszEn9ot3vEsqhrcMVw3YQ3I6gGMafP87PCiV3wKrL+CXqq05N U3IkFZT2yF2hTKHunL3GHkpYiHPRbzES8xUQY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=sLgGx8SOYfodbrWR4JMuXSnrqB/13izl+GoJfaFhG6QvbQEpPl/cloaw9Iq3wHPDVb 7g8PDef+eBSa709fT+W7J1KpjCyRMuvwMEkJE41oF27xFvAMlelWfoGAVDYzCzV3M54C 4eUOnywVFXaTUZJDITUK5ECbPJIpHmq4RT9So= MIME-Version: 1.0 Received: by 10.142.3.13 with SMTP id 13mr354144wfc.302.1258853941349; Sat, 21 Nov 2009 17:39:01 -0800 (PST) In-Reply-To: References: Date: Sat, 21 Nov 2009 17:39:01 -0800 Message-ID: <1c23473f0911211739t629f8729yddf36e62a591d37a@mail.gmail.com> Subject: Re: [FlyRotary] Re: No start From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016368e26deff8f3b0478ebc568 --0016368e26deff8f3b0478ebc568 Content-Type: text/plain; charset=ISO-8859-1 I think Steve is onto something here. If you run the starter off the other battery, it is likely to solve the problem reguardless of cause just like your test run with an external battery. With reguard to the actual cause, I tend to side with Tracy in that is more likely to be CAS interference rather than low voltage. I have left my master on for several hours. Enough that when the started turned (and it barely turned) the voltage dropped low enough to really dim the cocktpit lights and shut down the music radio, but the EC2 had enough juice to get the engine going. Good luck! -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net On Sat, Nov 21, 2009 at 10:40 AM, Steven W. Boese wrote: > Steve, > > I was able to produce symptoms similar to what you describe by inserting a > 1.5 V flashlight battery into the CAS return wire such that the CAS end of > the wire was 1.5 V more negative than the CAS return wire going to the EC2: > CAS ----- battery ++++ EC2 > > The opposite polarity didn't cause problems. With the battery installed, > there are one or two sparks when starting to turn the CAS and then no more > sparks until the CAS sensor is turning significantly faster than would be > the case when turning the engine with the starter. > > It seems that you may have the CAS return grounded in addition to the > connection to the EC2. If this is the case, then the voltage drop from the > starter current may shift the CAS return voltage similar to what I did with > the test setup. If I disconnect the CAS from the EC2 at the EC2 connector, > all the CAS wires show infinite resistance to ground. It might be useful to > see if your wiring is similar. > > Steve Boese > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --0016368e26deff8f3b0478ebc568 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
I think Steve is onto something here.=A0 If you run the starter off th= e other battery, it is likely to solve the problem reguardless of cause jus= t like your test run with an external battery.
=A0
With reguard to the actual cause, I tend to side with Tracy in that is= more likely to be CAS interference rather than low voltage.=A0 I have left= my master on for several hours.=A0 Enough that when the started turned (an= d it barely turned) the voltage dropped low enough to really dim the cocktp= it lights and shut down the music radio, but the EC2 had enough juice to ge= t the engine going.
=A0
Good luck!

--
David Leonard

Turbo Rotary RV-6 N4VYhttp://N4VY.RotaryRoster.net=
http://RotaryRoster.net
=A0
On Sat, Nov 21, 2009 at 10:40 AM, Steven W. Boes= e <SBoese@uwyo.edu<= /a>> wrote:
Steve,

I was able to prod= uce symptoms similar to what you describe by inserting a 1.5 V flashlight b= attery into the CAS return wire such that the CAS end of the wire was 1.5 V= more negative than the CAS return wire going to the EC2:
CAS ----- battery ++++ EC2

The opposite polarity didn't cause pr= oblems. =A0With the battery installed, there are one or two sparks when sta= rting to turn the CAS and then no more sparks until the CAS sensor is turni= ng significantly faster than would be the case when turning the engine with= the starter.

It seems that you may have the CAS return grounded in addition to the c= onnection to the EC2. =A0If this is the case, then the voltage drop from th= e starter current may shift the CAS return voltage similar to what I did wi= th the test setup. =A0If I disconnect the CAS from the EC2 at the EC2 conne= ctor, all the CAS wires show infinite resistance to ground. =A0It might be = useful to see if your wiring is similar.

Steve Boese



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