X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f204.google.com ([209.85.221.204] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3682752 for flyrotary@lancaironline.net; Mon, 15 Jun 2009 08:28:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.204; envelope-from=wdleonard@gmail.com Received: by qyk42 with SMTP id 42so4595387qyk.7 for ; Mon, 15 Jun 2009 05:27:43 -0700 (PDT) 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=DjiWBVYUxTnuVR6nvMcP9h3aeayBycLV6ziBvKHwXeY=; b=J+nZrqMS0i17bGaaBDXwQ0fX0PW8nZbPQZx9Li3FdiulHRNv/mvkJd0quk4u4bTZ2/ JUfUSicIz3BlWJ+yP8gDdjJE0aGf5ZIsoSEISx3QZ3yWFPXBuEoBlbBSzwwVuOcXQw4m yamePzWpa2GoGr7jKyB+7unJ4aBQeHvnedAdQ= 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=LHFblgNq0pljTFLQQ6MhsyR/4UDHzz+na1Q0DoYUJK1EtIqdqhHuBvoo6S1D1YCLjn t/eQGxsfAQ111mvUgoN7gD8SPYSaBRg1VIrMJaBcjJgCNAYz2Ph3hu9Fbf9C63U3Gr+W 4PPmvm4HmWTZOxfCpH2UF51+bZAKE78rMc4Lw= MIME-Version: 1.0 Received: by 10.220.85.67 with SMTP id n3mr4435109vcl.53.1245068863579; Mon, 15 Jun 2009 05:27:43 -0700 (PDT) In-Reply-To: References: Date: Mon, 15 Jun 2009 05:27:43 -0700 Message-ID: <1c23473f0906150527m1c38b938t120a2e416c80b792@mail.gmail.com> Subject: Re: [FlyRotary] Re: Over Voltage? From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e646071055a6c6046c622fbb --0016e646071055a6c6046c622fbb Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Thanks Todd, I guess I really shoud get around to doing that. Seems to me that I remember the all the parts for a crow-bar system being about $300. Is that not the case? I have already modified my alternator so that if I shut off the b-field I can shut down the alternator - do I need to make further internal modifications to the alternaror to use an external regulator? Dave On Sun, Jun 14, 2009 at 11:36 PM, Todd Bartrim wrote: > Hey Dave; > I had a stock alternator internal regulator fail high and as best I can > remember it was always charging ~14.x volts previous to failure. I was lucky > in that I was just taxing up to the hanger when I saw it at ~19volts and > climbing so I quickly shut down. > When designing my system I'd read all of Electric Bob's warning about > internal regulation, but I just figured that I'd never had a problem in all > my years of driving so what were the odds? Not much, yeah right. When I went > to buy a replacement, I found it was going to cost ~$40 and it wasn't in > stock and would have to be ordered, but for $8 I could buy the Ford external > regulator that Bob recommends and they had at least a dozen in stock. So I > built the crow-bar circuit that Bob recommends and I converted my alternator > to an external regulation (pretty easy to do) > Glad I did it, even though I'm not exactly putting up the hours now. > Maybe you don't have a regulation issue, but if you do , you might want > to consider converting. > > Todd (almost finished Harley generator install, pics coming soon) > > > On Sun, 2009-06-14 at 16:21 -0700, David Leonard wrote: > > Today retuning from my flight my voltmeter started to complain "check > voltage". The bus voltage was reading between 14.2 - 14.6 volts. Right > after shut down the battery voltage was reading 13.3 volts. > > > > Is this a sign of impending over voltage failure of the regulator? > > I am using the stock 70 amp alternator. Do I need to replace it right > away? Use an external regulator? Is it safe to watch it for another flight > or two and see what it does? Is it possible that oil mist could have gummed > things up a little and spraying some contact cleaner into the alternator > might do the trick? > > > > How much voltage is too much before I need to land right away? > > Thanks all. > > > > -- > David Leonard > > Turbo Rotary RV-6 N4VY > http://N4VY.RotaryRoster.net > http://RotaryRoster.net > > -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net --0016e646071055a6c6046c622fbb Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Thanks Todd,
=A0
I guess I really shoud get around to doing that.=A0 Seems to me that I= remember the all the parts for a crow-bar system being about $300.=A0=A0 I= s that not the case?=A0 I have already modified my alternator so that if I = shut off the b-field I can shut down the alternator - do I need to make fur= ther internal modifications to the alternaror to use an external regulator?=
=A0
Dave

On Sun, Jun 14, 2009 at 11:36 PM, Todd Bartrim <= span dir=3D"ltr"><bartrim@gmail.com= > wrote:
Hey Dave;
=A0=A0=A0 I had a stock alternator internal regulator fai= l high and as best I can remember it was always charging ~14.x volts previo= us to failure. I was lucky in that I was just taxing up to the hanger=A0 wh= en I saw it at ~19volts and climbing so I quickly shut down.
=A0=A0=A0 When designing my system I'd read all of Electric Bob's w= arning about internal regulation, but I just figured that I'd never had= a problem in all my years of driving so what were the odds? Not much, yeah= right. When I went to buy a replacement, I found it was going to cost ~$40= and it wasn't in stock and would have to be ordered, but for $8 I coul= d buy the Ford external regulator that Bob recommends and they had at least= a dozen in stock. So I built the crow-bar circuit that Bob recommends and = I converted my alternator to an external regulation (pretty easy to do)
Glad I did it, even though I'm not exactly putting up the hours now.=A0=A0=A0 Maybe you don't have a regulation issue, but if you do , you= might want to consider converting.

Todd=A0=A0=A0 (almost finished H= arley generator install, pics coming soon)


On Sun, 2009-06-14 at 16:21 -0700, Da= vid Leonard wrote:=20
Today retuning from my flight my voltmeter starte= d to complain "check voltage".=A0 The bus voltage was reading bet= ween 14.2 - 14.6 volts.=A0 Right after shut down the battery voltage was re= ading 13.3 volts.
=A0
Is this a sign of impending over voltage failure = of the regulator?=A0
I am using the stock 70 amp alternator.=A0 Do I n= eed to replace it right away?=A0 Use an external regulator?=A0 Is it safe t= o watch it for another flight or two and see what it does?=A0 Is it possibl= e that oil mist could have gummed things up a little and spraying some cont= act cleaner into the alternator might do the trick?
=A0
How much voltage is too much before I need to lan= d right away?
Thanks all.


--
David Leonard

Turbo Rotary RV-6= N4VY
http:/= /N4VY.RotaryRoster.net
http://RotaryRoster.net



--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
--0016e646071055a6c6046c622fbb--