Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 742669 for flyrotary@lancaironline.net; Thu, 17 Feb 2005 08:35:08 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=sqpilot@bellsouth.net Received: from [209.214.45.56] by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050217133419.JWSO2048.imf19aec.mail.bellsouth.net@[209.214.45.56]> for ; Thu, 17 Feb 2005 08:34:19 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.8.8]); Thu, 17 Feb 2005 07:33:23 -0600 Message-ID: <00e701c514f5$338d52d0$382dd6d1@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Battery voltage (was: Racetech RV6A Forced Landing) Date: Thu, 17 Feb 2005 07:27:01 -0600 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-42149D232443=======" --=======AVGMAIL-42149D232443======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C5_01C514C2.126FE0A0" ------=_NextPart_000_00C5_01C514C2.126FE0A0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I agree, Tracy....I have a bright red LED failure light right in the = center of the panel, and my voice annunciating engine monitor voice = keeps announcing "warning...low voltae" every 6 seconds, while = displaying the words "low voltage" on the face of the engine monitor, = and it flashes constantly until you press a button to shut her up. Paul = Conner ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Wednesday, February 16, 2005 11:58 AM Subject: [FlyRotary] Re: Battery voltage (was: Racetech RV6A Forced = Landing) My voltage alarm is set to go off at around 13.5 volts. This is = higher than a fully charged battery. In other words, alarm goes off the = instant that the alternator fails. System voltage is about 14.2 volts = under normal conditions. It is amazing that people with a complete understanding of how = critical electrical system is on an EFI aircraft engine would install an = alarm light so small or positioned in such a way that it would not be = noticed. I would have to be brain dead not to notice mine. I have had = one alternator failure which occurred almost immediately after engine = start (this seems to be common). The alarm went off and I taxied back = to the hangar. My reaction was not to install another 30 to 40 pounds = of electrical stuff on the aircraft. Tracy George, Most of the motorcycles will still show at least 11 volts while = cranking and those are small batteries. They will jump back up to at = least 12.5 after cranking. I agree that 9.5 volts is almost totally dead = for practical purposes. Most battery based systems will have trouble at = around 10 volts. Use a backup battery and a changeover system with any = electrically based system. The EXP Buss (I think) is sold by the = anywhere map people. Makes it very easy to set up a battery backup = system and still charge both. I think Eggenfellner also sells them. Good = looking product, a good friend has one.=20 For battery info go to the Yuasa web site. In the technical section = they have a excellent do's and don'ts of battery operation. There is = also a good description of the different battery types and their = discharge rates. Good info to know about this VITAL system part! Bill Jepson=20 In a message dated 2/15/2005 11:34:28 PM Pacific Standard Time, = lendich@optusnet.com.au writes: Bill, What would you expect the battery to show under starting load. George ( down under) > > > I suspected a charging system failure immediately and checked = the > >battery voltage in the SDS monitor. This read 9.5 volts so I = knew then that > >we had a charging system failure. At the time, I was not = worried about > >making it to an airport, assuming that the alternator had = failed just in the > >last few minutes and believing that I had 20-25 minutes of = battery power > >remaining. In fact, it is likely that the alternator failed = soon after > >takeoff from Springbank but I did not notice signs of the = failure until the > >battery was well over half dead. -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005 ------=_NextPart_000_00C5_01C514C2.126FE0A0 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
I agree, Tracy....I have a bright red LED = failure light=20 right in the center of the panel, and my voice annunciating engine = monitor voice=20 keeps announcing "warning...low voltae" every 6 seconds, while = displaying the=20 words "low voltage" on the face of the engine monitor, and it flashes = constantly=20 until you press a button to shut her up.  Paul Conner
----- Original Message -----
From:=20 Tracy = Crook
Sent: Wednesday, February 16, = 2005 11:58=20 AM
Subject: [FlyRotary] Re: = Battery voltage=20 (was: Racetech RV6A Forced Landing)

My voltage alarm is set to go off at around 13.5 = volts.  This=20 is higher than a fully charged battery.  In other = words, alarm goes=20 off the instant that the alternator fails.  System voltage is = about 14.2=20 volts under normal conditions.
 
It is amazing that people with a complete understanding of = how=20 critical electrical system is on an EFI aircraft engine would install = an alarm=20 light so small or positioned in such a way that it would not be = noticed. =20 I would have to be brain dead not to notice mine.  I have had one = alternator failure which occurred almost immediately after engine = start (this=20 seems to be common).  The alarm went off and I taxied back to the = hangar.  My reaction was not to install another 30 to 40 pounds = of=20 electrical stuff on the aircraft.
 
Tracy
George,
 Most of the motorcycles will still show at least 11 volts = while=20 cranking and those are small batteries. They will jump back up to at = least=20 12.5 after cranking. I agree that 9.5 volts is almost totally dead = for=20 practical purposes. Most battery based systems will have trouble at = around=20 10 volts. Use a backup battery and a changeover system with any = electrically=20 based system. The EXP Buss (I think) is sold by the anywhere map = people.=20 Makes it very easy to set up a battery backup system and still = charge both.=20 I think Eggenfellner also sells them. Good looking product, a good = friend=20 has one.
 For battery info go to the Yuasa web site. In the = technical=20 section they have a excellent do's and don'ts of battery operation. = There is=20 also a good description of the different battery types and their = discharge=20 rates. Good info to know about this VITAL system part!
Bill Jepson 
 
In a message dated 2/15/2005 11:34:28 PM Pacific Standard Time, = lendich@optusnet.com.au writes:
Bill,
What would you expect the battery to show under = starting=20 load.
George ( down under)

>
> >  I = suspected a=20 charging system failure immediately and checked the
> = >battery=20 voltage in the SDS monitor. This read 9.5 volts so I knew=20 then
that
> >we had a charging system failure. At the = time, I=20 was not worried about
> >making it to an airport, = assuming that=20 the alternator had failed just in
the
> >last few = minutes and=20 believing that I had 20-25 minutes of battery power
> = >remaining.=20 In fact, it is likely that the alternator failed soon = after
>=20 >takeoff from Springbank but I did not notice signs of the = failure=20 until
the
> >battery was well over half=20 dead.
 

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.8 - Release = Date:=20 2/14/2005
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