Return-Path: Received: from imo-m28.mx.aol.com ([64.12.137.9] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 741125 for flyrotary@lancaironline.net; Wed, 16 Feb 2005 02:54:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.9; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m28.mx.aol.com (mail_out_v37_r3.8.) id q.8d.20d96c98 (4584) for ; Wed, 16 Feb 2005 02:53:44 -0500 (EST) From: WRJJRS@aol.com Message-ID: <8d.20d96c98.2f445607@aol.com> Date: Wed, 16 Feb 2005 02:53:43 EST Subject: Re: [FlyRotary] Re: Battery voltage (was: Racetech RV6A Forced Landing) To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1108540423" X-Mailer: 9.0 SE for Windows sub 5005 -------------------------------1108540423 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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. 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 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. -------------------------------1108540423 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
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 1= 2.5=20 after cranking. I agree that 9.5 volts is almost totally dead for practical=20 purposes. Most battery based systems will have trouble at around 10 volts. U= se a=20 backup battery and a changeover system with any electrically based system. T= he=20 EXP Buss (I think) is sold by the anywhere map people. Makes it very easy to= set=20 up a battery backup system and still charge both. I think Eggenfellner also=20 sells them. Good looking product, a good friend 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,=20 lendich@optusnet.com.au writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>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 then
that
= >=20 >we had a charging system failure. At the time, I was not worried=20 about
> >making it to an airport, assuming that the alternator ha= d=20 failed just in
the
> >last few minutes and believing that I ha= d=20 20-25 minutes of battery power
> >remaining. In fact, it is likel= y=20 that the alternator failed soon after
> >takeoff from Springbank=20= but=20 I did not notice signs of the failure until
the
> >battery was= =20 well over half dead.
 
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