Message

X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 944743 for flyrotary@lancaironline.net; Sun, 15 May 2005 10:54:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.72; envelope-from=13brv3@bellsouth.net Received: from ibm70aec.bellsouth.net ([65.6.194.9]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050515145336.DMCQ2028.imf24aec.mail.bellsouth.net@ibm70aec.bellsouth.net> for ; Sun, 15 May 2005 10:53:36 -0400 Received: from rd ([65.6.194.9]) by ibm70aec.bellsouth.net (InterMail vG.1.02.00.01 201-2136-104-101-20040929) with ESMTP id <20050515145336.GSAC19337.ibm70aec.bellsouth.net@rd> for ; Sun, 15 May 2005 10:53:36 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: How long can you fly on your battery?? Date: Sun, 15 May 2005 09:53:36 -0500 Message-ID: <000001c5595d$df78be70$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C55933.F6A2B670" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C55933.F6A2B670 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I was trying to find some info on the Odyssey batteries, and could only = find data for the PC680. http://www.odysseybatteries.com/aircraft.htm Fortunately, for me, that's what I have :-) =20 In the battery world, CX rating seems to mean Capacity when discharged = fully (10.5 V) in X hours. I found some comments that said excess heat and resistance reduces the efficiency as the current rises, which explains = why the amp hour rating his higher for a lower current draw. The only specs given for the PC680 are: C1=3D 12.3 Ah (12.3 amps for one hour) C10=3D 16.0 Ah (1.6 amps for 10 hours) =20 They also list "reserve capacity", which is a standardized rating for = the amount of time it takes to fully discharge a battery when drawing a 25 = amps. For the PC680, reserve capacity is 25 minutes. This spec is given for = all the Odyssey batteries, and in fact, the PC625 is slightly higher at 27 minutes. =20 =20 Based on these figures, I should have 45 minutes of capacity easily, and will plan to be on the ground somewhere in 20 minutes or less. =20 Cheers, Rusty=20 =20 =20 =20 =20 ------=_NextPart_000_0001_01C55933.F6A2B670 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I was trying=20 to find some info on the Odyssey batteries, and could only find data for = the=20 PC680. http://www.odysseyb= atteries.com/aircraft.htm =20 Fortunately, for me, that's what I have = :-)

In the=20 battery world, CX rating seems to mean Capacity when = discharged fully=20 (10.5 V) in X hours. I found some comments that said = excess=20 heat and resistance reduces the efficiency as the current rises, which = explains=20 why the amp hour rating his higher for a lower current draw. The = only=20 specs given for the PC680 are:

C1=3D 12.3=20 Ah (12.3 amps for one hour)

C10=3D 16.0=20 Ah (1.6 amps for = 10=20 hours)

They also=20 list "reserve capacity", which is a standardized rating for the amount = of time=20 it takes to fully discharge a battery when drawing a 25 amps. = For the=20 PC680, reserve capacity is 25 minutes. This spec is given for all = the=20 Odyssey batteries, and in fact, the PC625 is slightly higher at 27=20 minutes.

Based on=20 these figures, I should have 45 minutes of capacity easily, and will = plan to be=20 on the ground somewhere in 20 minutes or less.

Cheers,

Rusty=20

------=_NextPart_000_0001_01C55933.F6A2B670--