X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.25.9.101] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2141360 for flyrotary@lancaironline.net; Tue, 26 Jun 2007 12:37:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-02.southeast.rr.com (8.13.6/8.13.6) with SMTP id l5QGaQIn004895 for ; Tue, 26 Jun 2007 12:36:26 -0400 (EDT) Message-ID: <001901c7b815$343b1620$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Battery Date: Tue, 26 Jun 2007 13:12:40 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01C7B7F3.ACCA1810" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0016_01C7B7F3.ACCA1810 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable A bit smaller than most used in the RV series of aircraft. Apparently = if only cranking power is the concern, an amazing amount of energy can = be had in a small package. But, if staying power is required (such as = alternator failure) then most of the smaller batteries I have checked = out don't provide more than 15-20 minutes at a normal all-electric load. I started out with two 22 lb concord batteries that were huge - I then = went to two Odyssey 680 batteries at 14 1/2 lbs each. These were about = 1/2 the volume of the concord. I now fly with one PC 680 battery which = at 14 1/2 lbs seems to provide a good balance between light weight, = cranking power and staying power. =20 So for cranking your battery might do just fine - but, I would look at = the Amp hours you wish to have as a back up emergency reserve and size = your battery according to that. Ed ----- Original Message -----=20 From: bmears9413@aol.com=20 To: Rotary motors in aircraft=20 Sent: Tuesday, June 26, 2007 11:57 AM Subject: [FlyRotary] Battery My battery box in my kit will require a battery about 5 1/2" X 6". = That seems pretty small to me. Is that about average for aircraft = batteries? Bob Mears Supermarine Spitfire -------------------------------------------------------------------------= ----- AOL now offers free email to everyone. Find out more about what's free = from AOL at AOL.com. ------=_NextPart_000_0016_01C7B7F3.ACCA1810 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
A bit smaller than most used in the RV series of = aircraft.  Apparently if only cranking power is the concern, an = amazing=20 amount of energy can be had in a small package.  But, if staying = power is=20 required (such as alternator failure) then most of the smaller batteries = I have=20 checked out don't provide more than 15-20 minutes at a normal = all-electric=20 load.
 
I started out with two 22 lb concord batteries = that were=20 huge - I then went to two Odyssey 680 batteries at 14 1/2 lbs = each.  These=20 were about 1/2 the volume of the concord.  I now fly with one PC = 680=20 battery which at 14 1/2 lbs seems to provide a good balance between = light=20 weight, cranking power and staying power. 
 
So for cranking your battery might do just fine = - but, I=20 would look at the Amp hours you wish to have as a back up emergency = reserve and=20 size your battery according to that.
 
Ed
 
----- Original Message -----
From:=20 bmears9413@aol.com
Sent: Tuesday, June 26, 2007 = 11:57=20 AM
Subject: [FlyRotary] = Battery

My battery box in my kit will require a battery about 5 1/2" X = 6". That=20 seems pretty small to me. Is that about average for aircraft=20 batteries?

Bob Mears
Supermarine Spitfire
AOL now offers free email to everyone. Find out more about what's free = from=20 AOL at AOL.com.
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