Return-Path: Received: from tomcat.al.noaa.gov ([140.172.240.2] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 756335 for flyrotary@lancaironline.net; Wed, 23 Feb 2005 14:09:22 -0500 Received-SPF: none receiver=logan.com; client-ip=140.172.240.2; envelope-from=bdube@al.noaa.gov Received: from PILEUS.al.noaa.gov (pileus.al.noaa.gov [140.172.241.195]) by tomcat.al.noaa.gov (8.12.0/8.12.0) with ESMTP id j1NJ8ZsX021484 for ; Wed, 23 Feb 2005 12:08:35 -0700 (MST) Message-Id: <5.2.1.1.0.20050223114155.055c8e90@mailsrvr.al.noaa.gov> X-Sender: bdube@mailsrvr.al.noaa.gov X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 23 Feb 2005 12:08:17 -0700 To: "Rotary motors in aircraft" From: Bill Dube Subject: Re: [FlyRotary] Battery and Charging System In-Reply-To: Mime-Version: 1.0 Content-Type: text/html; charset="us-ascii" At 11:49 AM 2/23/2005 -0600, you wrote:

Since we are discussing our electrical system. Has anyone looked at this product?

http://www.optimabatteries.se/

        What would you like to know about Optima batteries?

        The smallest battery that they make(YT S 2.7) weighs 25 pounds. It has 510 CCA and 41 Ah. About 42 W-hr/kg. About 350 W/kg @ 0 C. This is pretty good.

        The Hawker Odyssey 680 weighs 15 lbs, has 220 CCA and 16 Ah. About 27 W-hr/kg. About 250 W/kg @ 0 C.

        The SVR-14 weighs 11.5 lbs, has 200 CCA and 14 Ah. About 32 W-hr/kg. About 306 W/kg @ 0 C.

        If the specs given reflect the actual performance of the battery, the Optima YT S 2.7 looks to be a very well designed battery. A bit heavy for an airplane, however.

Bobby