Received-SPF: none
 receiver=logan.com; client-ip=204.127.200.85; envelope-from=n3773@comcast.net
Message-ID: <002601c74a77$dd368590$1c8d1518@rv8>
Reply-To: "kevin lane" <n3773@comcast.net>
From: "kevin lane" <n3773@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1815284@logan.com>
Subject: Re: [FlyRotary] Finally built - 3.7 lb, 600 cranking amp, 11.5 A-hr battery
Date: Tue, 6 Feb 2007 21:21:38 -0800
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=response
Content-Transfer-Encoding: 7bit

the last time I saw such a weight savings was building my rv-8.  $1100(?) 
got me 13 lbs lighter with an AL landing gear (I forget the exact numbers). 
better yet, this will fit my -6A.
----- Original Message ----- 
From: "Bill Dube" <billdube@killacycle.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, February 06, 2007 8:21 AM
Subject: [FlyRotary] Finally built - 3.7 lb, 600 cranking amp, 11.5 A-hr 
battery


> Well, I said I was going to do it and we finally got the prototype built.
>
> We just built a 600 cranking amp, 11.5 A-hr, battery that weighs just 3.7 
> pounds. I've been testing it in my GMC van for the past week here in the 
> Denver Winter. It snaps the van right over every morning without a 
> problem. The van cranks faster than it did with the standard lead-acid 
> battery.
>
> It is smaller than the Odyssey 680 so it fit in the same battery box with 
> a couple of foam blocks for spacers.
> The battery has four status LEDs that tell you the cell balancing 
> electronics are working OK. We are using A123 Systems M1 cells with our 
> own custom battery management electronics. The A123 Systems cells are 
> proven to be the safest Li-Ion cells on the market. No problems with fires 
> (like laptop cells) because the chemistry they use is completely 
> different.
>
> The battery can be damaged by running it completely flat (like leaving the 
> master on) and holding the battery below 8 volts for a long time. It can 
> also be damaged by charging it over 15.0 volts. It will likely still 
> function after such abuse, but it won't be nearly as good as it was 
> originally. If you don't abuse it, it should last you for many years.
>
> I think we will be in production in about a month, maybe two.
>
> Specs:
>
> 3.7 lbs
> 600 cranking amps
> 11.5 amp-hr
> Approximate maximum dimensions: 3" wide, 5" long, 7" tall (including 
> terminals)
> Charging voltage = 13.8 to 15.0 volts (anywhere in this range is OK)
> Nominal voltage = 13.2 volts (Just a touch higher than your typical 
> lead-acid, so it spins the starter a touch faster.)
> Cell cycle life rated at 2000 cycles (80% DOD, 90% capacity remaining) 
> 10,000 cycles (80% DOD with 50% capacity remaining) @25 C
> Cell specs: 
> <http://www.a123systems.com/html/products/ANR26650M1specs.pdf>http://www.a123systems.com/html/products/ANR26650M1specs.pdf
> Maintenance free
> No heavy metals (iron-phosphate type cells)
>
> At this time, we estimate the retail price will be $595. (Yeah, I know 
> this is not cheap, but this is the state-of-the-art battery technology so 
> the parts to make it are not cheap.)
>
> Here is a picture of the prototype. We have it in a clear Lexan case so we 
> can keep an eye on it. The production battery will have a smaller opaque 
> case with a clear top lid (terminal end.)
> http://www.killacycle.com/photos/aircraft-battery/Prototype1InVan.JPG
>
>
> We have been racing these cells in the KillaCycle for about a year, so we 
> know _all_ about them.
> <http://www.KillaCycle.com>http://www.KillaCycle.com (Be sure to watch the 
> movie clip.)
>
>
> Bill Dube'
> <mailto:bike@KillaCycle.com>bike@KillaCycle.com
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/