Re: (ET) cordless electric mower

[David C Robie <mycroftxx1 juno com>]

YAH I remeber that.  Matter of fact, he was in Current EVents several
times - could look it up.   As I remember he did quite a bit with oddball
battery setups.

In the Feb 05 issue of Car and Driver, there's a photo of a Jr rail type
dragster that's run solely on wind and Photovoltaic power.  Using, I
believe lead acid, he knocked the sox off the others in th class, set
such a record with the Juniors that a new NHRA class had to be created, 
Jr electric drags.  He (Brent Singleton from Utah) is the only one in
that class.

Dave
Weymouth MA


On Wed, 26 Jul 2006 18:33:44 +0000 bill-wallace att net writes:
> Does anyone else recall White Lightning?  An electric land speed 
> record setter in 1999.
> 
> From their website [ http://www.speedace.info/white_lightning.htm ]:
> 
> "White Lightning is powered by two electric motors with controllers 
> and a complex 420 volt battery pack consisting of 6,120 nickel-metal 
> hydride, AA sized batteries."
> 
> If memory serves, a more detailed page I can locate off-hand 
> explained the choice was based on amps / lb..
> 
> Thanks,
> Bill
> 
>  -------------- Original message ----------------------
> From: "David Roden" <etpost drmm net>
> > On 24 Jul 2006 at 21:33, David C Robie wrote:
> > 
> > > NIMHs   -  don't believe the hype.
> > 
> > Like anything else it depends on what you're doing with them.  
> Nicads can 
> > take overcharge much better and I'd guess that's why the tool mfgs 
> went back 
> > to them.  
> > 
> > Users want fast charges but low tool prices.  The mfgs bundle 
> about the 
> > cheapest, crappiest junk chargers they can buy at low bid.  With 
> relatively 
> > high charge rates (in some cases) and essentially no charge 
> control they 
> > trash NiMH in short order, but nicads can stand this treatment 
> better.
> > 
> > Self discharge is higher on NiMH but not that much higher!  Cheap 
> cells or 
> > failing cells *will* have bad SD though.  I use 
> Nexcell/Powerex/Maha and 
> > sometimes Energizer NiMH for my digital cameras.  One of the 
> cameras sits in 
> > my briefcase for weeks or months without being used, and only once 
> has it 
> > let me down when I wanted it.  As I said, good cells are higher SD 
> than 
> > nicad but not by *that* much.
> > 
> > NiMH is quite decent - better than nicad but not as good as 
> lithium based 
> > secondary cells - where you need small size, low weight, lots of 
> energy on 
> > board.  Darn few AA size nicad cells will yield a real world 2.2 
> ah, but 
> > NiMH can and does.  (Though high capacity comes at the expense of 
> cycle 
> > life.)
> > 
> > I don't know how useful this exchange is to trakers since I doubt 
> that 
> > anybody here is going to use NiMH in his tractor - but we do have 
> a couple 
> > of people using nicads.  Flooded ones, that is - not AA cells!
> > 
> > 
> > David Roden - Akron, Ohio, USA
> > 
> > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 
> > Note: mail sent to the "etpost" address will not reach me.  To 
> send 
> > me a private message, please use "evadm at drmm period net."
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> > Americans are satisfied with things because they are large; and
> > if not large, they must have cost a great deal of money.
> >  
> >                             -- Lepel Henry Griffin, ca. 1885
> > 
> > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =  
>       
> > 
> > 
> > 
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