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Date: Wed, 05 Jul 2006 23:23:24 -0600
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: "BillDube@killacycle.com" <billdube@killacycle.com>
Subject: Re: [FlyRotary] Re: Nothing to do with Rotary Engines, but....
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At the moment, about the best that commercial Li-Ion rechargeable 
cells can do is about 200+ W-hr/kg.

In more familiar units, this translates to about 1/2 HP for an hour 
for each pound of batteries carried. Basically, the weight in pounds 
will be twice the HP times the number of hours that you want.

Good for a motor-glider, but that is about it.


Bill Dube'


At 07:45 PM 7/5/2006, you wrote:

>Really was something to see that Bike burn out...
>
>Or may even to skew Bob's comment some, How about 175hp for 20 minutes, then
>125hp for 4 hours, with a 30 minute 175hp reserve.
>
>Tony Snow (Bearhawk #753)
>
>-----Original Message-----
>From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
>Behalf Of Bob White
>Sent: Wednesday, July 05, 2006 9:01 PM
>To: Rotary motors in aircraft
>Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but....
>
>
>Very impressive indeed.  Another one or two orders of magnitude
>improvement and we can forget the rotary and just put an electric motor
>up front (or out back if you're so inclined).  Now that would be
>simple, reliable, and quiet too boot.  How about it Bill?  Can you give
>me 175 HP for 4-5 hours in 200 lbs or so?  (Damn the cost, that would
>be worth taking out a new mortgage on the house.) ;)
>
>Bob W.
>
>
>On Wed, 5 Jul 2006 20:36:29 -0400
>"Ed Anderson" <eanderson@carolina.rr.com> wrote:
>
><snip>
> >
> > Very impressed with your electric drag bike endeavors - got to be almost
>as
> > good as flying a rotary {:>)
> >
> > Ed
> >
> > Ed Anderson
> > Rv-6A N494BW Rotary Powered
> > Matthews, NC
> > eanderson@carolina.rr.com
> > http://members.cox.net/rogersda/rotary/configs.htm#N494BW
> > ----- Original Message -----
> > From: "Bill Dube" <William.P.Dube@noaa.gov>
> > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > Sent: Wednesday, July 05, 2006 7:50 PM
> > Subject: [FlyRotary] Nothing to do with Rotary Engines, but....
> >
> >
> > > This has absolutely nothing to do with rotary engines, but I thought I'd
> > > show you what has been distracting me from my airplane construction as
>of
> > > late.
> > >
> > > For those of you that don't already know, my other hobby is drag racing
>an
> > > electric motorcycle. (It takes a team of people to do this, not just
>me.)
> > > We recently managed to get sponsorship from A123 Systems. These
>batteries
> > > are like "Mr. Fusion" in the movie "Back to the Future." Enormous power
> > > and a bottomless pit of energy. The more I work with these batteries,
>the
> > > more impressed I become.
> > >
> > >    Here is a clip of the bike doing a burn-out:
> > >
> > > http://www.killacycle.com/Burnout.wmv
> > >
> > >    Here is a clip of the bike turning parts of  the rear motor into
>molten
> > > copper as it goes down the strip:
> > >
> > > http://www.killacycle.com/Second%20Run.wmv
> > >
> > >     We can do six burn-outs and six runs without recharging if we cared
> > > to. Maybe seven.
> > >
> > >    The 170 battery pack puts out over 350 HP. The battery pack is 376
> > > volts, 1350 amps, and has 18.4 A-hrs. We charge up in about 15 minutes
> > > after every run.
> > >
> > >    I plan to start building airplane batteries with them soon, by the
>way.
> > > It will be late Winter, probably. A123 Systems batteries are ideal for
> > > aircraft. They are lightweight, powerful, robust, long cycle life, and
> > > very, very safe. I'm pretty sure I can build a battery that will crank
>500
> > > amps, but will weigh less than 3 lbs.
> > >
> > >    I guess it had something to do with airplanes.... :-)
> > >
> > > Bill Dube'
> > >
> > > --
> > > Homepage:  http://www.flyrotary.com/
> > > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> > >
> >
> >
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>
>
>--
>http://www.bob-white.com
>N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
>Custom Cables for your rotary installation -
>http://www.roblinphoto.com/shop/
>
>--
>Homepage:  http://www.flyrotary.com/
>Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>
>
>
>--
>Homepage:  http://www.flyrotary.com/
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