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Hi Bill,
I'm relieved. I won't have to mortgage the house until the technology
advances enough to reduces the weight by a factor of 5. Currently it
looks like I would need about 1400 lbs of batteries. Get it down to
280 lbs and allow 100 lbs for the electric motor and my W&B will work
out about right. :)
I'm looking forward to seeing what you come up with for the aircraft
batteries.
Bob W.
On Wed, 05 Jul 2006 23:23:24 -0600
"BillDube@killacycle.com" <billdube@killacycle.com> wrote:
> 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/
> >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/
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