--- In electricboats@yahoogroups.com, "Tim" <haywardt@...> wrote:
>
> They have been demonstrating this kind of performance for quite some time.
>
> http://en.wikipedia.org/wiki/AC_Propulsion_tzero
I am still skeptical.
The Wiki link says consumption is 180 watt-hr/mile at unlisted speed. For a 300 mile range, the car would need 54 KW-hr. Assuming about 65 KW-hr Lithium battery pak is needed to avoid exceeding 80% DOD, and assuming using the same types of Li-batteries available to us (which weigh about 30 lb/KW-hr) the battery pak alone would weigh 1950 pounds. The article asserts changing to the Li batteries reduced the car's 1040 kg weight by 320 kg. 720 kg is about 1600 pounds. Those numbers don't add up.
Looking at it another way, 28 Optima batteries would weigh about 1260 pounds, assuming about 45 pounds per battery. The article asserts the Li pak reduced weight by 700 pounds, meaning the 65 KW-hr pak weighed about 560 pounds, which is less than 10 pounds per KW-hr. Those numbers don't add up either.
John Casperson
>
> --- In electricboats@yahoogroups.com, "john_casperson" <john_casperson@> wrote:
> >
> >
> >
> > --- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@> wrote:
> > >
> > > http://acpropulsion.com/
> > >
> > >
> > > sounds pretty good.
> > >
> >
> > 300 miles at 60 mph takes 5 hours.
> >
> > Say it takes 20KW to produce that speed. (About 30 hp)
> >
> > Then it would need a battery with 100 KW-hr usable.
> >
> > I am skeptical.
> >
> > John Casperson
> >
>
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