"Neil Gould" wrote in message
t...
Recently, Larry Dighera posted:

On Tue, 09 Jan 2007 10:19:00 -0600, James Robinson
wrote in :

Larry Dighera wrote:

"Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net wrote:

Larry Dighera wrote:

http://www.teslamotors.com/

Well they say the motor weighs 70 pounds and produces 248 HP but I
can't find anything about the weight of the batteries.

Total weight is indicated as ~2,400 lbs (including air
conditioning). Given its 1:10 power to weight ratio, I'd say, if it
had wings instead of the beefy structure it requires to meet road
safety standards, it would fly. It wouldn't require any fuel.
Recharges fully in 3.5 hours.

The batteries weigh 900 lb., and put out 75 HP for an hour.

I didn't see those numbers on the Tesla Motors web site. Have you got
a source for that information? There is a chart here, but it is more
about marketing than engineering:
http://www.teslamotors.com/performance/performance.php

Your numbers seem to conflict to some degree with these:

http://en.wikipedia.org/wiki/Tesla_Roadster#Battery
Battery:
6,831 Lithium ion battery cells
About 450 kg
Full-charge time of three and a half hours
~56 kWh capacity

I don't have my hp W tables handy... if you do, how does Robinson's info
conflict, given that the weight is about right as "about 450 kg" ~= 990
lbs.


56kW is 73hp. I think the 75 hp for an hour is very close. Not enough for
an airplane in my opinion.

Danny Deger

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