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Battery powered 7
lsteele - 31/1/06 at 11:31 AM

Hi,

A couple of years ago when first researching sevens I found a site on the internet detailing an attempt by some guys (in the US I think) to build an electric (i.e. battery powered) seven-type car.

I can't find the site anymore, but it sounded interesting and I wanted to see how it turned out. Does anyone know what I'm talking about, and happen to know what the web address is?

Thanks!

JonBowden - 31/1/06 at 11:34 AM

the address I have is http://www.electric7.com/
However, when I tried it just now, the site appears to be down

Gav - 31/1/06 at 01:32 PM

I've seen a video of this car somewhere, racing a Porche GT and Ferrari 360(?) and it beat them both convincingly.

akumabito - 31/1/06 at 02:56 PM

Electric cars can have amazing acceleration because the maximum torque of electric motors is available the moment it starts spinning..

In the US there is a special drag racing class for electric vehicles too, governed by the NEDRA http://www.nedra.com/

Too bad electric vehicles usually tend to have a short range...

pdw709 - 31/1/06 at 02:58 PM

Try

http://wrightspeed.com/.

Basically an Arial Atom with an electric motor......Not really a kit as such but what the hell!

Phil

Hellfire - 31/1/06 at 03:04 PM

Isn't half the fun - the noise? Am I loosing the will to live? Probably!

pdw709 - 31/1/06 at 03:13 PM

quote:
Originally posted by Gav
I've seen a video of this car somewhere, racing a Porche GT and Ferrari 360(?) and it beat them both convincingly.


The Arial Atom I mentioned has demonstrated 0-60mph in ~ 3 seconds. Although to be fair, pitching it against a Porche GT and Ferrari 360 is rather unfair, as the Atom is a glorified roadlegal dragster. I wonder which one would win over a longer distance? The figures give it a range of 100miles on the urban cycle, which means you would get far less if driven quickly.........


Some more specs:

3-phase AC induction motor, 236hp at the motor shaft
• 182 ft lbs torque at the motor shaft, from 0 rpm to 6,000 rpm
• 13,300 rpm rev limit
• weight 1,500 lbs
• no clutch, single gear ratio 8.35:1
• Quaife limited slip differential
• Alcon front calipers, 4 piston
• Dymag Magnesium Alloy wheels
• inboard Bilstein race dampers, Eibach 2-stage springs
• steering: rack and pinion, 1.5 turns lock-lock
• Lithium Ion battery pack

Performance

• 0-60 ~ 3.0 seconds
• Standing quarter mile ~11.5 seconds
• Top speed 112mph (electronically limited)
• Range >100 miles in urban use
• Charger: onboard conductive. Input 100-250V 50 or 60 Hz. Current: user adjustable up to 80A
• Energy consumption 200 WHr/mile in urban use, equivalent to 170 mpg (33,705 WHr/gallon)

Using a similiar set up, I suppose you could also get good performance with the motor in a seven.

Phil

robertwa - 31/1/06 at 03:48 PM

There is an 'electric powered' section on the LocostUSA forum - there may be stuff in there......

http://www.locostusa.com/forums/

Well just checked - there isn't much there, but worth a look all the same

Rob

gingerprince - 1/2/06 at 04:36 PM

quote:
Originally posted by Hellfire
Isn't half the fun - the noise? Am I loosing the will to live? Probably!


If all you want is the noise then it shouldn't be too hard to sap a bit of the battery power to blat engine noises from a speaker

Or better still, a stick through the spokes ala your BMX when you were a kit