----- Original Message -----

From:

To: NEDRA@yahoogroups.com

Sent: 1/18/2007 5:32:18 AM

Subject: [NEDRA] Horse Power per Pound?

Hi guys...

 

New to this forum and have an interest in electric drag racing...but of fairly short times and distances....which makes it much more practical and safe and cheaper as well...

 

Lets take a a pretty small vehicle...something along the lines of 300 to 600 pounds..so thats something like a small bike or go kart like vehicle with one person in it...

 

Now, we want to accelerate as fast as we can with say a top speed of 40 mph plus or minus 15 or so...

 

Now. I can do the calculations for energy requirements etc etc but what I really dont have a handle on is what is achievable with todays technology at reasonable costs...

 

So, I guess my 2 main questions are:

 

1  If you run an electric motor at really high power for only a few seconds....and allow a long cool down time...or maybe even some sort of active quench cooling...how many HP per pound can you get out of one?

 

2 The batteries...again a really short duration power burst as above...how many amps/volts/watts per pound can you suck out em for such a short time with a LONG pause between burst before you'll start to damage them significantly?

 

So, questions one and two really combine  to answer the REAL question which is how many HP per pound can you get out of a electric motor/battery system for a few seconds? Also of interest would be how many HP per DOLLAR for the same set up...

 

Thanks in advance for any info

 

BLLL