Actually the densitiy of a PbA battery is no where near the density of lead, especially when you are talking about YTs. A YT weighs about 45 lbs. A 45 lb chunk of lead with the same footprint (10"x6.8") would only be approx 1.8" thick.
Chris Tromley wrote: >Lonnie Borntreger wrote: > >>So add 150lbs of something to the battery pack (line it with >>lead or something). That way you get the extended range of >>the advanced batteries, but don't mess with the center of >>gravity of the Sparrow. Of course the extra weight will >>reduce range a little, but not as much as sticking with the >>older battery chemistry - I would guess. >> > >It's not a bad idea, but I'm not sure how far you could go with it. The >density of a battery is pretty close to the density of lead. The amount >of ballast you could add depends on how much space is left for it. > >If John ends up with Li-Ion, he might be able to put a pack together >that leaves substantial space for ballast. He might actually be able to >improve the handling of his Sparrow by moving his cg lower and more >forward. I think it's an important consideration. Conservative driving >is good, but you can be forced into a situation where you have to >maneuver hard or crash. > >Another thought came to mind about this. Do I remember Sheer saying the >Evercels aren't very good for high current draws? How about Li-Ion? >Doesn't the Sparrow's single speed series motor draw big amps? > >Chris > > >
