Also for the shunt motor of the killacycle... I have been tinking about the same idea while seeing the poor performance and the guy of the ATV that was unable to do better to compete with the best honda gas ATV...
he said that it had two 2kW DC motor.. in my book.. that mean 6hp... no more!... so with two 15hp Etek or two motor like the killacycle !!!!
EDIT: Checked out my Discovery Channel guide on satellite. The Discovery Channel I get isn't showing it. . On the other hand, MythBusters marathon is on today !
Just watched it on youtube, was a fun test, it is aimed at kids though? and there are a whole bunch of iffy statements in there, esp regarding his battery pack, still its a good machine if a little ugly? seems a bit box like? I agree it needs more power and a bigger motor, its a fun thing to watch though so here is the link.