[suicideneil]

HP per metric ton is always a nice thing to know, but you need to have the rtr weight in lbs or kilos in order to calculate it:

3.5HP x weight in kilos
1000kg / weight in kilos = ??
?? x 3.5HP = ??? HP per ton.

Apparently though, speed doesnt scale like size does, theres some wonderfully tricky calculation to work it out instead...