Ok, I am not sure if this is the right category to post this in but I am a mechanical engineering "sophomore" student and I want to try my own project, so here goes: I want to build a Go-Kart/Electric Car, I don't need everything to be perfect yet but I just want to make sure the calculations I am running are okay. I started out from scratch by assuming that all the masses of/in my cart would be multiplied by gravity. So running a quick inventory on what my bare average weight will be: 4 x 5HP Motors = 4 x 83 lbs = 332 lb or 151 kg 400 lb occupant capacity = 182 kg 4 x 10kg wheels/tires = 40kg Material making up the actual car = 40kg (No braking system or steering system accounted for yet but that's fine.) Total = 413kg Total Weight = (413 kg) * (9.8 m/s2) = 4047 N Now 1HP = 746W so (4)*(5HP)*(746W/HP) = 14920W (14.92kW). 14.92kW = 14920(J/s) and 14920(J/s) = 14920([N*m]/s) and 14920([N*m]/s) / 4047(N) = 3.7(m/s) * 3600(s/h) = 13.32(km/h) / 1.6(km/mi) = 8.3 mph Are these conversions being used correctly? Am I therefore correct in assuming that at full motor capacity if one motor is attached to each of the four wheels that the vehicle will be able to travel a maximum speed of 8.3 mph?