   vehicles : relation between motor torque and maximum velocity ?
  HelloI wonder if there's a relation between motor torque and maximum velocity.Given the vehicle mass m and wheel radius r, I (think to) know how to calculate acceleration : torque/(r*m), but not the max velocity ...Is there a way to do this ?Thanks   
  Maximum velocity is not determined solely by the torque. In a frictionless system, for instance, maximum velocity is infinite.Maximum velocity is reached when the driving force equals the sum of the forces resisting motion. (friction of the wheel bearings, friction within the engine, wind resistance due to the shape of the body, friction of the tires with the road, etc.)Simplistically,F = MAwhere F = Ftorque - Ftires - Fwind ..When the resistive forces equal the driving force, F = 0, A = 0 and maximum velocity has been reached.   ;  << Maximum velocity is reached when the driving force equals the sum of the forces resisting motion >>ok thank you   ;  I think its something like...F_resistance = K + W * v^2;Where F_resistance is the resistance force,K represents rolling resistance coefficient,W is the air resistance coefficient, andv is the velocity.Now, your top speed will be reached when your motor can push the car with the same force as this resistance force.By your equation...F_motor = torque / r;Therefore, for max velocity...F_resistance = F_motor;K + W * v^2 = torque / r;v^2 = (torque / r - K) / W;Hope that helps, and I hope it is correct.