If I have a vehicle (V1) with one 100 kW engine and an identical vehicle (V2) with 2 of these 100 kW engines, will this mean that V2 will have double the torque of V1 and double the top speed of V1?
It's not like in a series circuit in which, when you have two identical batteries in series, the the voltage doubles.
I'm guessing that there will be some increase (but not double) in torque, but the top speed would remain the same between V1 and V2 whilst pulling an identical load. I suspect that the difference between V1 and V2 will be that V2 may be quicker to achieve the top speed, but the top speed won't increase by much. I.E. V1's max speed pulling 30 kg will be 20 kph but might take 10 seconds, but V2s max speed pulling 30 kg will be 20 kph but might take 8 seconds.