Duncan, I think the regulation means 4000 W at the rear wheels. If that can be accomplished by by a small motor with high Ampere or a big motor with lower Ampere is exactly what I hope to learn at this forum.
All I know is that in the Netherlands you have the pedelec class which is 250W, then the s-pedelec which is 500W and the next up is the moped class which is max 4000W.
As a 250 W can propel a bike to at least 25 km/h, and a 500W goes up to 45 km/h if you cycle along, I expect my 4-wheel kart to go somewhere around 80 km/h. Which is too much legally so I have to limit the speed somehow to 45 km/h, maybe 50 if I take into account the margin the police subtracts for measurement error.
All I know is that in the Netherlands you have the pedelec class which is 250W, then the s-pedelec which is 500W and the next up is the moped class which is max 4000W.
As a 250 W can propel a bike to at least 25 km/h, and a 500W goes up to 45 km/h if you cycle along, I expect my 4-wheel kart to go somewhere around 80 km/h. Which is too much legally so I have to limit the speed somehow to 45 km/h, maybe 50 if I take into account the margin the police subtracts for measurement error.
