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So we been in EEC for years, & still Max. 200W for 1 person bike, small petrol bikes still need licenses, still 70 mph limit on 2-carriage way.

is it like some e-bikes, need to get up to speed 1st, then turn on?

Yes; I like a bit of Scotch whisky, 1 kinot change the laws of physics, Jim; electric tension (voltage) = speed of motor. If 1 tries to use more volts, any additional are just turned into heat. Then It's too much for her to handle. She'll blow! Jim. So impulse power is used...just like on...

I answered some 1 who asked what 1 would gain by using 2 × voltage, I said that = 2 × the power, but that = only a rise in speed of 10 to 13. Now I see that if 1 goes @ the same speed as before, 1 gets the square root of 2, or about 1·4 × the power. (as well as the 2× voltage being used ½ the...

I'm thinking other way; don't care much for the law, but now find mine Izip I bought on Ebay = not good for going up hills, even tho' I read it has 450w motor. = it no more powerful than my Zipper Z3 @ 200w? Thinking of fitting rear light I've from 70s to + to car, just change bulb for 24v lorry...

Som1 posted where to get 1, ~= £250 inc. p&p. 11Ah instead of 10. 1 should expect to charge every night if used every day.

I'm thinking of doing this + mine Izip, I'd bought 48 volt 1kw rear wheel kit sans battery 1st. In theory voltage ~ speed of motor, but too much could over-heat it. & even +2 times power, you'd only get 13 mph, if it needed all its power to do 10.