>> > I had it going about 20 mph in the parking lot at 24v. I think it 
>> > will
>> > do at least 40-45 with a proper controller and 48v. I don't know 
>> > about
>> > battery life. It has too much torque, I bent the jackshaft once
>> > already.

> Very nice work!. Imho look into a starting resistor before you build 
> a
> controller. You could ruin the motor without it. A starting resistor 
> will limit

How much current does it draw?
(Startup, accelerate, run, 24V, 48V, ... ).
A PWM:: controller is not out of the question at even 100 - 200 amps 
and would greatly ease control. A bank of quite cheap FETs would do 
the honours. Essentially a buck converter. FETs are probably also the 
cheapest reasonable "flyback diode".

You could also try "bank switching the battery for starting. Assuming 
a 2 x 12V battery then either 2 batteries in parallel or (naughty but 
effective) just one battery. If the latter you could swap them around 
electrically occasionally and/or charge them separately.



        Russell 

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