It really is a balance between acceleration and top speed. Your figures don't
sound that much different than my motorcycle. Mine won't even move without
pulling 100 battery amps to get it started, and I top out at about 60 mph. I
can maintain 40 mph pulling about 100 battery amps. That's at 54 volts with a
14 to 41 gear ratio. Accelretion is fine, although a bit slow for a
motorcycle, more like an econocar.
If I were you I would get some more data before deciding you need to make a
change. Just be careful not to overheat your motor. If it is cooled by an
internal fan, running it faster will also help keep it cooler, so maybe you
need to get it out and run it at a higher speed. I am not familiar with the
motor you are using. Is it the drive motor from an electrak? If so, it seems
like it would be decent choice but I really don't know.
How easy is your motorcycle to push? Getting it to roll real well can make a
big difference.
damon> Date: Fri, 8 Feb 2008 17:09:27 -0500> From: [EMAIL PROTECTED]> To:
[email protected]> Subject: Re: [ElectricMotorcycles] bmw
conversion update - update> > I got home today and thought I'd try to get some
real data. The only > hard flat surface I have is the basement, so I did a few
startups down > there with voltmeter and ammeter. I opened the throttle until
it started > moving and by the time I crossed the floor it was pretty
steady-state- > maybe 2 MPH. So I had 100 battery amps and 300 motor amps. I do
believe > if I was out on a flat long run I would be able to keep accelerating
and > drop the throttle back slowly to get to a reasonable amperage. I may >
have to trailer it over someplace and give it a shot. If nothing else it > may
help give me a feel for what gearing I will need. Are there any > ideas on how
I can translate my readings with the current setup into > what gearing I will
need?> > - SteveS>
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