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Posted by Neo on January 9, 2010, 10:48 pm
 



That's really awesome..
Those one man electric gokarts on youtube look incredibly fast!
BTW -- How does that thing stop?

With something that fast a speedometer would be useful
in safely negotiating turns.   An odeometer would be useful
in helping you figure out when to recharge the batteries.



Posted by amdx on January 10, 2010, 12:00 am
 




 It has a drum brake on the rear axle. You can lockup the wheels
without to much effort. But we recently put 4 group 27 batteries
on it so it is heavier now and the drum gets pretty hot after a run.



  I put a bicycle speedometer on it but it never worked right.
It is the type with a magnet mounted on the wheel and it counts
revolutions/time. It seemed to work to about 25mph then as you
went faster the indicated speed reduced.
  You can watch the voltmeter as you ride and have a pretty good idea
about the charge.
                                   Mike





Posted by Bob F on January 11, 2010, 9:30 pm
 

amdx wrote:


It is obviously designed for larger wheels, so it probably can't process pulses
that fast.



Posted by amdx on January 12, 2010, 12:21 pm
 




Posted by amdx on January 12, 2010, 12:36 pm
 



  Yes one might think that, but the unit is programable for wheel
circumference,
and it does go down to my gokart wheel size. At 40 MPH the speedometer will
only see 20 pulses per second, doesn't seem very fast to me.
 All that said, just because I can program the tire size doesn't necessarily
mean it
will work at the faster pulses.
  I guess if I got motivated, I could build a sensor and a divide by 2 to
drive the
speedometer input. That would be the same as a 24" wheel.
                                                  Thanks,   Mike



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