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| Brian taking over, me (Todd) behind bike, 11/17/2007 |
Today I then took the bike out for some careful loops that grew in size until I ended up riding to the hardware store for some (more) bolts. It was all good, but I can't quite hit 20 mph, which is a bit low for being in traffic on any roads without speed humps. I also came across the police who didn't bug me about a lack of running headlight or my speed since I was on a "humped" road at the time. The motor and pack were nice and cool for all the runs, I am thinking the gearing could be increased (go from 10 to 12 on front) because acceleration is crisp and top end is so low. I need to get the iPAQ datalogger going asap..
SO I ordered 2 more batteries and 2 more chargers. 48 Volts might be it for some time, I seriously doubt the wife will let the riding go on much longer, but I want the machine in a sellable/useful state before I move on. Going 48 Volts will also make using the DC-DC converter possible.
I also ordered a 550 lumen CREE 3xLED flashlight includes batteries, a charger and remote switch. I was unable to locate bulbs alone, but modding or retrofitting the light is certainly possible. An H4 bulb puts out about 1000 lumen, so a second bulb/light might be the final say here - though a cheesey H4 HID upgrade might be the easy path.
Another note to self - check for possible tax credits/writeoffs.
4 comments:
Please post some photos of the vehicle. sounds great.
Why more teeth? To make it go faster? Isn't top speed set by:
power loss = battery power?
And, power loss would just depend on speed. If the motor would be more efficient at lower rpm then, OK, more teeth. But it's running pretty slowly at 19mph, so would that be true? More teeth => less acceleration, same speed, no?
More teeth on the back is for acceleration without spiking the amps to a level that will fry the motor.
Amp ratings/capacity are everything for electric motors - that infinite torque at start is not free.
And yes, the big ring does affect top end. Adding voltage allows the motor to spin at higher RPMs, again to a limit dictated by amps over time - go too high and again the motor can fry. A 72 volt machine can go 60 mph or more, but the motor is only rated at those amps for 5 or 10 minutes max before melting/flying apart.
Oh, no EV tax writeoffs since 2006, and then it was only for 4 wheeled varieties from OEM manufacturers - NO conversions, rat bastards.
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