Re: e-tek speed ratings

[Dylan Pfeifer <dcpfeifer@earthlink.net>]

While the E-tek motor is in on the table, I was wondering if I could drop in a
question that maybe other buyers have...

Suppose I've got an 810 rev/mile tire, and I'm designing it to cruise at 60mph
with the E-tek.  Single gear trans.

Well, the E-tek says "min nonload speed"=3,200rpm, and "max nonload
speed"=3,600rpm.  Not knowing any better, suppose I think this means "can't run
slower than 3,200 rpm and can't run faster than 3,600 rpm."

So say I gear the E-tek with chain and sproket 0.23:1 ( 60mph with 810rpm @
tire and 3,500rpm @ motor).

Well, but if I go 30 mph.  Then the E-tek is going 3,500 * 0.5 rpm, below it's
minimum speed rating.

So what happens... does the motor overheat... blow up.. what.   What happens
also if you exceed 3,600 rpm, say going downhill.

If you are limited to a window of 3,200 rpm and 3,600 rpm on the E-tek, then
your final speed is 88.8 to 100 % of the speed at which the vehicle travels
with the E-tek at 3,600rpm.

Thanks,
Dylan