Date: Tue, 29 Jun 2004 16:48:17 -0400


Subject: Re: handcrank a fluourescent bulb?



I recently made a great bike generator. I bought a surplus treadmill motor for $60 and rigged it onto an excersise bike. When cranked hard it puts out almost 100 volts DC briefly. But typically it puts out about 60 v for a sustained period. I use a load of 4 parallel 250 Watt Lamps that can be switched in one at a time. A strong pedaler can generate almost 1 KW for a brief period, lighting all 4 lamps brightly.

An inverter is needed to convert DC into AC and I don't think it wil work easily with variable power? Jerry

> From: "Jason St. John"
> Date: 2004/06/29 Tue PM 02:26:35 EDT
> To:
> Subject: handcrank a fluourescent bulb?
> I got a good one:
> A business student here approached me looking for a way to demonstrate
> that certain Sylvania compact fluourescent bulbs consume less power than
> the incandescent bulbs they are meant to replace. He wanted to compare
> the difficulty of hand-cranking generators to power each of these bulbs.
> Problem is, he'd need to put out 120V 60Hz, regardless of speed, and
> hand-cranked generators rarely exceed 12V. I suggested a generator on a
> bicycle, but he said they want to be able to put this in store
> displays--first in Vermont, and eventually across the nation if the
> campaign takes off. How much would a bicycle-and-generator cost? What
> voltage could it possibly reach?
> Any bright ideas?
> -jmsj
> ____________________________________________________
> Jason St. John 617.353.2634
> Boston University Physics Lecture Demonstrations
> Room 255, 590 Commonwealth Ave. Boston, MA 02215
From Tue Jun 29 16:41:53 2004