Mon, 16 Jun 2003 12:29:11 +0200, <[email hidden]>, "John Smith"
Quoted message said:Just wondering if such a thing exists. Seems a shame to waste all that potentially useful energy...
Plus, such a gadget would multiply the greenhouse-gas reduction resulting from the use of bicycles.
Arthur
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[email hidden]
The East Van Chopper Festival was a block party held over the weekend. The sound system for the
event was pedal powered for ten solid hours.
Four different machines and at least a hundred pedalling persons were used to turn the electrical
motors that were gizmoed into generators.
One rig was a road bike on a trainer with the motor pulley attached right to the resistance wheel.
There was a pile of black rubber dust generated as well.
A second machine was a bicycle whose rear wheel had been replaced by an aluminium flywheel turning a
pulley wheel on the motor. It too was attached to a trainer stand.
A third machine was an old front wheel drive stationary exercise machine. The resistance wheel drove
the motor pulley.
There was a recumbent device that I didn't investigate very closely. It had an office chair and
laptop computer attached where proper bicycle steering and seating devices would normally be found.
Ideally the voltage was maintained between 13.5 and 14.5 volts. This charged a battery. When we'd
hit 15 volts the circuit would cut out.
It's a low budget experimental development cobbled mostly from scrap. The next rendition will use
the excess voltage to power lighting effects.
With 3 cyclists it was easy to let the voltage drop below 13.5 during louder passages of the music.
One planned improvemt to the system will incorporate a voltmeter for each bike. A larger event will
likely require more cyclists, dynamosaurs, and generating rigs.
--
zk