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Gravity wheel of Krstan Pejic. This device works

Started by Shokac, March 26, 2014, 04:09:05 AM

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0 Members and 2 Guests are viewing this topic.

madddann

That's not even too expensive... 587 USD maybe Sterling Allan would buy it  :) .

Quote from: MenofFather on March 26, 2014, 08:30:54 AM
Here sells somthing like this [size=78%]http://ledd.satom.ru/p/1848917-ibp-dom-5000-vatt-bestoplivnyy/[/size]

gyulasun

Hi Dann,

Yes it is a good idea to estimate the wheel sizes from the video and arrive at the ratio.
I wish you good luck.

Gyula

bboj

Quote from: MenofFather on March 26, 2014, 08:20:45 AM
He did not mention, how long for him it work without charge battery?


He said it can ran for as long as batterys life - a few years

Qwert

The thread says "Gravity wheel". Where and how is gravity used in this contraption?

DreamThinkBuild

Hi All,

In the video he mentions his first prototype which is briefly shown @ 2:27. I think this would give a better idea of pulley ratio since it looks like all bike rims are being used.

These are just estimates on the bike wheels from standard sizes which they seem closest too.

Flywheel - 26" diameter
To Alternator - 20" diameter
The small pulleys look to be 1-2" diameter
Drive Motor - 16-18" looks a little smaller than the 20" diameter

Windshield wiper motor is between 30-100rpm depending on voltage, it has high torque since it's wound almost like a winch motor.

Let's go with 40rpm as an example

40rpm @ 18" wheel to 2" pulley = 40*(18/2) = 360 rpm on flywheel shaft
360rpm @ 20" wheel to 2" pulley on alternator = 360*(20/2) = 3600rpm

Please correct if you see a mistake.