foot pedal power

Mike Dawson mikeofmanchester at
Sat Jan 22 15:19:06 EST 2011

Hi All,

Such a device would need adaptation for the OLPC to be possible for
kids (particularly those in the developing world) to use.  We found by
experimentation with weights that kids 8-12 average max sustained
power applied against gravity was around 11W.  They would need at
least +50-80% of what this thing actually generates to account for
energy lost to heat / noise etc.  That would be fine for a New York
office worker who bikes to/from work, but not kids out here.

The principle though is really exactly what I had in mind when I get
around to making the next prototype out here...

Given that it's making 60-80W of power it's safe to assume if it's 70%
efficient you're talking about needing 100W of actual energy.

Given a 10kg weight (pretty heavy)

Work = Force x Distance
100W = (9.81 x 10) x 1m

You would have to move a load of 10Kg up a meter every second.  You
could test this by taking some old style scales and putting a weight
on one and then using your foot on the other side to make it go up and
down and counting the number of times it goes up and down in a given



On Thu, Jan 20, 2011 at 7:30 PM, Rafael Enrique Ortiz Guerrero
<rafael at> wrote:
> Talking about human power..
> potenco  version2.
> Rafael Ortiz
> On Wed, Jan 19, 2011 at 9:44 PM, James Cameron <quozl at> wrote:
>> On Thu, Jan 20, 2011 at 10:38:59AM +0800, Carlos Nazareno wrote:
>> > I can add it to the wiki, but where should I add it?
>> It's a Wiki, add it where you think best.  Others may move it or link to
>> it.
>> --
>> James Cameron
>> _______________________________________________
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>> Devel at
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