[Pil-pc-oceania] Bike Moves

[adam at energybulletin.net]

i have some photos somewhere of a bicycle powered gig in japan which a
permie friend helped organise, can't find right now.

He couldn't remember how much energy was being produced.  But I think you'd
be lucky to get 100 watts of useful energy out of anyone for anymore than
half an hour.   I know that 200 watts = hard yakka, like running up stairs,
but there are going to be losses in friction and translation to electrical
energy, so producing 100 watts of electricity would be hard work.  A small
PA amp is rated at about 400 watts, although it may use a lot less on
average.  My 100 watt amp runs at about 17 and doesn't change much from high
or low volume.  So probably two-three people riding in shifts could power a
small gig.

But given that it takes 10 joules of fossil fuel energy to produce one joule
of food in Australia (more or less), if you're eating industrial food to
power the bicycle, would you really be saving energy?  ;)

adam


On Sun, Mar 30, 2008 at 7:06 PM, David Arnold <arnold.vt at gmail.com> wrote:

> adam,
>
> this music gig looks great.  do you know if they actually powered the pa
> with human power?
>
> dave
>
>
> On 28/03/2008, adam at energybulletin.net <adam at energybulletin.net> wrote:
>
> > not sure if folks saw this, a bike-moved, solar powered gig in melbourne
> > this weekend:
> > http://www.velorock.net/
> >
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>
> David Arnold
> Permaculture Designer
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