Hybrid Car – More Fun with Less Gas

Storing wind-generated energy as gravitational potential energy? - Page 20

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Posted by unopened on December 8, 2008, 10:06 am

Doctor Diesel originally tried to build an engine using coal dust as a


Someone else has thought of it (the halfbakery is a good site for
wasting time)


More recent work referenced here:




Posted by robgraham on December 7, 2008, 7:21 pm
On 7 Dec, 16:33, "The Medway Handyman"

Hmm - that 'll be same flour as in your 'flour essence' lights then;
seems then that bags of milled wheat might be the solution to our
lighting then !


Posted by Vortex3 on December 7, 2008, 3:47 pm

OK lets run with it.

Suppose you could build a machine that could lift a 100 ton weight 10 metres
with 100% efficiency.

Suppose you could then recover that energy with 100% efficiency.

The "potential energy" once it is fully lifted would be:

m * g * h  = approx 10 Megajoules = under 3 kilowatt hours.

A typical home probably uses at least 3000 kwh per year.

A 100 ton weight would mean about a 4.7 metre cube of concrete.

Something in the back of my head says this is not practical.


Posted by Andrew Mawson on December 7, 2008, 4:03 pm

10 metres

You need two large ponds, one at a low level and one at a high one -
the higher the better. See:
http://www.fhc.co.uk/dinorwig.htm  for an application.


Posted by Robert Copcutt on December 7, 2008, 5:12 pm

Yes, and the next stage is to do it at sea. See

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