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
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
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