Originally Posted By: paul
and if you let the box rise more you could get more energy out from buoyancy.

Not in Momos's system because it's already rising to the top of the column of water. If he'd had it rise half way, then you'd only need half as much energy to compress the spring at the top of its cycle. But also only get half as much energy out of the generator. So I think in Momos's system it doesn't matter how high you let it float, or how high the tank of water is. As long as the former is no more than the latter of course :P

I suspect this is the same with the HHO, but still can't see how the numbers add up.