# Tumbling cylinder?

#### MikeFlanagan

Tumbling cylinder?

I am trying to make a tumbling cylinder using water and compressed air.
My diagram here explains where the problem lies.
http://things50.webnode.com

Please look at it and suggest an answer. I would appreciate it.
Thanks,
Mike
......... @ hotmail.com

#### sooey

Let us know if you ever solve that problem, you'll have found a perpetual motion machine.

#### MikeFlanagan

The thinking behind this is:

A container of high-pressure air can force water upwards, because it's pressure is higher than the water.

At the same time the water is heavier that the air, thus creating a top heavy machine.

So don't take my contraption too literally. Is there a way to get this principle to work? Thanks.

#### Agile

You could make most of that work!

But any energy will come from the compressed air source!

There is a tumbling bucket in my local Indonesian restaurant!

#### sooey

PROBLEM
How to get the existing air pressure to force the water back up again.

#### Tipper

Apply heat...to the lower air space.

It's called thermodynamics!

#### sooey

I suppose you could have a small relief valve at either end to release steam, but then you'd need to be able to top up the water too. Getting complicated.

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