On Mon, 15 Oct 2007 16:32:10 -0700, Jim Thompson
On Mon, 15 Oct 2007 16:23:39 -0700, John Larkin
[snip]
No,he's right;those wheel spinners use low friction bearings,and any
crud will stop them.
So, you won't do the math either.
John
Math without practical experience is useless.
Practical experience without math is amateur guesswork.
John
John, I think you've got yourself out on a limb, on the wrong side of
the saw ;-)
I think it's you who has to put some numbers to it.
...Jim Thompson
I already did. And Guy confirmed it.
John
Macon?? That's almost as good as having "...bored..." do it ;-)
No, MissingProng can't do math at all. He's entirely number-phobic.
I think you need a pendulum of _substantial weight_ so that it
_doesn't rotate, but acts as a "pinning" point for the piston(s).
That could work, too. But we'd need a small amount of energy per day.
I'm guessing 1 kilojoule would be plenty - and easy to get - based on
the performance of a little cigaret-lighter-plugin compressor I have.
The bling-spinner idea was cute, and would be a nice sales gimmick.
What
weight does it take for a 1/2" piston working against 30PSI, and what
are the respective arm lengths?
Why 1/2"? The amount of air we'd need is tiny.
I'm not going to design it, much less build one to prove something to
rude strangers, but the numbers seem well in the ballpark of
feasibility. That's the first step in engineering, a quick numerical
estimate to see if an idea has a chance of working. This one does.
John