Oznog

I heard from a guy telling how great this new amateur-invented backyard hydroelectric generator is supposed to be. 2KW from 8" of head.

I had to do the math on this one, since it's all easily calculable. The numbers get pretty... implausible.
I went ahead and posted it under the PESWiki entry for posterity, titled "Performance Calculations":
http://peswiki.com/index.php/Directo...ydro_Generator

I hope I didn't make any math errors. I did try to double check it.

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I thought what I'd do was I'd pretend I was one of those deaf-mutes.

Pommie

I can't do Lbs Feet etc.

In metric it comes out slightly different

Joules = Mass * Height * Gravity

2000 = M * 8*0.0254 * 9.81

M = 1003Kg = 1003 Liters = 265 Gallons

Close enough.

Mike.

dknguyen

I think a slug is the most ridiculous unit to ever walk the Earth.

Oznog

The metric system is the tool of the devil!
My car gets forty rods to the hogshead, and that's the way I likes it!

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I thought what I'd do was I'd pretend I was one of those deaf-mutes.

ljcox

I gave imperial away as a bad joke 40 years ago.

12 inches in a foot, 3 feet in a yard, 22 yards in a chain, can't remember (and don't wish to) how many chains in a furlong, etc.

12 oz in a lb, 112 lb in a hundred weight, etc.

16 fluid oz ina pint, 2 pints in a quart, 4 quarts in a gallon.

What a ridiculous system!!

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Len

Nigel Goodwin

Obviously true!.

There's 14 oz in a lb!

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ljcox

Oh, is there? That shows how long it is since I used the stupid system.

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Len

Nigel Goodwin

You also forgot to mention:

12 pennies in a shilling
20 shillings in a pound
21 shillings in a guinea

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Pommie

Are you telling me that a quarter pounder only weighs 3½oz. No wonder I've been losing weight

Mike.

Nigel Goodwin

Actually, I was wrong as well!.

There's 16 oz in a lb
and 14 lb in a stone
(probably!)

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ljcox

Yes, you're right. I'd fotgotten about stones.

Also the British ton is 2240 lb but the Amercian ton is 2000 lb!!!

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Len

Oznog

An ounce of feathers is lighter than an ounce of gold.
However, a pound of feathers is heavier than a pound of gold.

The first statement is odd enough- the second being contradictory is just absurd.
Yet both are completely true.

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I thought what I'd do was I'd pretend I was one of those deaf-mutes.

ljcox

Of course they are not true.

The weight is the same in both cases.

However, it may be more difficult to lift a pound of feathers as they will fill a larger volume thus making them feel heavier.

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Len

Nigel Goodwin

I feel you're missing the point! - gold is weighed in 'troy ounces', not normal ounces - and they are different. Don't know if 'troy pounds' exist or not, it's not something you really measure gold in!

BTW, the use of 'feathers' was a trap you fell into, he could just as easily said 'lead'.

__________________
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ljcox

Yes, I had forgotten about troy weight. But I feel it proves the point I was making about it being a ridiculous system.
No, if you re-read what I wrote, I said it may be more difficult to lift due to the volume (not the weight), ie. it would be a larger container that would be more awkward to lift.

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Len