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Originally Posted by Mysteryfish
I'm trying to figure out how some kind of custom jerry rigged manometer type setup might help him gauge relative pressures...
That, combined with some denser liquid, might be able to at least give rough estimates of output pressure...
I just forsee the quick acceleration of the air forcing jets out of the tubes...
Any ideas?
Also, Madmax, that not "know how"... "know how NOT", is one of the funnier (and more reassuring) things I've heard in a while. School's getting a bit tougher... :banghead:
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Wait until you leave engineering school thinking you can actually design a car.
Manometers aren't really quick acting enough. They're good for measuring static pressures, but if you have to rapidly accelerate a slug of liquid to reach an equibrium height, the density of the liquid gets in the way of your measurement. You also have flow resistance issues in the tubes.
I'm not sure how industry measures very high and rapidly changing impulse pressure. I would guess that it's easier to use a strain gauge or piezo transducer in the cylinder head to measure how hard it's being pushed out of the cylinder before the piston slams into it to determine pressure. I would guess that the force exerted by air pressure is pretty small compared to the impact force when the piston hits. It may be difficult to prevent a gauge sensitive enough to measure the air pressure from being damaged when the cylinder head is struck.
Still, all this discussion is just jibba jabba until you get into a proof of concept or start making direct measurements on your AEG. All the king's paper and all the king's pens couldn't get their theoretical masturbations to do anything useful again.