Originally Posted By: paul

Quote:
The force generated upon the release of this air is:
F=[m*Ve]+[(Pt-Pa)*Ae]

Because we don't have a cone, m*Ve is zero. Therefore, the amount of thrust at a full tank is:
F = (Pt-Pa)*Ae
F = (10132kPa-101kPa)*0.00064516m^2
F = 6471N


one load after another...

theres something VERY important when calculating force

--------- YOU NEED MASS ---------


Try looking up the unites within a pascal, moron. A pascal is a N/m^2. A newton is a kg*m/s^2.

kg, BTW, is the mass...

Funny, you're the one who insists on using pressure as a proxy for force, and are not even aware of what the units of pressure represent...LOL

Originally Posted By: paul

F=MA

not

F=whatever you want it to be.


And, if you plug the units for pressure and area into a formula, you get...exactly what F=mA gives you...

Originally Posted By: paul

it looks like your using the initial pressure
in the tank (pt)then subtracting the initial pressure
in the pipe (pa?)then multiplying that number by the nozzle area (Ae?).

so where are you going with this ?


That's how you calculate the force produced by a fluid moving from a region of higher pressure, to lower pressure.

I though that would be self-evident...

Originally Posted By: paul
Quote:
Because we don't have a cone, m*Ve is zero


so since the mass comes out of a tube as you said , the mass has no velocity?


Nope. The air that comes out of the tank is still at pressure when it leaves the tube connecting the pipe to the outside world. If you have a cone-shaped nozzle you can harness that pressure, and use the pressure to accelerate the gas within the nozzle. As the air expands through the nozzle accelerates it, and the degree of acceleration determines the force generated. Ve is measured relative to the speed of the air before it enters the nozzle, and if that air doesn't accelerate, Ve = 0. Any mass * 0 = 0.

Originally Posted By: paul
it just covertly sneeks through the nozzle or perhaps it is being transported as they do on star trek !!


Nope, it obeys the well understood laws of fluid dynamics - the exact same laws used for designing everything from aromatizers to rockets.

Originally Posted By: paul
you know the mass of air.
you know the force , its 100 psi. (believe it or not)


My god, you are dumb. Pressure is not a measure of the amount of force when the air is released - it is a measure of the force exerted on the tank by the air. The two are not the same - a 1000L tank at 100PSI will generate far more force than a 1L tank at 100PSI.

Strange, isn't it, how these simple concepts elude you!

Originally Posted By: paul
all you need now is the acceleration.

a=f/m
acceleration = force / mass


SP ) standard Pressure dry air has a density of 1.2754 kg/m3.

this will give you the mass and the initial velocity for your formula.


What the hell do you think F=[Pt-Pa]Ae calculates? EXACTLY WHAT YOU JUST WROTE!

What you are missing is the area - pressure is FORCE PER UNIT AREA NOT FORCE.

Originally Posted By: paul

now you have the rest of your formula..


No, you've just shown that you cannot read mathematical formulas, and that you don't understand the difference between pressure and force. Pressure is not force, and more than kinetic energy is momentum.

Originally Posted By: paul

but you now have the full formula that you obviously already knew , you just didnt want to allow others to see the outcome of actual numbers , you only want them to believe your twisted math and the endless jargon that flows from your knowlege of what other people said.


I presented the numbers, for every one to see. You, on the other hand, simply displayed your inability to read a mathematical formula.

LOL

Bryan
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