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brian-1927(at)lloyd.com
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 Posted: Sun Sep 16, 2007 6:43 am Post subject: UOTE Re: MF'ing air system! Yak-50 |
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On Sep 15, 2007, at 7:14 PM, Craig Winkelmann, CFI wrote:
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<capav8r(at)gmail.com>
Doc:
Gotta give it to ya...pullin' out those old textbooks. I've packed
mine away. However, from my engineering days, you are right on
with Mr. Bernoulli. Air is a "fluid" that is in motion, hence his
law applies.
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Of course it applies and equally, of course, it doesn't matter. We
are dealing with a sudden transition, air, and such a large pressure
differential that we don't need to analyze it that much. We know
empirically that, a) given a hole of size 'x' and, b) a pressure
differential of 'y', that the flow will be 'z'. (BTW, this is how
your compression tester works.) The key here being that 'z' is a lot
smaller than what we want and the solution is to just make 'x' bigger.
So Tim, getting back to the MF'ing Yak-50 pneumatic system (which, by
the way, IS where we started), go look to see what is blocking the
flow of air to/from your storage tank (if anything). If something is,
fix it. If not, tell us and we will put our collective brains (the
sum of which might equal 1) and try to come up with another answer.
(Ya know, part of intelligence is knowing when you don't need to
launch a weather satellite -- that licking your finger and sticking
it up into the wind is sufficient to solve the problem. And, yes, as
a matter of fact I DO violate this principle all too often. 
--
Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
PGP key ID: 12095C52A32A1B6C
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yakplt(at)yahoo.com
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| Posted: Sun Sep 16, 2007 1:22 pm Post subject: UOTE Re: MF'ing air system! Yak-50 |
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Mr. Bernoulli stated that the faster that a fluid moves on or through a surface the less pressure it exerts on that surface. Any time a fluid moves on or through a surface, (such as air through a tube) then of course Mr. Bernoulli's law applies. The question is, what does it apply TO? Further, does what it applies to have anything to do with Tim's problem?
In most cases Mr. B's law applies to wing surfaces, venturi tubes, etc. It addresses the speed and pressure and volume of air masses flowing ON OR THROUGH something.
Now.. take a small pipe of say 1/4" diameter, and feed it with a regulated supply of say 3000 PSI of air with standard day density. Have it connected to a piston actuator with a 2 inch diameter. Have the piston lifting a 100 pound load. Disregard friction losses in the piston. How fast will the piston move?
Now have an 1/8" air line of 10 feet connect to the above example with the 1/4" line. Will the piston move:
A. Faster
B. Slower
C. Stay the same speed.
If faster or slower, by how much?
Show proof please.
Anwser this question using strictly Bernoulli's Law.
Go for it Doc.
Mark
"Craig Winkelmann, CFI" <capav8r(at)gmail.com> wrote:
[quote]--> Yak-List message posted by: "Craig Winkelmann, CFI"
Doc:
Gotta give it to ya...pullin' out those old textbooks. I've packed mine away. However, from my engineering days, you are right on [quote][b]
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l39parts(at)hotmail.com
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| Posted: Wed Sep 19, 2007 8:45 am Post subject: UOTE Re: MF'ing air system! Yak-50 |
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You're 0 for 2. Bernoulli's principal has nothing to do with the line
restriction to the bottle and airplane wings use the Coanda effect, not
Bernoulli. Get out your calculator and calculate the amount of "vacuum"
that must exist to lift a wing with loading of 50 psf. Wings can't make
that much lift with Bernoulli.
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