## RE new file, internal pressure = 0.01 psi (?)

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• Jerry, I took a look at your spreadsheet. Can you explain the 0.01 psid internal pressure? Seems high by more than an order of magnatude at launch, at least
Message 1 of 2 , Sep 1, 2010
Jerry,
Can you explain the 0.01 psid internal pressure? Seems high by more than an order of magnatude at launch, at least the way I analyze balloon pressures and stresses.

- Mark ng0x
• It s really a SWAG but I m not sure it is that far off. A 10 meter altitude change is about 0.01PSI. In normal breathing the pressure in your lungs is
Message 2 of 2 , Sep 1, 2010
It's really a SWAG but I'm not sure it is that far off.   A 10 meter altitude change is about 0.01PSI.  In normal breathing the pressure in your lungs is changes +- 0.06psi.

And in reality I don't expect the delta pressure to be that high until you are close to the burst point of the balloon.  Until I can find some better numbers on what the curve looks like as you approach burst I didn't want to guess on the shape of that curve.

From: Mark Caviezel <kmcaviezel@...>
To: GPSL@yahoogroups.com
Sent: Wed, September 1, 2010 6:31:40 PM
Subject: [GPSL] RE new file, internal pressure = 0.01 psi (?)

Jerry,