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Old Feb 19th 2013, 03:27 PM   #1
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Talking Upper limit to size of Air Supported Structure

Hey yall! Im new here, and I'd like to ask a question I can't seem to get an answer to anywhere else, so why not get it here! I'll get right to it! The question is...What is the upper limit of an air supported structure, and what is the maximum safe pressure inside said structure? Can they simply be made as large as you would like? or is there limits such as outside wind force, inside pressure of the structure relative to overall weight of the structure, the structure tearing from the immense forces created by rising air, ect. please list the equations involved in your anwser, thanks!
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Old Feb 20th 2013, 07:06 AM   #2
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This question does not have a simple answer. I assume that "air supported structure" means "lighter than air vehicle," such as a derigible or balloon, right? You may be familiar with the zepelins that were constructed back in the early 1900's - they were several hundred feet in length, and the largest (the Hindenburg) was over 800 feet in length. Your question really has to do with how to design a structure to withstand the expected wind loads, and that has no simple answer - it's like asking what's the maximum size of a building.

As for internal pressure - actually what you want is as low a pressure as possible while maintaining the shape and violume of the balloon - the lower the pressure the less gas is inside the airship, and hence the lighter it is and the more lift you get from the atmospheric air. In practice a pressure a bit more than atmospheric is needed inside the balloon or derigible in order to maintain its shape and volume. But there's no advantage to making the pressure higher than that.
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Old Jun 7th 2013, 10:22 PM   #3
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I am very happy with this mail list... i found very good tips...

Now I am modelating a air supported structure (Is a personal challeng to
do a new investigation area in my institute)....
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