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paulrod36(at)msn.com
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 Posted: Mon Apr 18, 2011 3:21 pm Post subject: A couple of questions |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> First question: Given the same number of longerons and bulkheads, would a triangular fuselage be as strong, or stronger than a square or round one? Aeronautical engineers, and those who already found out empirically, and anybody with an opinion, feel free to jump in.
Second question....Several years ago, someone figured out the weights of 4 by 12 (I think) sheets of .016, .025, and .032 aluminum. Does anybody remember them?
Paul R
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craig(at)craigandjean.com
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| Posted: Mon Apr 18, 2011 3:31 pm Post subject: A couple of questions |
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For your second question, Spruce has a good reference table:
http://www.aircraftspruce.com/catalog/graphics/generalaluminuminfo2small.jpg
-- Craig
From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of paulrod36(at)msn.com
Sent: Monday, April 18, 2011 4:17 PM
To: zenith601-list
Subject: A couple of questions
First question: Given the same number of longerons and bulkheads, would a triangular fuselage be as strong, or stronger than a square or round one? Aeronautical engineers, and those who already found out empirically, and anybody with an opinion, feel free to jump in.
Second question....Several years ago, someone figured out the weights of 4 by 12 (I think) sheets of .016, .025, and .032 aluminum. Does anybody remember them?
Paul R
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n4546v(at)mindspring.com
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| Posted: Mon Apr 18, 2011 4:25 pm Post subject: A couple of questions |
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Paul:
You never need a chart if you remember (or write down) that in most books Aluminum is listed (generally) as weighing .10/ lbs per cubic inch. Now I recall 6061-T6 is a bit lighter at .098/lbs per cubic inch.
So you just have to multiply any sheet size: length times width times thickness equals cubic inches of material which is then multiplied by .098 to give you the sheet weight.
Example: 4' x 12' x .016" sheet. 48" x 144" x .016" = 110.592 cubic inches of material x .098 (weight per cubic inch) = 10.838 lbs. per sheet.
Other (general) handy weights to know are:
Steel or stainless steel = .283/lbs per cubic inch
Brass = .307/lbs per cubic inch
lead = .409/lbs per cubic inch
How to remember these numbers? Note all are Chevy engine cubic inch sizes! You just have to remember the AL figure.
Regards,
Randy, Las Vegas
[quote] Second question....Several years ago, someone figured out the weights of 4 by 12 (I think) sheets of .016, .025, and .032 aluminum. Does anybody remember them?
Paul R
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jaybannist(at)cs.com
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| Posted: Mon Apr 18, 2011 4:33 pm Post subject: A couple of questions |
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Paul,
The answer to your question is not a simple one. In the first place, they would not all have the same number of longerons. A triangular one could only have three. A square one would have four and a round one would have four or more. The size and configuration of the bulkheads would also be very different, even if the number of them were equal. You would also have to take into account diagonal bracing and skin thickness. If you are asking about the frame alone, each shape could be designed to have the same strength as the others. A fuselage made of only two longerons can be made to work and to be as strong as any of the other shapes. And the term "strength" in this case is a rather nebulous one. In the design of an airplane fuselage, the practicality of the shape is more important than the theoretical strength of the shape. How do you fit people into the shape? How do you attach the wings and empennage? How do you secure the engine? What are the aerodynamic characteristics of the fuselage? And so on and so forth.
I know this is not what you wanted to hear, but your question can't be answered simply. If you really want a triangular shaped fuselage, you have thought it through and can arrange to have a thorough structural analysis done, I'd say go for it.
Jay
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paulrod36(at)msn.com
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| Posted: Mon Apr 18, 2011 5:21 pm Post subject: A couple of questions |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Many thanks to Craig, Randy and Jay for the quick turnaround on my questions. Since I'm built pretty much like anybody else, the cockpit would "violate" the pyramidal esthetics, but it was more of a mental exercise in design than something to make another project out of. Maybe someday, just for fun, though.
Paul R
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