On 4/11/01 10:15 PM, Eric Rosenberg at wd3q@erols.com wrote:
>1. The results of I get from using the MARC software package tells me I
>can use a 2" OD pipe and/or tubing with a wall thickness of .120...and
>then lists a variety of mast material. Does the yield strength (listed
>as 35000 for 6061-T6) change if the mast wall thickness is greater than
>.120, say .250?
I understood that the yeild strength is a fundamental property of the
material. Making it thicker doesn't increase the yeild strength, although
it does give more area for the forces to work themselves out in. (ie a
thicker mast is stronger, but the yeild of the material doesn't change)
>2. One material mentioned is 7075-T6. Where is that material available
>and at what price? The 'local' distributor, Dillsburg Aeroplane Works,
>doesn't carry it.
7075 is an alloy commonly used in aerospace applications. I think
Aircraft Spruce carries it.
Frankly, if you are trying to judge between 7075 and 6061, I'd go with
6061. 7075 isn't much stronger, and it can be really expensive. 6061 is
pretty common. If 6061 doesn't have enough strength, just bite the bullet
and go with 4130 chrome-moly steel. 4130 is much stronger than any kind
of aluminum you can find, with yeild strengths to 90,000 psi and beyond.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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