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Ted Edwards
 
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sniffer wrote:

According to that program, steel weighs 3 times more than aluminium. My


That's about right.

question is, how much stronger will steel tubing be than aluminium, if the
steel tubing is 1/3 of the wall thickness of aluminium tubing?


Strength depends on the alloys being considered. There are aluminum
alloys up to about 75Ksi tensile and steels up to about 250Ksi but
whether they are practical in a given situation ...

However if you can come up with a strong enough design, the deflection
would be about the same. Steel has 3 times the weight and 3 times the
elastic modulus.

Ted