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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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RW- the further away from twist center, then the higher the stress. (and the stress rises exponetially with dia.) That's why hollowing is done . .. the metal in the center is contributing little. But, as the hole gets bigger, the amount of "spring" taken away also grow (exponetially) . Of course, what has been taken away from the center can be added back to the outter most diameter in smaller amounts, and have the same net stiffness.
as far as metals go, unless someone is making the t-bar out of so-called 'liquid metal' I doubt that the choice of metal is something "new and improved."
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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