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@gbj_tester
Ed, on this one occasion perhaps you should perhaps have kept quiet. Anybody who suggests that one kind of aluminium alloy is stiffer than another needs solid documentary evidence for their claim, which will amount to no more than 5% difference anyway, or they risk showing that they actually don't have a clue about metallurgy.
It seems improbable that you are clueless, so perhaps you will enlighten me about the alloys you were comparing when you said the Sc one was lighter, stiffer and stronger.