The outer arms are aluminum the inner piece is magnesium.
Actually I looked at the mililtary spec book and the stiffness to weight of aluminum alloys and magnesium alloys are pretty close.
Magnesium is just lighter in general so you can get a lighter, slightly larger, structure that will overall be stiffer. But that's more geometry driven.
On the back of a Demo for that one link, I'll give you $100 if you could tell a difference.
*Although strength wise magnesium is slightly weaker that 6061 (39 ksi vs 42 ksi) so it really would only be beneficial in areas where you are just trying to save weight as the strength to weight is better but the stiffness to weight is on par with aluminum.
Not that it makes a difference, but Mag is almost always used in structural applications as an alloy. So they could write alloy on it and it would still be correct.
Not that it makes a difference, but Mag is almost always used in structural applications as an alloy. So they could write alloy on it and it would still be correct.
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