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Originally Posted by Serum
what makes you say that aluminium and titanium weight/strength factor is about the same?
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They are pretty similar. Aluminium is about half the weight of titanium, and 7000 series aluminium alloys are pretty strong. Titanium is better for skids (as you said), its much much harder and can absorb impacts. Aluminium is better for structural parts (bulkheads) as its much lighter.