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How realistic are Mass-Strength Ratios >1?

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So iv'e had this question for a while but only recently have really been working with planes enough for it to really nag me; when you're using procedural wings there's a slider to increase "Mass-Strength Ratio" which i tend to set at 2 to prevent hypersonic shock from tearing them into pieces.

But it's had me wondering; how realistic is this? Are there materials that exist now with such ratios?  Are there any in common use with higher ratios? Are they metallic or composite?

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Very realistic. Just stepping up from aircraft aluminum alloys to titanium alloys easily gets you a factor of 2 to 3 in the ratio.

And you can get another factor of 10 by going to composites.


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