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please answer my question and if you don't know I know there is no difference .

what is the difference in 1/5 model ?I think there is no difference aspect engine it can fly over 1 mach with a powerful engine.

use carbon instead of titanium

just need a high tech engine thickness doesn't matter but perhaps they will use General Electric TF34 a weak engine for this design .

Thickness make more stability in low speed no problem if you have strong engine or in light small planes .