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I have heard that iflight's Green Hornet uses T700 carbon instead of 3k carbon. What difference does the new T700 carbon make?

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First of all, the 300 or 700 is the grade value of carbon fiber and generally, a higher grade means more strength and better performance. The main differences between T300 (3k) carbon and T700 carbon are that T700 carbon has almost 40% more tensile strength than 3k carbon, T700 carbon is slightly denser (and thus heavier for the same volume of carbon), T700 carbon fiber has a higher carbon content and a lower nitrogen content, and T700 carbon fiber is smoother looking while T300 carbon looks more bark-like.

So, overall, T700 carbon is better for making a drone frame because it is significantly stronger with only a small increase in weight.

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T700 and 3K are different indication. T700 indicate the strength of the frame (higher strength/weight ratio) 3k usually means the number filaments on the surface layer. You can have a carbon fiber sheet T700 3K

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