And it would probably interest OP to know that it's not just basic strength-versus-mass where carbon shines. With metallics, you have that strength in every dir

And it would probably interest OP to know that it's not just basic strength-versus-mass where carbon shines. With metallics, you have that strength in every direction. But most parts only need to be strong in a limited number of directions. With carbon, you can tailor the part to provide strength only in the directions needed, which means you're using less material. More weight savings on top of what you already gained* by switching to carbon in the first place. [*] It ain't all sunshine and roses. Sometimes it just doesn't work out. Substantial strength reductions due to heat and moisture absorption are real. Other factors exist that'll ruin your weight savings too. A former boss of mine designed a carbon nacelle inlet lip for a popular airliner, but it was a short haul aircraft, which means lots of trips, which means lots of abuse from careless ground handlers. After accounting for that, it weighed as much as his reference aluminum design. The nacelle went into production with aluminum inlet lips.