Carbon fibre, like most composites, is also very hard to predict. It's much more complex to model, especially in terms of how it ages, and there's a lot of oppo

Carbon fibre, like most composites, is also very hard to predict. It's much more complex to model, especially in terms of how it ages, and there's a lot of opportunity for part-to-patt variability, so even extensive testing doesn't necessarily give you an all-clear. It took a lot fo time and money to get carbon fibre to the same level of understanding as metals for use in airlines.