Twin store carriers were a day to day fit for Harriers. Indeed 4 bare twin store carriers was one of the worst handling high alph high mach configurations. As a result when we went to the US for a first look at the new plastic wing on the YAV-8B the UK considered the benchmark for showing impovement at high speed was bare carriers. When it came to VSTOL the big issue was rolling moment with sideslip when partially jet borne. The new wing was better at both.