How much do you think your carbon boom is flexing under load while windsurfing in real life ?
Check this video out to discover how the tail of a NP X9 boom is bending under load :
http://www.youtube.com/watch?NR=1&v=0y87AgBBxMo
Quite impressive indeed..., especially considering that the sail is quite small (i.e., Overdrive 7.0 m2) with a boom lenght < 2 m long.
Other boom's tails look like stiffer than other, especially one with white/black/red stripes...:
http://www.youtube.com/watch?NR=1&v=zakHJEje9OQ
Cheers !
JM