about 70% of the fibres are in the 0 deg direction. the off axis fibres are there to hold the 0s in column and stop them from bursting when the mast flexes.
the first carbon mast i built for my boat had 2 plys of 200 gram fibre glass cloth at 0/90, 4 plys of 300 gram standard modulas carbon uni at 0 and one ply of 500 gram fibre glass at 45/45. it failed after six years of use. snapped just below the hound. we put it back together in two days and finished the season with it.
the new section i am building is out of 200 gram t 700 high modulas carbon, one ply at +/- 60 degrees, 5 plys at 0 and one ply at 90 degrees. we are adding a web in the centre built out of 1 ply at 0, 3 plys at 90 and one ply at o.
the first tube was 65 pounds and all wet laminate. i am hopping the pre preg mast will be about a pound a foot for its 35 foot height.