RE: Roger, should I go for carbon?
Thanks for your help, I will take a look at that second-hand Fiberspar then.
About broken AL booms of local racers - I know about two G and one P - breakage in the clamp (the had the same) and two broken Ch - tubes just after the clamp (one even reinforced from the front - broken just after reinforcement, probably bad batch - next year was OK).
I beleive they knock them loose while pumping and then stress-load in high winds.
There is a limitation to 60% carbon for the masts in their racing class - that could also produce more stress on the boom in gusty or choppy conditions with large sail I guess.