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MrCranky said..Foghorn said..
From my experience a catapult is the only way to break a carbon boom
I've catapulted against my X9 too many times to count.
I feel your pain

, @ 110+kg + lead + speedballsofsteel

, done similar/same hitting sandbars at 36knots, or heinous hi 30-40's spin-outs to rail bites with rag doll double over boom wraps. The harness line thankfully broke on numerous occasions or the body broke instead when it went up against this particular boom, W' X9. This boom has broken records and ribs but still ain't broke yet, it is a worthy contender for the 'Wishbone Hall of Fame'.
Other ways to break booms...
- accidentally leave the tail-end telescopic adjusting clip unfixed on one side. The opposite side(fixed) can fail excessively flex whilst you hang/harness off it under great sail load etc as it is not braced by the other side that is free to compress. This was with an SL X9 btw, my fault of course. If you do break one side take it easy sailing in on the other as it will likely break without the opposite sides support if you load it up.
- just like mast's, treat them bad, drop/knock em hard n quick etc on hard point load surfaces like stones rocks etc, is not generally good for them or most things carbon.