9 tonnes is the (theoretical) ultimate breaking load, I assume.
In aerospace laminates designed for a decent fatigue life strain is kept below 0.3%. (from old literature but still)
What do you have at 9/2 tonnes?
/Martin
Nice!
When we built our boats we were so eager to go sailing we decided proper long boarding and all that jazz could wait. 25 years later it has still not happened
/Martin (-9 C so no sailing in a while)