yesterday, I was coming back to shore after a fine sailing session and I had a bit of upwind sailing to do before getting to shore.



As always, it is not the greatest aim for a boardless catamaran but it was moving fairly fine until I noticeds that my main was sheeted block to block. I seem to remember that I was never able to sheet block to block because of my moderate mast rake so I was wondering:



Is it possible that my hulls are getting softer and giving in to the center in front of the front beam?



My boat is a very old (1984) Nacra 5.7 with the fiberglass hulls (no core). Some spider cracks are there in many places on the boat but I never noticed before that the hulls were soft.



Are there any tests or checks that I could do to see if the hulls are getting soft?



Is it possible to repair and strenghten them?



Could I swapp the hulls (port to starboard), I would only have to change the aluminium trampoline rail and the jib rail.



I was planning to perform some work on the hulls this winter like removing the decks and applying some fiberglass on them. Also I should do a keel job and a rudder job.



Next time I drive down to my lake, I will bring a flashlight and inspect the interior structure of the hull to try to detect anything wrong with them.



I am welcome to any suggestion



Please be especially nice if you plan to tell me that my hulls are dead because I really cannot afford any bad news about my cat.