Re: Gelcoat cracks in Sabre
Those cracks certainly appear to be caused by the point-loading of the genoa track, particularly at the bolts. Is it possible to get access to the underside, and can you see what backing plate/washer/etc arrangement was used?
Also, are the cracks concentrated in specific locations, for example, a cluster around the "150%" genoa car position and the "100%" car position? If so that would pretty much indicate inadequate below decks reinforcement in those highly loaded areas. Improving the backing in those regions would go a long way towards stabilizing the current situation. If the loading/flexing continues over time I think it's reasonable to expect the cracks to perhaps worsen with use. It may still be primarily a cosmetic issue, but eventually the visible portion of cosmetic damage becomes a 'costly' item during survey and resale...
Also, if there is significant movement causing these stress cracks, any cosmetic repairs may well reopen unless the backing is addressed.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"