On Monday I hit something just under the water, (maybe a big crab???) with my favourite 20cm cedar/carbon/stainless weedy. Unfortunately the stainless is only at the tip end, whatever it was penetrated deep into the cedar, delaminating the carbon on 1 side. Couldn't sail with it flapping so tore it off and sailed the ~1.5km home with care. On Tuesday, coming out of my last gybe hit a rock, with my 23cm tuttle weedy. Sailed the ~1km back before turning the board over to see the damage, quite surprised me as it didn't feel too bad, perhaps I don't need the tip on this fin???
