I read a story in a Swedish boating magazine about a near disaster with GRP
hull.
It was a smaller open powered displacement boat. I think the english term i
double ender ?
Anyways, going through quite thin ice the boat started to take in water.
Turned out the ice had
cut holes on both sides of the bow. I guess the bow itself vas to thick.
Some rags reduced the
flow and he could reverse to shore!

/Lars J