Cracks in Yacht....Are they serious?

it can if the hull cradle is not supporting the hull and you run over a few bumps, that would make the hull flex up and down around the keel. i still think your best option is a local glass boat workshop.

 

Thats a very good point !!! the whole weight of the boat is pushing the keel up inside the boat and if it was being towed and hit a hard bump at some time could be part of the problem . certinly while not be helping thats for sure !!
The hull needs to carry the weight but the keel need to be wedged as well to take a bit of the weight !

 

If you not into glass repairs yes find a glass shop BUT befoe you get some one involved open it up yourself and find out whats there !! is the floor timbers broken and could even be rotten maybe (just guessing ) the glassing is not that difficult just some basic principles to stick to . but that a ways to go yet! Its possible to make the floor timbers from solid wood with plywood cheeks and couple it with a combination of some good glass and will be a really good job !!

 

I do agree with Tunnels. It's structural as the floors are breaking and the keel is breaking also its support with the hull. Happily it's not a difficult job, and a good repair can be done. Old light polyester boats have tendency to become soft and need reinforcements. Similar problems are often found on boats like the 420 and 470. Polyester is heavy so these boats are built very lightly to keep the weight down and after a few years cracks appear in all the stressed parts.
Better sand outside also minimum 6 inches wide around the keel and look for cracks in the hull. A fix outside and inside will resolve the problem.
With epoxy resin (that glues truly...and seals the porosities in same time) this job will be pretty easy with less material than with polyester.

 

To strengthen up the bboat in that area is make sure the hull is carying the weigh and the keel is hanging free make new floors inside the hull but makw then bigger and do some better glassing inside using unidirectionall glass to spread out the loading better under the floors befor the new ones are fitted and also over the top of the floors to spread and distribute th loads better . the unidirectionall glass will do wonders for spreading the loads and easing the local bending just in places . Its looks like a older boat anyway so give it a new lease of life and not have to worry about it again !!.

 

Yes, the boat probably needs work, but those are really interesting faces on your garage wall. What's the story on those?

-jim lee