Pelican is a 40yr old carvel workboat originally open, now half cabin with roof over aft deck; Length 22feet, Beam 8 feet, round bilge, built on keelson. Displaces about 3 ton.
She is uncomfortable at anchor and rolls savagely in any sort of beam sea. I added a bloody great length of railway line to the keel (approx 500kg) for little effect (made things worse) and I am wondering what to do next. Would bilge keels be better than ballast? My old fisherman friend tells me the bilge keels will act more slowly and gently than the extra weight.
I understand we need to increase the roll "moment of inertia", can anybody suggest what criteria to apply? I prefer to work on the KISS principle.