Re: 100 lb of Lead Vs 100 lb of concrete
It's all about volume versus weight under water. However; as ballast in a boat, 100# is 100# if it can be put in the same space, such as an enclosed keel. That isn't normally the case, because concrete takes up more space that lead, thus it usually cannot be placed as low down. Lead keeled boats often can carry more sail and point better than boats with concrete as ballast. However; boats with concrete ballast can have an easier motion than lead ballast boats. My old Cheoy Lee 31 has a very nice, easy motion. I never felt seasick, even in rough weather. I've been on other similar sixed sailboats with lead ballast, and was queasy when it got choppy.
Privateer 26 Schooner