New old guy
Posted: Wed Mar 01, 2017 8:12 pm
Hello to all. New to the forum. Recently retired welder. Preparing to build first boat. This is a purpose built tour boat designed to operate in shallow water. Here on the coast of N.C. shallow means one to four feet at low tide. As a Wildlife/birdwatching boat, getting close to shore is important. Let me describe the boat and perhaps you can help me with some material advise.
Picture two, Five ft wide, Four ft high, forty ft long sponsons,[.250 plate] which come to a point at the bow with a square stern and a flat bottom. These two will be connected together, four ft. apart with trusses which will be two ft. x four ft. Truss material is 2x2x.250 wall square tubing 5086 or 5083. Trusses will be on 2 ft. centers unless advised otherwise. Hull material will be double plated the length of the truss attachment points. This will be decked with .125 sheet and about half will be enclosed and heated/cooled. Need advise about stringers and ribs. Size and placement inside the sponsons. My idea is .125 material 4 inches wide on 2 ft. centers running across the bottom and up the sides for ribs. Same size for the stringers, 10 inches off the center line, both sides of the C/L.
This will be a boat which spends most of its time in flat water with a little chop on the sounds. Never offshore. Having said that, it needs to be strong enough to handle 2 to 4ft. seas which can occur on the sounds. Just in case.
Power will likely be a pair of jet outboards 50-90 hp mounted on cantilevered transoms.
Regards to all, Alan Waters
Picture two, Five ft wide, Four ft high, forty ft long sponsons,[.250 plate] which come to a point at the bow with a square stern and a flat bottom. These two will be connected together, four ft. apart with trusses which will be two ft. x four ft. Truss material is 2x2x.250 wall square tubing 5086 or 5083. Trusses will be on 2 ft. centers unless advised otherwise. Hull material will be double plated the length of the truss attachment points. This will be decked with .125 sheet and about half will be enclosed and heated/cooled. Need advise about stringers and ribs. Size and placement inside the sponsons. My idea is .125 material 4 inches wide on 2 ft. centers running across the bottom and up the sides for ribs. Same size for the stringers, 10 inches off the center line, both sides of the C/L.
This will be a boat which spends most of its time in flat water with a little chop on the sounds. Never offshore. Having said that, it needs to be strong enough to handle 2 to 4ft. seas which can occur on the sounds. Just in case.
Power will likely be a pair of jet outboards 50-90 hp mounted on cantilevered transoms.
Regards to all, Alan Waters