Okay class lets run some numbers.
one you are looking at 1006 lbs of engine
. That doesn't include the weight of the transmission
, shaft, and propeller
. So lets add another 500 lbs for that. Okay round to 1500 lbs of steel
Now that is a good start. Hidden below deck
level there are 3 anchors one really nice long chain, and a short length of chain. Combined weight of this is about 750 lbs of steel
. Subtotal = 2250 lbs
we have 8 winches with an average weight of about 30 lbs. Okay round up to 250 lbs. Subtotal = 2500 lbs
Forgot to add the watermaker
, pumps, fridge, power tools, hand tools, and electrical equipment
, and electric
wire. Would you accept 1500 lbs? Subtotal 4000 lbs.
All this stuff will have a density of about 500 lbs/ft3. Therefore, we have about 8 ft3 of steel. Saltwater has a density of 62 lbs/ft3. Therefore, we need to positive buoyancy of 3500 lbs to offset all this heavy stuff.
Next lets go top side and look at that mast
. It is about 700 lbs, of aluminum
and about 160 lbs/ft3. To off set this mast
we need only 425 lbs of positive buoyancy.
Subtotal rounded up is 4000 lbs of net positive buoyancy keeps my sailboat floating.
Almost everything else either floats or as a density not to far different from seawater.
However since life is on the line...lets double the number 4000 lbs, and demand that we identify at least 8000 lbs of net positive buoyancy. This will account also for other items like glass, fiberglass
, cans, and those shells picked up along the way.
To put this in prospective, 8,000 lbs is the weight 4 Volkswagen Beetles. So think of a platform sitting in the water and all 4 cars have dry wheels.
While we are at it, lets start assuming some really bad news.
There isn't a single
compartment that still holds air. Wow, lets assume that both of the ama are gone and the 6 different aka that connect to the ama are also gone. This is really bad news since there is almost nothing in the ama or aka that sinks. All that net positive buoyancy is lost
because we are looking at worst worst case.
Will the mainhull alone still float?
Lets begin with the walls. 65 feet by an average of 25 feet from top side around the bottom and back up the top side, and 1 inch thick means there is about 135 ft3 of balsa wood. At only about 10 lbs/ft3 this balsa wood will provide a net buoyancy of 7000 lbs.
Up on deck we are looking at combination foam core
. Total cubic feet of decking on mainhull alone is 65ft *10ft *1.25 inches = 68 ft3. That has some plywood
in it so lets call that density 22 lbs/ft3 and weight of 1500 lbs. The net buoyancy of the deck is 2700 lbs. Subtotal 9700 lbs.
Now lets go inside and start adding up the flooring
that floats, the 8 inches of foam insulation
around the refrigerator
and we have at least another 2700 lbs of net buoyancy. Subtotal 12,400 lbs.
Worst case assumption of stuff that sinks = 8,000 lbs negative buoyancy
Worst case minimum of stuff that floats = 12,400 lbs positive buoyancy
In my case, my trimaran
minus both ama and aka will still remain afloat with a net positive buoyancy of at least 4,400 lbs. Heck bring on the super-sized land lubbers and lets have a party! At least 10 of them should still be high and dry.
HOT BuOYS Trimaran