I just finished reading Roger Taylor's books about his boat Mingming II (not a Westsail), which he's done some impressive arctic sailing in. He mentions that Mingming II is packed with enough foam to make it unsinkable, and I immediately wondered how much foam would it take to make a W32 unsinkable?

Back of napkin calculation: 20K lbs boat / 62 lbs per cubic foot of water = 322 cubic feet of foam, which I further calculate to be a cube approximately 7'x7'x7'.

Anyone care to critique my calculation?