The diagram is confusing one part says that the total radius is one inch then it say the shaded area is one inch radius that means the shaded area is two inches across yet the total which is supposed to be a one inch radius is clearly much wider then the shaded area so the total radius has to be more then a one inch radius. all this because it has to have a thickness rule. So on the smaller boats to get the thickness you will end up with what looks like tongue with a big ugly wart on the end of it.

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