Not that cost doesn't go up with length generally, but I would argue that displacement is a better proxy for cost than length. Sail size is selected to compliment the displacement, and the size, number and complexity of installed systems also varies more with displacement than leingth. Sail area not boat length then determines the size of the deck hardware, the loads on the running rigging, size of the fittings, ect.
As an example my Olson 30 used a 4.5hp outboard and was really more than it needed. While a J-30 uses a 15hp diesel and is a little underpowered. The difference isn't length, but that the Olson weighs 3600lbs while the J weighs 6500lbs.
As an example my Olson 30 used a 4.5hp outboard and was really more than it needed. While a J-30 uses a 15hp diesel and is a little underpowered. The difference isn't length, but that the Olson weighs 3600lbs while the J weighs 6500lbs.
