the wing keel of the 270 is lead appx. 2000 pounds made by Mars Metals in Canada. The molds for the hulls are the same but different molds as the 270 did not have the swing centerboard housing as the 260. The floor pan if I recall was lowered as the water ballast is not the case plus there is no center board housing area to contend with. As a result, the table could be lowered all the way down.