Design #64 - 1 Ton IOR Lift Keel Racing Sloop

considerable ballast in them), which not only took advantage of a rating loophole to reduce rating, thus allowing more length of hull, but also gave very efficient upwind performance in all conditions.

Because the Rule discouraged weight in centerboards, stability was largely dependent on internal ballast which required slightly higher displacement to obtain a higher ballast ratio, but this in turn allowed more sail area to give improved light weather performance.

In their day these boats were virtually unbeatable, and represented a major advance in yacht design for ocean racing.