Abstract: The invention provides an improvement in a keel arrangement for a sailboat hull, of the kind having an elongated ballast member spaced below the hull so as normally to extend horizontally and fore-and-aft under the hull, and a front foil and a rear foil depending respectively from a front and a rear portion of the hull, the lower ends of which between them support the ballast member, and in which the rear foil is pivotable about a vertical axis to allow it to act as a rudder. The improvement comprises a joint connecting a main, front portion of the ballast member to a minor, rear portion thereof, the joint allowing both longitudinal and rotational movement between the ballast member portions, whereby the foils can bend independently of each other, and the large majority of drag forces on the ballast member are resisted only by the front foil.