Bilge Keel vs Twin Keel

Richard A. Miller

Twin Keel Type: Has no center keel. Ballast is carried within prominent twin keels. May have either single or twin rudders.

Bilge Keel Type: Has a center keel that carries most of the ballast. Bilge keels long and shoal. Single rudder. 

The Willard hull necessarily is a bilge keel type installation.