Twin keel

This configuration is especially useful for sailors in Britain and might in the future be applied in the parts of the Atlantic North America that are extremely tidal such as the Fundy waters that are shared by Maine, New Brunswick, and Nova Scotia.

Twin keels are meant to make sailing safer and easier in shallow or extremely tidal waters while preserving the stability and performance of deep-keel vessels.

The first twin-keeled sailing vessel is widely believed to be the Bluebird [2] that was built by Lord Riverdale and launched in 1924.

Despite being the first twin-keeled yacht, and being built without much in the way of guiding engineering and science, it was quite radical as it had twin rudders (as racers have today), and a long narrow hull with a pointed, or "canoe," stern.

The first was a step backwards in that it re-introduced a normal keel as a place for ballast and to collect bilgewater.

Her ocean handling was considered to be safer than similar single-keeled craft as she rolls less, and is hence less likely to broach going downwind.

There is a 250 kg bulb, or weight, at the end of each keel that is shaped such that it remains hydrodynamic when lifted.