betoonkeel

Betoonkeel is an Estonian term that translates to "concrete keel" in English. It refers to a structural element in some sailing vessels, particularly older or traditional designs, that serves a purpose similar to a traditional ballast keel. Instead of a heavy lead or iron casting bolted to the hull, a betoonkeel is constructed from reinforced concrete, often molded directly into the hull or as a separate unit attached during construction.

The primary function of a betoonkeel is to provide stability to the sailboat. By lowering the center of gravity, it counteracts the heeling forces generated by the wind on the sails, preventing the boat from capsizing. This stability is crucial for safe sailing and for the boat's ability to sail upwind effectively.

Betoonkeels are known for their durability and resistance to corrosion, advantages over some metal keels. They can also be less expensive to manufacture than lead or iron keels. However, they are considerably heavier and less dense, meaning a betoonkeel will be bulkier than a metal keel of equivalent weight. This can affect the boat's overall hydrodynamic performance, potentially leading to slower speeds. The construction method also means that the keel is an integral part of the hull, making repairs or modifications more complex. While less common in modern high-performance yachts, betoonkeels can still be found on various types of cruising and traditional sailing vessels.