By Matt Claiborne
01.
Traditional offshore sailboats began with full deep keel designs. Shallow draft near-shore workboats often feature flat-bottomed variations that use centerboards, leeboards, or other means to fight leeway and work upwind.
02.
The first progression toward modern keels was the encapsulated deep fin keel. This was a natural progression as designers began working out ways to shrink a full keel down.
01.
02.
Wing and bulb keels can get tangled in things
Flat on the bottom, more challenging to get off than conventional fins
01.
Bilge keel or twin keel sailboat
02.
Retractable swing keel