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Oyster 675 Keel and centerboard is a Offshore deck saloon cruising sailboat built by Oyster and designed by Humphreys Yacht Design. Her first hull was built in 2014 with an overall lengh of 21.07 m or 69.1 ft long and a Deck stepped mast mast configuration.

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OYSTER 675 KEEL AND CENTERBOARD Sailboat Specifications​


Overall Length (LOA) m / ft21.07 m / 69.1 ft
Builder(s)Oyster Marine Ltd.
Designer(s)Humphreys Yacht Design
VersionKeel and centerboard
categoryOffshore deck saloon cruising sailboat
CountryUnited Kingdom
Hull TypeMonohull
First Hull Built2014
Last Hull BuiltStill in production
AppendagesCenterboard pivoting centerboard in the keel
HelmTwin helm wheels
RudderTwin spade rudders
CockpitCenter cockpit
Rigging TypeSloop Marconi 9/10
Mast LayoutDeck stepped mast
Freshwater Tank Capacity lt/gal1550 L / 409.5 gal


Overall Length (LOA) 21.07 m / 69.1 ft
Hull Length19.89 m / 65.4 ft
Waterline Length (LWL)18.16 m / 59.7 ft
Beam (width)5.65 m / 18.6 ft
Draft4.48 m / 14.8 ft
Light Displacement (MLC) 42560 kg / 93829 lb
Maximum Displacement37499 kg / 82672 lb


Critical Hull Speed10.34 knots
Capsize Screening Formula (CSF)1.71
Comfort Ratio41.91
Displacement-Length Ratio (DLR)201
Sail Area to Displacement20.87
Upwind Sail Area to Displacement18.79 m²/T / 202 ft²/T

Above Deck

Mast LayoutDeck stepped mast
Mast Height from DWL30.75 m / 100.11 ft
Rotating SparsNo
Number of Levels of Spreaders3
Spreaders AngleSwept-back
Spars ConstructionAluminum spars
Reported Sail Area228.91 m² / 2464.00 ft²
Upwind Sail Area229 m² / 2465 ft²

Engine Room

Engine(s)1 inboard engine
Engine(s) Power180 HP
Fuel typeDiesel
Fuel Tank Capacity1900 L / 501.9 gal