Sailboat specifications and datasheets

Oyster 55

The Oyster 55 is a 56’4” monohull sailboat designed by Kim Holman and Donald Pye. She was built by Oyster (United Kingdom) and made of GRP (glass reinforced polyester). The production started in 1986 with 49 hulls completed.
Oyster 55 Oyster 55 sailingOyster 55 sailingOyster 55 cockpitOyster 55 accommodationsOyster 55 accommodationsOyster 55 accommodationsOyster 55 accommodationsOyster 55 accommodations
Oyster 55's   Main Features
Model Oyster 55
Type of hull Monohull
Category Offshore cruising sailboat
Designer Kim Holman
Donald Pye
Construction GRP (glass reinforced polyester)
First built hull 1986
Last built hull Discontinued
Number of hulls built 49
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 rudder on skeg
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Oyster 55's   Main dimensions
Hull length 56’ 4”
Waterline length 45’ 5”
Beam (width) 15’ 8”
Draft 7’ 6”
Light displacement 50993 lbs
Ballast weight 13228 lbs
Oyster 55's   Rig and sails
Upwind sail area 1595 sq.ft
Rigging type Cutter Marconi (in-mast furling mainsail) masthead
Rotating spars No
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle 0 °
Oyster 55's   Performances
Upwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.
The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat.
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
26 %
Hull speediAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
9.03 knots
Oyster 55's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 84 HP
Fuel tank capacity 158.5 gal
Oyster 55's   Accommodation
Cabin(s) 4
Berth(s) 8
Head(s) 2
Fresh water tank capacity 290.6 gal

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