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Sailboat specifications and datasheets

Oyster SJ43 fractionnal rigging

The Oyster SJ43, here in "fractionnal rigging" version, is a 43’5” monohull sailboat designed by Stephen Jones. She was built by Oyster (United Kingdom) and made of GRP (glass reinforced polyester). This sailboat was produced between 1981 and 1985 with about 10 hulls completed.

The Oyster SJ43 belongs to the Two Tonner class. The Oyster SJ43 is as well listed, on Boat-Specs.com, in version Mast head rigging.

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Oyster SJ43's   Main Features
Model Oyster SJ43
Version Fractionnal rigging
Type of hull Monohull
Category Offshore cruiser-racer sailboat
Shipyard
Designer Stephen Jones
Class Two Tonner
Construction GRP (glass reinforced polyester)
First built hull 1981
Last built hull 1985
Number of hulls built About 10
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 spade rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Oyster SJ43's   Main dimensions
Hull length 43’ 5”
Waterline length 34’
Beam (width) 14’ 1”
Draft 7’ 5”
Light displacement 18453 lbs
Ballast weight 8311 lbs
Ballast type Lead
Oyster SJ43's   Rig and sails
Upwind sail area 829 sq.ft
Rigging type Sloop Marconi 3/4
Rotating spars No
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle 0 °
Oyster SJ43'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.
18.68
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.
213
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.
45 %
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.
7.81 knots
Oyster SJ43's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Fuel type Diesel
Oyster SJ43's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 6 / 10
Head(s) 2

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