The Oyster SJ43
is a 43’5” (13.22m) cruiser-racer sailboat designed by Stephen Jones Yacht Design
(United Kingdom). She was built between 1981 and 1985 by Oyster
(United Kingdom). The Fractional rigging
version features 3/4 rig allowing finer sail trimming options and lower IOR rating.
The Oyster SJ43
is as well listed, on Boat-Specs.com, in Mast head rigging
version (see all the versions compared
Oyster SJ43's main features
Offshore cruiser-racer sailboat
Hull and deck: GRP (glass reinforced polyester)
Number of hulls built
First built hull
Last built hull
Keel : fin without bulb
Single helm wheel
Single spade rudder
Standard public price ex. VAT (indicative only)
Oyster SJ43's main dimensions
43’ 5”13.22 m
14’ 1”4.29 m
7’ 5”2.25 m
Light displacement (MLC)
18453 lb8370 kg
8311 lb3770 kg
Oyster SJ43's rig and sails
Upwind sail area
829 ft²77 m²
Sloop Marconi 3/4
Number of levels of spreaders
1x19 strand wire
Oyster SJ43's performances
Upwind sail area to displacement iThe 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 25 it indicates a fast sailboat.
201 ft²/T18.68 m²/T
Displacement-length ratio (DLR) iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The 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 ratio iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.
The higher the ballast ratio is, the greater is the stability.
Critical hull speed iAs 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.
Oyster SJ43's auxiliary engine
1 inboard engine
Oyster SJ43's accommodations and layout
Closed aft cockpit
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