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Sailboat specifications and datasheets

Oyster SJ41 mast head rigging

The Oyster SJ41, here in "mast head rigging" version, is a 39’8” 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 1980 and 1987 with 23 hulls completed.

The Oyster SJ41 belongs to the One Tonner class. The Oyster SJ41 is as well listed, on Boat-Specs.com, in version Fractionnal rigging.

Oyster SJ41 Oyster SJ41 sailingOyster SJ41 sailingOyster SJ41 sailing
Oyster SJ41's   Main Features
Model Oyster SJ41
Version Mast head rigging
Type of hull Monohull
Category Offshore cruiser-racer sailboat
Shipyard
Designer Stephen Jones
Class One Tonner
Construction GRP (glass reinforced polyester)
First built hull 1980
Last built hull 1987
Number of hulls built 23
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 SJ41's   Main dimensions
Hull length 39’ 8”
Waterline length 33’ 7”
Beam (width) 13’ 7”
Draft 6’ 11”
Light displacement 17086 lbs
Ballast weight 7716 lbs
Ballast type Lead
Oyster SJ41's   Rig and sails
Upwind sail area 648 sq.ft
Rigging type Sloop Marconi 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 SJ41'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.
15.37
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.
204
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.
7.77 knots
Oyster SJ41's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Fuel type Diesel
Fuel tank capacity 13.2 gal
Oyster SJ41's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 6 / 8
Head(s) 1
Fresh water tank capacity 46.2 gal
Maximum headroom 6’ 1”

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