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Sailboat specifications and datasheets

Sealord 39 ketch

The Sealord 39, here in "ketch" version, is a 38’6” monohull sailboat designed by Edward Dubois. She was built by Westerly (United Kingdom) and made of GRP (glass reinforced polyester). This sailboat was produced between 1983 and 1987 with 42 hulls completed.

The Sealord 39 is as well listed, on Boat-Specs.com, in version Sloop.

Westerly  Sealord 39 Westerly  Sealord 39 sailplan
Sealord 39's   Main Features
Model Sealord 39
Version Ketch
Type of hull Monohull
Category Offshore cruising sailboat
Shipyard
Designer Edward Dubois
Construction GRP (glass reinforced polyester)
First built hull 1983
Last built hull 1987
Number of hulls built 42
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 spade rudder
Cockpit Central cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Sealord 39's   Main dimensions
Hull length 38’ 6”
Waterline length 32’ 6”
Beam (width) 13’ 2”
Draft 5’ 6”
Mast height from DWL 48’ 4”
Light displacement 18501 lbs
Ballast weight 8001 lbs
Sealord 39's   Rig and sails
Upwind sail area 974 sq.ft
Downwind sail area 1793 sq.ft
Mainsail area 274 sq.ft
Mizzen sail area 108 sq.ft
Genoa area 592 sq.ft
Solent area 325 sq.ft
Jib area 217 sq.ft
Stormjib area 125 sq.ft
Symetric spinnaker area 1411 sq.ft
Gennaker area 1019 sq.ft
Rigging type Ketch Marconi masthead
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle 0 °
Sealord 39'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.
21.91
Downwind 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.
40.33
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.
245
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.
43 %
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.
7.64 knots
Sealord 39's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Fuel type Diesel
Fuel tank capacity 53.4 gal
Sealord 39's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 6 / 8
Head(s) 2
Fresh water tank capacity 130.8 gal

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