Detailed sailboat specifications and datasheets since 2015
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Sealord 39 (Sloop) vs Sealord 39 (Ketch)

Main featuresSealord 39 SloopSealord 39 Ketch
Model
Sealord 39
Sealord 39
Version
Sloop
Ketch
Hull type
Monohull
Monohull
Category
Offshore cruising sailboat
Offshore cruising sailboat
Sailboat builder
Westerly
Westerly
Sailboat designer
Country
United Kingdom
United Kingdom
Construction
Hull and deck: GRP (glass reinforced polyester)
Hull and deck: GRP (glass reinforced polyester)
Number of hulls built
42
42
First built hull
1983
1983
Last built hull
1987
1987
Appendages
Keel : fin without bulb
Keel : fin without bulb
Helm
Single helm wheel
Single helm wheel
Rudder
Single spade rudder
Single spade rudder
Unsinkable
No
No
Trailerable
No
No
 
Main dimensionsSealord 39 SloopSealord 39 Ketch
Hull length
38’ 6”11.73 m
38’ 6”11.73 m
Waterline length
32’ 6”9.9 m
32’ 6”9.9 m
Beam (width)
13’ 2”4.01 m
13’ 2”4.01 m
Draft
5’ 6”1.68 m
5’ 6”1.68 m
Mast height from DWL
50’ 4”15.32 m
48’ 4”14.72 m
Light displacement (MLC)
18501 lb8392 kg
18501 lb8392 kg
Ballast weight
8001 lb3629 kg
8001 lb3629 kg
 
Rig and sailsSealord 39 SloopSealord 39 Ketch
Upwind sail area
967 ft²89.83 m²
974 ft²90.48 m²
Downwind sail area
1828 ft²169.82 m²
1793 ft²166.56 m²
Mainsail area
352 ft²32.7 m²
274 ft²25.45 m²
Mizzen sail area
108 ft²10.03 m²
Genoa area
615 ft²57.13 m²
592 ft²55 m²
Solent area
352 ft²32.7 m²
325 ft²30.19 m²
Jib area
217 ft²20.16 m²
217 ft²20.16 m²
Stormjib area
125 ft²11.6 m²
125 ft²11.6 m²
Symmetric spinnaker area
1476 ft²137.12 m²
1411 ft²131.08 m²
Gennaker area
1071 ft²99.5 m²
1019 ft²94.67 m²
Rigging type
Sloop Marconi masthead
Ketch Marconi masthead
Mast configuration
Deck stepped mast
Deck stepped mast
Rotating spars
No
No
Number of levels of spreaders
1
1
Spreaders angle
0 °
0 °
Spars construction
Aluminum spars
Aluminum spars
Standing rigging
1x19 strand wire continuous
1x19 strand wire continuous
 
PerformancesSealord 39 SloopSealord 39 Ketch
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.
234 ft²/T21.75 m²/T
236 ft²/T21.91 m²/T
Downwind 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.
443 ft²/T41.12 m²/T
434 ft²/T40.33 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.
245
245
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.
43 %
43 %
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.
7.64 knots
7.64 knots
 
Auxiliary engineSealord 39 SloopSealord 39 Ketch
Engine(s)
1 inboard engine
1 inboard engine
Fuel type
Diesel
Diesel
Fuel tank capacity
53.4 gal202 liters
53.4 gal202 liters
 
Accommodations and layoutSealord 39 SloopSealord 39 Ketch
Cockpit
Center cockpit
Center cockpit
Cabin(s)
2
2
Berth(s) (min./max.)
6 / 8
6 / 8
Head(s)
2
2
Freshwater tank capacity
130.8 gal495 liters
130.8 gal495 liters
 
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