Detailed sailboat specifications and datasheets since 2015
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Centaur Ketch

Sailboat specifications

The Centaur is a 25’11” (7.9m) cruising sailboat designed by John Laurent Giles (United Kingdom). She was built between 1969 and 1980 by Westerly (United Kingdom) with 2444 hulls completed. The Ketch version displays a divided sail plan guarantying less effort and better balance adjustment.

The Centaur is as well listed, on Boat-Specs.com, in Sloop version (see all the versions compared).

Centaur's main features

Model
Centaur
Version
Ketch
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
Country
United Kingdom
Construction
Hull and deck: GRP (glass reinforced polyester)
Number of hulls built
2444
First built hull
1969
Last built hull
1980
Appendages
Twin keel : fin without bulb
Helm
Single tiller
Rudder
Single spade rudder
Unsinkable
No
Trailerable
No
Former French navigation category
2
Standard public price ex. VAT (indicative only)
N/A

Centaur's main dimensions

Overall length
27’ 11”8.5 m
Hull length
25’ 11”7.9 m
Waterline length
21’ 8”6.6 m
Beam (width)
8’ 6”2.6 m
Draft
3’0.9 m
Mast height from DWL
32’ 6”9.9 m
Light displacement (MLC)
6702 lb3040 kg
Ballast weight
2800 lb1270 kg
Ballast type
Cast iron
French customs tonnage
6.65 Tx

Centaur's rig and sails

Upwind sail area
384 ft²35.65 m²
Mainsail area
110 ft²10.2 m²
Mizzen sail area
37 ft²3.45 m²
Genoa area
237 ft²22 m²
Solent area
173 ft²16.1 m²
Jib area
110 ft²10.2 m²
Stormjib area
46 ft²4.25 m²
Rigging type
Sloop Marconi masthead
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
0 °
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Centaur'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.
183 ft²/T16.99 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.
299
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.
42 %
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.
6.24 knots

Centaur's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
10 HP / 25 HP
Fuel type
Diesel
Fuel tank capacity
11.9 gal45 liters

Centaur's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
1
Berth(s) (min./max.)
4 / 6
Head(s)
1
Freshwater tank capacity
17.7 gal67 liters
Maximum headroom
6’1.83 m
Have you spotted incorrect data?  You can report it in the forum or contact the webmaster

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Hull length
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1977
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1985
28’ 11”8.8 m
Longbow Ketch (Westerly)
1971
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Renown Ketch (Westerly)
1972
31’ 2”9.5 m
Albin Ballad (Albin Marine)
1971
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Catalina 27 Tall rig (Catalina Yachts)
1971
26’ 10”8.18 m
Merlin 28 Twin keel (Westerly)
1984
27’ 1”8.25 m
Griffon 26 Twin keel (Westerly)
1979
26’7.93 m
Centaur Sloop (Westerly)
1969
25’ 11”7.9 m
Super Daïmio Shoal draft (CNSO Constructions Nautique du Sud-Ouest)
1975
27’ 7”8.4 m
Idylle 8.80 Twin keel (Bénéteau)
1982
27’ 11”8.5 m
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1982
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Dufour 2800 Shoal draft (Dufour)
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