Sailboat specifications and datasheets

Westerly Centaur ketch

The Westerly Centaur, here in "ketch" version, is a 25’11” monohull sailboat designed by John Laurent Giles. She was built by Westerly (United Kingdom) and made of GRP (glass reinforced polyester). This sailboat was produced between 1969 and 1980 with 2444 hulls completed.

The Westerly Centaur is as well listed, on, in version Sloop.

Westerly Centaur Westerly Centaur sailplanWesterly Centaur sailplanWesterly Centaur layoutWesterly Centaur layoutWesterly Centaur layoutWesterly Centaur sailingWesterly Centaur sailingWesterly Centaur accommodationsWesterly Centaur accommodationsWesterly Centaur accommodationsWesterly Centaur accommodations
Westerly Centaur's   Main Features
Model Westerly Centaur
Version Ketch
Type of hull Monohull
Category Cruising sailboat
Designer John Laurent Giles
Construction GRP (glass reinforced polyester)
First built hull 1969
Last built hull 1980
Number of hulls built 2444
Appendages Twin keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
French navigation category 2
Standard public price ex. VAT (indicative only)
Westerly Centaur's   Main dimensions
Length overall 27’ 11”
Hull length 25’ 11”
Waterline length 21’ 8”
Beam (width) 8’ 6”
Draft 3’
Mast height from DWL 32’ 6”
Light displacement 6702 lbs
Ballast weight 2800 lbs
Ballast type Cast iron
French customs tonnage 6.65 Tx
Westerly Centaur's   Rig and sails
Upwind sail area 384 sq.ft
Mainsail area 110 sq.ft
Mizzen sail area 37 sq.ft
Genoa area 237 sq.ft
Solent area 173 sq.ft
Jib area 110 sq.ft
Stormjib area 46 sq.ft
Rigging type Sloop 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 °
Westerly Centaur'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.
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.
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.
42 %
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.
6.24 knots
Westerly Centaur's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 10 HP / 25 HP
Fuel type Diesel
Fuel tank capacity 11.9 gal
Westerly Centaur's   Accommodation
Cabin(s) 1
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 17.7 gal
Maximum headroom 6’

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