Sailboat specifications and datasheets

Westerly Renown sloop

The Westerly Renown, here in "sloop" version, is a 31’2” 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 1972 and 1980 with 273 hulls completed.

The Westerly Renown is as well listed, on, in version Ketch.

Westerly Renown Westerly Renown sailplanWesterly Renown layoutWesterly Renown sailingWesterly Renown accommodations
Westerly Renown's   Main Features
Model Westerly Renown
Version Sloop
Type of hull Monohull
Category Cruising sailboat
Designer John Laurent Giles
Construction GRP (glass reinforced polyester)
First built hull 1972
Last built hull 1980
Number of hulls built 273
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 rudder on skeg
Cockpit Central cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Westerly Renown's   Main dimensions
Length overall 31’ 2”
Hull length 31’ 2”
Waterline length 25’
Beam (width) 9’ 6”
Draft 4’ 6”
Light displacement 10851 lbs
Ballast weight 4189 lbs
Ballast type Cast iron
Westerly Renown's   Rig and sails
Upwind sail area 540 sq.ft
Mainsail area 207 sq.ft
Genoa area 334 sq.ft
Solent area 236 sq.ft
Jib area 151 sq.ft
Stormjib area 60 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 Renown'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.
39 %
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.
6.70 knots
Westerly Renown's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 25 HP
Fuel type Diesel
Fuel tank capacity 23.8 gal
Westerly Renown's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 35.7 gal
Maximum headroom 6’ 2”

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