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Sailboat specifications and datasheets

Griffon 26 twin keel

The Griffon 26, here in "twin keel" version, is a 26’ 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 1979 and 1989 with 454 hulls completed.

The Griffon 26 is as well listed, on Boat-Specs.com, in version Fin keel.

Westerly  Griffon 26 Westerly  Griffon 26 sailplanWesterly  Griffon 26 layout
Griffon 26's   Main Features
Model Griffon 26
Version Twin keel
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Edward Dubois
Construction GRP (glass reinforced polyester)
First built hull 1979
Last built hull 1989
Number of hulls built 454
Appendages Twin keel :
Fin without bulb
Helm 1 tiller
Rudder 1 transom hung rudder
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
Standard public price ex. VAT (indicative only) N/A
Griffon 26's   Main dimensions
Hull length 26’
Waterline length 21’ 7”
Beam (width) 9’ 4”
Draft 3’ 2”
Light displacement 5900 lbs
Ballast weight 2723 lbs
Griffon 26's   Rig and sails
Upwind sail area 412 sq.ft
Downwind sail area 793 sq.ft
Mainsail area 147 sq.ft
Genoa area 264 sq.ft
Solent area 212 sq.ft
Jib area 134 sq.ft
Symetric spinnaker area 646 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 °
Griffon 26'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.
19.84
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.
38.24
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.
265
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.
46 %
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.
6.23 knots
Griffon 26's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 20 HP
Fuel type Diesel
Griffon 26's   Accommodation
Maximum headroom 5’ 11”
Griffon 26's   Saloon
Berth length 6’ 5”
Berth width 3’ 10”

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