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Sailboat specifications and datasheets

Merlin 28 twin keel

The Merlin 28, here in "twin keel" version, is a 27’1” 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 1984 and 1990 with 151 hulls completed.

The Merlin 28 is as well listed, on Boat-Specs.com, in version Fin keel.

Westerly  Merlin 28 Westerly  Merlin 28 sailplan
Merlin 28's   Main Features
Model Merlin 28
Version Twin keel
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Edward Dubois
Construction GRP (glass reinforced polyester)
First built hull 1984
Last built hull 1990
Number of hulls built 151
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
Merlin 28's   Main dimensions
Length overall 28’ 8”
Hull length 27’ 1”
Waterline length 23’ 7”
Beam (width) 9’ 11”
Draft 3’ 5”
Mast height from DWL 36’ 8”
Light displacement 8036 lbs
Ballast weight 3329 lbs
Merlin 28's   Rig and sails
Upwind sail area 443 sq.ft
Downwind sail area 618 sq.ft
Mainsail area 208 sq.ft
Genoa area 236 sq.ft
Jib area 129 sq.ft
Stormjib area 46 sq.ft
Symetric spinnaker area 410 sq.ft
Rigging type Sloop Marconi 7/8
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 Swept-back
Merlin 28'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.
17.40
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.
24.24
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.
277
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.
41 %
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.
6.51 knots
Merlin 28's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Fuel type Diesel
Fuel tank capacity 21.4 gal
Merlin 28's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 20.1 gal

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