Detailed sailboat specifications and datasheets since 2015
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Longbow Ketch

Sailboat specifications

The Longbow is a 31’2” (9.5m) cruising sailboat designed by John Laurent Giles (United Kingdom). She was built between 1971 and 1980 by Westerly (United Kingdom) with 265 hulls completed. The Ketch version displays a divided sail plan guarantying less effort and better balance adjustment.

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

Longbow's main features

Model
Longbow
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
265
First built hull
1971
Last built hull
1980
Appendages
Keel : fin without bulb
Helm
Single tiller
Rudder
Single rudder on skeg
Unsinkable
No
Trailerable
No
Standard public price ex. VAT (indicative only)
N/A

Longbow's main dimensions

Overall length
32’ 6”9.9 m
Hull length
31’ 2”9.5 m
Waterline length
24’7.3 m
Beam (width)
9’ 6”2.9 m
Draft
4’ 6”1.38 m
Mast height from DWL
41’ 7”12.67 m
Light displacement (MLC)
8378 lb3800 kg
Ballast weight
3990 lb1810 kg

Longbow's rig and sails

Upwind sail area
533 ft²49.5 m²
Mainsail area
150 ft²13.9 m²
Mizzen sail area
54 ft²5 m²
Genoa area
329 ft²30.6 m²
Solent area
237 ft²22 m²
Jib area
152 ft²14.1 m²
Stormjib area
61 ft²5.7 m²
Rigging type
Ketch 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

Longbow'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.
219 ft²/T20.33 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.
277
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.
48 %
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.
6.56 knots

Longbow's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
25 HP
Fuel type
Diesel

Longbow's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
1
Berth(s) (min./max.)
4 / 6
Head(s)
1
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Hull length
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1971
31’ 2”9.5 m
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1972
31’ 2”9.5 m
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1971
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Symphonie Shoal draft (Jeanneau)
1978
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Catalina 30 MkII Tall rig (Catalina Yachts)
1986
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1984
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Griffon 26 Fin keel (Westerly)
1979
26’7.93 m
Fango (Amel)
1985
32’ 10”10 m
Centaur Ketch (Westerly)
1969
25’ 11”7.9 m
Super Daïmio Shoal draft (CNSO Constructions Nautique du Sud-Ouest)
1975
27’ 7”8.4 m
Attalia 32 Deep draft (Jeanneau)
1983
30’ 2”9.2 m
Brin de folie Standard (Jeanneau)
1975
29’ 6”9 m
Moody 31 MkI Fin keel (Moody)
1983
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Dufour 3800 Shoal draft (Dufour)
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