Detailed sailboat specifications and datasheets since 2015
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Jouët 680 Fin keel

Sailboat specifications

The Jouët 680 is a 21’6” (6.55m) cruising sailboat designed by Jean Berret (France). She was built between 1978 and 1984 by Yachting France (France) with 426 hulls completed. The Fin keel version adopts a classical fin configuration, the easiest option to provide a low center of gravity.

The Jouët 680 is as well listed, on Boat-Specs.com, in Centerboard (Trunk) version (see all the versions compared).

Jouët 680's main features

Model
Jouët 680
Version
Fin keel
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
426
First built hull
1978
Last built hull
1984
Appendages
Keel : fin without bulb
Helm
Single tiller
Rudder
Single transom hung rudder
Unsinkable
No
Trailerable
Yes
Former French navigation category
3
Standard public price ex. VAT (indicative only)
N/A

Jouët 680's main dimensions

Overall length
24’7.32 m
Hull length
21’ 6”6.55 m
Waterline length
19’ 10”6.04 m
Beam (width)
7’ 11”2.42 m
Waterline beam (width)
7’2.14 m
Draft
3’ 7”1.1 m
Fore freeboard
2’ 10”0.85 m
Mid-ship freeboard
2’ 10”0.86 m
Light displacement (MLC)
3307 lb1500 kg
Ballast weight
1422 lb645 kg
Ballast type
Cast iron interior ballast with steel centerboard
French customs tonnage
3.53 Tx

Jouët 680's rig and sails

Upwind sail area
270 ft²25.04 m²
Downwind sail area
447 ft²41.52 m²
Mainsail area
129 ft²12.02 m²
Genoa area
140 ft²13.02 m²
Jib area
90 ft²8.4 m²
Stormjib area
36 ft²3.3 m²
Symmetric spinnaker area
318 ft²29.5 m²
P
 iMainsail hoist measurement (from tack to head)
24’ 4”7.4 m
E
 iMainsail foot measurement (from tack to clew)
9’ 6”2.9 m
Rigging type
Sloop Marconi 7/8
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

Jouët 680's performances

IOR rating
 iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
16.0
HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
8.0
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.
206 ft²/T19.11 m²/T
Downwind 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.
341 ft²/T31.69 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.
193
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.
43 %
Wetted area
113 ft²10.51 m²
Maximum transverse section
7 ft²0.65 m²
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.
5.97 knots

Jouët 680's auxiliary engine

Engine(s)
1 outboard engine
Engine(s) power
9 HP
Fuel type
Gas

Jouët 680's accommodations and layout

Cockpit
Closed aft cockpit
Berth(s)
4
Freshwater tank capacity
5.3 gal20 liters
Maximum headroom
5’1.53 m

Jouët 680's saloon

Maximum headroom
4’ 6”1.36 m
Saloon table length
4’ 10”1.45 m
Saloon table width
1’ 11”0.58 m
Berth length
8’2.45 m
Berth width
1’ 10”0.55 m

Jouët 680's fore cabin

Maximum headroom
4’ 2”1.29 m
Berth length
6’1.82 m
Berth width
5’ 8”1.73 m
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