Detailed sailboat specifications and datasheets since 2015
MetricSI (m)
Imperial & Metricboth
ImperialIMP (ft)

Jouët 680 (Fin keel) vs Jouët 680 (Centerboard (Trunk))

Main featuresJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Model
Jouët 680
Jouët 680
Version
Fin keel
Centerboard (Trunk)
Hull type
Monohull
Monohull
Category
Cruising sailboat
Cruising sailboat
Sailboat builder
Yachting France
Yachting France
Sailboat designer
Sailboat range
Country
France
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
426
426
First built hull
1978
1978
Last built hull
1984
1984
Appendages
Keel : fin without bulb
Centerboard : pivoting centerboard
Helm
Single tiller
Single tiller
Rudder
Single transom hung rudder
Single transom hung rudder
Unsinkable
No
No
Trailerable
Yes
Yes
Former French navigation category
3
3
 
Main dimensionsJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Overall length
24’7.32 m
24’7.32 m
Hull length
21’ 6”6.55 m
21’ 6”6.55 m
Waterline length
19’ 10”6.04 m
19’ 10”6.04 m
Beam (width)
7’ 11”2.42 m
7’ 11”2.42 m
Waterline beam (width)
7’2.14 m
7’2.14 m
Draft
3’ 7”1.1 m
4’ 8”1.44 m
Draft when appendages up
1’ 5”0.42 m
Fore freeboard
2’ 10”0.85 m
2’ 10”0.85 m
Mid-ship freeboard
2’ 10”0.86 m
2’ 10”0.86 m
Light displacement (MLC)
3307 lb1500 kg
3307 lb1500 kg
Ballast weight
1422 lb645 kg
1422 lb645 kg
Ballast type
Cast iron interior ballast with steel centerboard
Cast iron interior ballast with steel centerboard
French customs tonnage
3.53 Tx
3.53 Tx
 
Rig and sailsJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Upwind sail area
270 ft²25.04 m²
270 ft²25.04 m²
Downwind sail area
447 ft²41.52 m²
447 ft²41.52 m²
Mainsail area
129 ft²12.02 m²
129 ft²12.02 m²
Genoa area
140 ft²13.02 m²
140 ft²13.02 m²
Jib area
90 ft²8.4 m²
90 ft²8.4 m²
Stormjib area
36 ft²3.3 m²
36 ft²3.3 m²
Symmetric spinnaker area
318 ft²29.5 m²
318 ft²29.5 m²
P
 iMainsail hoist measurement (from tack to head)
24’ 4”7.4 m
24’ 4”7.4 m
E
 iMainsail foot measurement (from tack to clew)
9’ 6”2.9 m
9’ 6”2.9 m
Rigging type
Sloop Marconi 7/8
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Deck stepped mast
Rotating spars
No
No
Number of levels of spreaders
1
1
Spreaders angle
0 °
0 °
Spars construction
Aluminum spars
Aluminum spars
Standing rigging
1x19 strand wire continuous
1x19 strand wire continuous
 
PerformancesJouët 680 Fin keelJouët 680 Centerboard (Trunk)
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
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
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
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
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
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 %
43 %
Wetted area
113 ft²10.51 m²
113 ft²10.51 m²
Maximum transverse section
7 ft²0.65 m²
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
5.97 knots
 
Auxiliary engineJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Engine(s)
1 outboard engine
1 outboard engine
Engine(s) power
9 HP
9 HP
Fuel type
Gas
Gas
 
Accommodations and layoutJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Cockpit
Closed aft cockpit
Closed aft cockpit
Berth(s)
4
4
Freshwater tank capacity
5.3 gal20 liters
5.3 gal20 liters
Maximum headroom
5’1.53 m
5’1.53 m
 
SaloonJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Maximum headroom
4’ 6”1.36 m
4’ 6”1.36 m
Saloon table length
4’ 10”1.45 m
4’ 10”1.45 m
Saloon table width
1’ 11”0.58 m
1’ 11”0.58 m
Berth length
8’2.45 m
8’2.45 m
Berth width
1’ 10”0.55 m
1’ 10”0.55 m
 
Fore cabinJouët 680 Fin keelJouët 680 Centerboard (Trunk)
Maximum headroom
4’ 2”1.29 m
4’ 2”1.29 m
Berth length
6’1.82 m
6’1.82 m
Berth width
5’ 8”1.73 m
5’ 8”1.73 m
 
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