J/80

Sailboat specifications

The J/80 is a 26’2” (8m) one design sailboat designed by Rod Johnstone (United States). She is built since 1993 by J/Boats (United States).

J/80's main features

Model: J/80
Hull type: Monohull
Category: One design sailboat
Sailboat builder: J/Boats
Sailboat designer: Rod Johnstone
Country: United States
Construction: GRP (glass reinforced polyester):
Sandwich fiberglass polyester
Number of hulls built: About 1500
First built hull: 1993
Last built hull: Still in production
Appendages: Keel : fin with bulb
Helm: Single tiller
Rudder: Single transom hung rudder
Unsinkable: No
Trailerable: Yes
EC design category iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions) A: Wind < force 9, Waves < 10m B: Wind < force 8, Waves < 8m C: Wind < force 6, Waves < 4m D: Wind < force 4, Waves < 0,5m: B
Standard public price ex. VAT (indicative only): About
31 900 €
(2020)

J/80's main dimensions

Hull length: 26’ 2”8 m
Waterline length: 22’6.71 m
Beam (width): 8’ 2”2.49 m
Draft: 4’ 11”1.5 m
Light displacement (M_LC): 2910 lb1320 kg
Ballast weight: 1433 lb650 kg
Ballast type: Lead
French customs tonnage: 3.83 Tx

J/80's rig and sails

Upwind sail area: 443 ft²41.2 m²
Downwind sail area: 926 ft²86 m²
Mainsail area: 226 ft²21 m²
Genoa area: 217 ft²20.2 m²
Jib area: 156 ft²14.5 m²
Stormjib area: 32 ft²3 m²
Symmetric spinnaker area: 700 ft²65 m²
I iFore triangle height (from mast foot to fore stay top attachment): 31’ 6”9.6 m
J iFore triangle base (from mast foot to bottom of forestay): 9’ 6”2.9 m
P iMainsail hoist measurement (from tack to head): 30’9.14 m
E iMainsail foot measurement (from tack to clew): 12’ 6”3.81 m
Rigging type: Sloop Marconi 9/10
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire

J/80'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.: 369 ft²/T34.24 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.: 769 ft²/T71.47 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.: 124
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.: 49 %
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.: 6.29 knots