J/88

Sailboat specifications

The J/88 is a 29’2” (8.9m) cruiser-racer sailboat designed by Alan Johnstone (United States). She is built since 2013 by J/Boats (United States).

J/88's main features

Model: J/88
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: J/Boats
Sailboat designer: Alan Johnstone
Country: United States
Construction: GRP (glass reinforced polyester):
Sandwich fiberglass polyester (vacuum infusion)
First built hull: 2013
Last built hull: Still in production
Appendages: Keel : fin with bulb
Helm: Single tiller
Rudder: Single rudder on amas with t-foils
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
92 000 €
(2020)

J/88's main dimensions

Hull length: 29’ 2”8.9 m
Waterline length: 26’ 10”8.18 m
Beam (width): 9’ 6”2.9 m
Draft: 6’ 6”1.98 m
Light displacement (M_LC): 4960 lb2250 kg
Ballast weight: 1874 lb850 kg

J/88's rig and sails

Upwind sail area: 511 ft²47.5 m²
Downwind sail area: 1319 ft²122.5 m²
Mainsail area: 296 ft²27.5 m²
Genoa area: 215 ft²20 m²
Asymmetric spinnaker area: 1023 ft²95 m²
Rigging type: Sloop Marconi fractional
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Carbon fiber mast and aluminum boom
Standing rigging: Dyform

J/88'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.: 298 ft²/T27.66 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.: 768 ft²/T71.34 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.: 116
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.: 38 %
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.: 6.94 knots