JPK 998

Sailboat specifications

The JPK 998 is a 32’8” (9.98m) racing sailboat designed by Jacques Valer (France). She was built since 2008 (and now discontinued) by JPK (France).

JPK 998's main features

Model: JPK 998
Hull type: Monohull
Category: Racing sailboat
Sailboat builder: JPK
Sailboat designer: Jacques Valer
Country: France
Construction: GRP (glass reinforced polyester):
Sandwich balsa fiberglass vinylester (vacuum infusion)
First built hull: 2008
Last built hull: Discontinued
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: A
Standard public price ex. VAT (indicative only): About
99 000 €
(2008)

JPK 998's main dimensions

Hull length: 32’ 8”9.98 m
Waterline length: 31’ 1”9.48 m
Beam (width): 9’ 10”2.99 m
Draft: 6’ 11”2.1 m
Light displacement (M_LC): 5952 lb2700 kg
Ballast weight: 2976 lb1350 kg
Ballast type: Steel fin with lead bulb

JPK 998's rig and sails

Upwind sail area: 689 ft²64 m²
Downwind sail area: 1539 ft²143 m²
Mainsail area: 409 ft²38 m²
Genoa area: 280 ft²26 m²
Symmetric spinnaker area: 1023 ft²95 m²
Asymmetric spinnaker area: 1130 ft²105 m²
Rigging type: Sloop Marconi 9/10
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: No spreader
Spars construction: Carbon fiber mast and aluminum boom
Standing rigging: Single-strand (ROD)

JPK 998'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.: 355 ft²/T33.01 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.: 794 ft²/T73.75 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.: 90
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.: 50 %
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.: 7.47 knots