JPK 40

Sailboat specifications

The JPK 40 is a 40’ (12.18m) racing sailboat designed by Jacques Valer (France). She was built since 2007 (and now discontinued) by JPK (France).

JPK 40's main features

Model: JPK 40
Hull type: Monohull
Category: Offshore racing sailboat
Sailboat builder: JPK
Sailboat designer: Jacques Valer
Sailboat collection: Class 40
Country: France
Construction: GRP (glass reinforced polyester):
Sandwich PVC fiberglass vinylester (vacuum infusion)
First built hull: 2007
Last built hull: Discontinued
Appendages: Keel : fin with bulb
Helm: Twin tillers
Rudder: Twin spade rudders
Unsinkable: No
Trailerable: No
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
198 000 €
(2008)

JPK 40's main dimensions

Hull length: 40’12.18 m
Waterline length: 40’12.18 m
Beam (width): 14’ 1”4.3 m
Draft: 9’ 10”3 m
Light displacement (M_LC): 10141 lb4600 kg
Ballast weight: 4519 lb2050 kg
Ballast type: Steel fin with lead bulb
Water ballast: Lateral water ballasts
Water ballast capacity: 2198.1 gal750 liters

JPK 40's rig and sails

Upwind sail area: 1238 ft²115 m²
Downwind sail area: 2960 ft²275 m²
Mainsail area: 807 ft²75 m²
Solent area: 431 ft²40 m²
Asymmetric spinnaker area: 2153 ft²200 m²
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: Carbon fiber mast and aluminum boom
Standing rigging: 1x19 strand wire

JPK 40'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.: 448 ft²/T41.58 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.: 1070 ft²/T99.42 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.: 72
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.: 45 %
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.: 8.47 knots