**JPK 960**is a 31’6”

**monohull sailboat**designed by

*Jacques Valer*. She was built by

*JPK*(France) and made of sandwich fiberglass / polyester (composite infusion). The production started in 2003 .

JPK 960's Main Features | |
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Model | JPK 960 |

Type of hull | Monohull |

Category | Cruiser-racer sailboat |

Shipyard | |

Designer | Jacques Valer |

Construction | Hull and deck: sandwich fiberglass / polyester (composite infusion) |

First built hull | 2003 |

Last built hull | Discontinued |

Appendages | Keel : Fin with bulb |

Helm | 1 tiller |

Rudder | 2 transom hung rudders |

Cockpit | Open aft cockpit |

Unsinkable | No |

Trailerable | No |

EC certification | A |

Standard public price ex. VAT (indicative only) | About 81 500 € (2006) |

JPK 960's Main dimensions | |
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Hull length | 31’ 6” |

Waterline length | 28’ 2” |

Beam (width) | 11’ 5” |

Waterline beam (width) | 8’ 1” |

Draft | 6’ 5” |

Light displacement | 7496 lbs |

Ballast weight | 3086 lbs |

Ballast type | Cast iron fin with lead bulb |

JPK 960's Rig and sails | |
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Upwind sail area | 603 sq.ft |

Downwind sail area | 1313 sq.ft |

Mainsail area | 344 sq.ft |

Genoa area | 258 sq.ft |

Symetric spinnaker area | 818 sq.ft |

Asymetric spinnaker area | 969 sq.ft |

Rigging type | Sloop Marconi 9/10 |

Rotating spars | No |

Mast position | Keel stepped mast |

Spars | Mast and boom in Aluminum |

Number of levels of spreaders | 2 |

Spreaders angle | Swept-back |

JPK 960's Performances | |
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Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat. |
24.77 |

Downwind sail area to displacementiThe 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 23 it indicates a fast sailboat. |
53.96 |

Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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. |
151 |

Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.Higher the ballast ratio is, greater is the stability. |
41 % |

Prismatic coefficientiThe prismatic coefficient is obtained by dividing the volume of the boat (mass divided by the density of water) by the waterline length multiplied by the area of the maximum transverse section. This coefficient describes the effectiveness of a sailboat for a certain speed range: lower is the coefficient (<0.45), more effective the yacht is below its hull speed; higher the coefficient is, more the boat is suitable for planning speed. |
0.55 |

Maximum righting momentiThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. Its value corresponds to the torque needed to heel the boat for this angle.Higher the righting moment is for an angle, greater is the stability at this angle. |
21699 lbs.ft |

Hull speediAs 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. |
7.12 knots |

JPK 960's Auxiliary engine | |
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Engine(s) | 1 |

Engine type | Inboard engine |

Engine | 18 HP |

Fuel type | Diesel |

Fuel tank capacity | 9.2 gal |

JPK 960's Accommodation | |
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Cabin(s) | 2 |

Berth(s) (min/max) | 4 / 6 |

Head(s) | 1 |

Fresh water tank capacity | 21.1 gal |

Chart table | 2’ 8” x 2’ |

Maximum headroom | 6’ |

Galley headroom | 5’ 11” |

JPK 960's Saloon | |
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Maximum headroom | 5’ 11” |

Saloon table length | 3’ 8” |

Saloon table width | 2’ 11” |

Berth length | 6’ 1” |

Berth width | 1’ 8” |

JPK 960's Fore cabin | |
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Berth length | 6’ 2” |

Berth width | 4’ 11” |

JPK 960's Aft cabin | |
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Maximum headroom | 6’ |

Berth length | 6’ 5” |

Berth width (head/feet) | 5’ 3’ 8” |