The **JPK 960** is a 31’6” (9.6m) cruiser-racer sailboat designed by *Jacques Valer* (France). She was built since 2003 (and now discontinued) by *JPK* (France).

- Model
- JPK 960
- Hull type
- Monohull
- Category
- Cruiser-racer sailboat
- Sailboat builder
- Sailboat designer
- Country
- France
- Construction
- GRP (glass reinforced polyester):

Sandwich fiberglass polyester (vacuum infusion) - First built hull
- 2003
- Last built hull
- Discontinued
- Appendages
- Keel : fin with bulb
- Helm
- Single tiller
- Rudder
- Twin transom hung 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)
- About81 500 €(2006)

- Hull length
- 31’ 6”9.6 m
- Waterline length
- 28’ 2”8.6 m
- Beam (width)
- 11’ 5”3.48 m
- Waterline beam (width)
- 8’ 1”2.48 m
- Draft
- 6’ 5”1.95 m
- Light displacement (M
_{LC}) - 7496 lb3400 kg
- Ballast weight
- 3086 lb1400 kg
- Ballast type
- Cast iron fin with lead bulb

- Upwind sail area
- 603 ft²56 m²
- Downwind sail area
- 1313 ft²122 m²
- Mainsail area
- 344 ft²32 m²
- Genoa area
- 258 ft²24 m²
- Symmetric spinnaker area
- 818 ft²76 m²
- Asymmetric spinnaker area
- 969 ft²90 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
- Aluminum spars

- 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. - 267 ft²/T24.77 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. - 581 ft²/T53.96 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. - 151
- 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. - 41 %
- Prismatic coefficient
*iThe 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 moment
*iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. 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. - 21699 lb.ft3000 kg.m @
- 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. - 7.12 knots

- Engine(s)
- 1 inboard engine
- Engine(s) power
- 18 HP
- Fuel type
- Diesel
- Fuel tank capacity
- 9.2 gal35 liters

- Cockpit
- Open aft cockpit
- Cabin(s)
- 2
- Berth(s) (min./max.)
- 4 / 6
- Head(s)
- 1
- Freshwater tank capacity
- 21.1 gal80 liters
- Maximum headroom
- 6’1.83 m
- Galley headroom
- 5’ 11”1.8 m

- Maximum headroom
- 5’ 11”1.8 m
- Saloon table length
- 3’ 8”1.13 m
- Saloon table width
- 2’ 11”0.87 m
- Berth length
- 6’ 1”1.87 m
- Chart table
- 2’ 8”0.81 m x 2’0.6 m
- Berth width
- 1’ 8”0.52 m

- Berth length
- 6’ 2”1.9 m
- Berth width
- 4’ 11”1.5 m

- Maximum headroom
- 6’1.83 m
- Berth length
- 6’ 5”1.95 m
- Berth width (head/feet)
- 5’1.53 m / 3’ 8”1.14 m

Sailboats

First built hull

Hull length

2015

36’ 1”10.99 m

2017

32’9.75 m

2005

32’ 10”9.99 m

1994

29’ 6”8.98 m

2016

35’ 10”10.9 m

2017

40’12.2 m

1971

30’9.14 m

1994

33’10.06 m

1999

27’ 11”8.5 m

2013

29’ 2”8.9 m

2005

29’ 11”9.12 m

2010

31’ 2”9.52 m

2009

31’ 8”9.65 m

1990

30’9.14 m

1997

31’ 2”9.5 m