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Sailboat specifications and datasheets

JPK 38 Fast Cruiser swing keel

The JPK 38 Fast Cruiser, here in "swing keel" version, is a 37’4” monohull sailboat designed by Jacques Valer. She was built by JPK (France) and made of sandwich PVC / fiberglass / vinylester (composite infusion). The production started in 2012 .

The JPK 38 Fast Cruiser is as well listed, on Boat-Specs.com, in version Fin keel.

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JPK 38 Fast Cruiser's   Main Features
Model JPK 38 Fast Cruiser
Version Swing keel
Type of hull Monohull
Category Offshore fast cruising sailboat
Shipyard
Designer Jacques Valer
Construction Hull and deck:
sandwich PVC / fiberglass / vinylester (composite infusion)
First built hull 2012
Last built hull Still in production
Appendages Keel (lifting) :
Swing keel
Helm 2 tillers
Rudder 2 spade rudders
Cockpit Open aft cockpit
Unsinkable No
Trailerable No
EC certification A
Standard public price ex. VAT (indicative only) About
180 000
(2017)
JPK 38 Fast Cruiser's   Main dimensions
Hull length 37’ 4”
Waterline length 34’ 1”
Beam (width) 13’ 1”
Draft 8’ 11”
Draft when appendages up 4’ 4”
Light displacement 11905 lbs
Ballast weight 4189 lbs
Ballast type Glass fiber/vinylester (infusion) fin with lead bulb
JPK 38 Fast Cruiser's   Rig and sails
Upwind sail area 797 sq.ft
Downwind sail area 1830 sq.ft
Mainsail area 431 sq.ft
Genoa area 366 sq.ft
Jib area 269 sq.ft
Asymetric spinnaker area 1399 sq.ft
Rigging type Sloop Marconi 9/10
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum (carbon fiber as an option)
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 49’ 8”
JiFore triangle base (from mast foot to bottom of forestay) 15’ 11”
PiMainsail hoist measurement (from tack to head) 47’ 8”
EiMainsail foot measurement (from tack to clew) 16’ 2”
JPK 38 Fast Cruiser's   Performances
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.
24.04
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.
55.23
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.
136
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.
35 %
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.
7.83 knots
JPK 38 Fast Cruiser's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 30 HP / 40 HP
Fuel type Diesel
Fuel tank capacity 19.8 gal
JPK 38 Fast Cruiser's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 4 / 7
Head(s) 1
Fresh water tank capacity 52.8 gal
Maximum headroom 6’ 4”
JPK 38 Fast Cruiser's   Fore cabin
Berth length 6’ 7”
Berth width 5’ 2”
JPK 38 Fast Cruiser's   Aft cabin
Berth length 6’ 5”
Berth width 4’ 11”

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