Detailed sailboat specifications and datasheets since 2015
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First 30 JK Shoal draft

Sailboat specifications

The First 30 JK is a 31’2” (9.52m) cruiser-racer sailboat designed by Juan Yacht Design (Spain). She was built between 2010 and 2015 by Bénéteau (France). The Shoal draft version features a shorter keel to grant access to shallow areas.

The First 30 JK is as well listed, on Boat-Specs.com, in Standard version (see all the versions compared).

First 30 JK's main features

Model
First 30 JK
Version
Shoal draft
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
Hull and deck: GRP (glass reinforced polyester)
First built hull
2010
Last built hull
2015
Appendages
Keel : fin with bulb
Helm
Single tiller (helm wheel in option)
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
B
Standard public price ex. VAT (indicative only)
N/A

First 30 JK's main dimensions

Overall length
32’ 2”9.81 m
Hull length
31’ 2”9.52 m
Waterline length
27’ 6”8.39 m
Beam (width)
10’ 7”3.23 m
Draft
4’ 11”1.5 m
Mast height from DWL
50’15.23 m
Light displacement (MLC)
8267 lb3750 kg
Ballast weight
2403 lb1090 kg
Ballast type
Cast iron

First 30 JK's rig and sails

Upwind sail area
677 ft²62.91 m²
Downwind sail area
1304 ft²121.11 m²
Mainsail area
367 ft²34.11 m²
Genoa area
310 ft²28.8 m²
Symmetric spinnaker area
936 ft²87 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
41’ 8”12.7 m
J
 iFore triangle base (from mast foot to bottom of forestay)
13’ 8”4.19 m
P
 iMainsail hoist measurement (from tack to head)
40’ 5”12.3 m
E
 iMainsail foot measurement (from tack to clew)
14’ 5”4.4 m
Rigging type
Sloop Marconi 9/10
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
Swept-back
Spars construction
Aluminum spars (carbon fiber spars as an option)
Standing rigging
1x19 strand wire

First 30 JK'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.
281 ft²/T26.06 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.
540 ft²/T50.18 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.
180
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.
29 %
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.
7.03 knots

First 30 JK's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
20 HP
Fuel type
Diesel
Fuel tank capacity
7.9 gal30 liters

First 30 JK's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
2
Berth(s) (min./max.)
4 / 6
Head(s)
1
Freshwater tank capacity
42.3 gal160 liters
Maximum headroom
6’ 1”1.85 m
Have you spotted incorrect data?  You can report it in the forum or contact the webmaster

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