Detailed sailboat specifications and datasheets since 2015
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J/122e Shoal draft

Sailboat specifications

The J/122e is a 40’ (12.19m) racer-cruiser sailboat designed by Rod Johnstone (United States). She is built since 2006 by J/Boats (United States). The Shoal draft version features a shorter keel to grant access to shallow areas.

The J/122e is as well listed, on Boat-Specs.com, in Standard version (see all the versions compared).

J/122e's main features

Model
J/122e
Version
Shoal draft
Hull type
Monohull
Category
Offshore racer-cruiser sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
United States
Construction
GRP (glass reinforced polyester):
Sandwich fiberglass polyester (vacuum infusion)
First built hull
2006
Last built hull
Still in production
Appendages
Keel : fin with bulb
Helm
Single helm wheel
Rudder
Single spade rudder
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 
284 000
 (2020)

J/122e's main dimensions

Hull length
40’12.19 m
Waterline length
34’ 7”10.55 m
Beam (width)
11’ 11”3.63 m
Draft
6’ 4”1.92 m
Light displacement (MLC)
15410 lb6990 kg
Ballast weight
6349 lb2880 kg
Ballast type
Cast iron fin with lead bulb

J/122e's rig and sails

Upwind sail area
969 ft²90 m²
Downwind sail area
2153 ft²200 m²
Mainsail area
538 ft²50 m²
Genoa area
431 ft²40 m²
Solent area
301 ft²28 m²
Stormjib area
65 ft²6 m²
Symmetric spinnaker area
1615 ft²150 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
54’ 5”16.59 m
J
 iFore triangle base (from mast foot to bottom of forestay)
15’ 2”4.63 m
P
 iMainsail hoist measurement (from tack to head)
51’ 4”15.65 m
E
 iMainsail foot measurement (from tack to clew)
17’ 7”5.36 m
Rigging type
Sloop Marconi fractional
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
Single-strand (ROD)

J/122e'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.
265 ft²/T24.62 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.
589 ft²/T54.71 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.
169
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 %
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.
7.88 knots

J/122e's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
30 HP / 40 HP
Fuel type
Diesel
Fuel tank capacity
26.4 gal100 liters

J/122e's accommodations and layout

Cockpit
Open aft cockpit
Cabin(s) (min./max.)
2 / 3
Berth(s) (min./max.)
6 / 8
Head(s) (min./max.)
1 / 2
Freshwater tank capacity
42.3 gal160 liters
Boiler capacity
5 gal19 liters
Maximum headroom
6’ 2”1.9 m

J/122e's saloon

Maximum headroom
6’ 4”1.93 m
Berth length
6’ 7”2 m
Berth width
2’ 2”0.66 m

J/122e's fore cabin

Maximum headroom
6’ 2”1.88 m
Berth length
6’ 7”2 m
Berth width
5’1.52 m

J/122e's aft cabin

Maximum headroom
6’ 2”1.9 m
Berth length
6’ 7”2 m
Berth width
4’ 6”1.37 m
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