Detailed sailboat specifications and datasheets since 2015
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J/11S

Sailboat specifications

The J/11S is a 35’10” (10.9m) cruiser-racer sailboat designed by Alan Johnstone (United States). She was built between 2016 and 2019 by J/Boats (United States).

J/11S's main features

Model
J/11S
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Sailboat designer
Country
United States
Construction
GRP (glass reinforced polyester):
Sandwich fiberglass polyester
First built hull
2016
Last built hull
2019
Appendages
Keel : fin with bulb
Helm
Single tiller
Rudder
Twin spade 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)
About 
165 000
 (2017)

J/11S's main dimensions

Hull length
35’ 10”10.9 m
Waterline length
32’ 11”10.04 m
Beam (width)
10’ 11”3.31 m
Draft
7’ 2”2.2 m
Light displacement (MLC)
10141 lb4600 kg
Ballast weight
3461 lb1570 kg

J/11S's rig and sails

Upwind sail area
678 ft²63 m²
Downwind sail area
1023 ft²95 m²
Symmetric spinnaker area
1023 ft²95 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
Standing rigging
Dyform

J/11S'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.
245 ft²/T22.78 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.
370 ft²/T34.35 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.
129
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.
34 %
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.
7.69 knots

J/11S's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
18 HP
Fuel type
Diesel
Fuel tank capacity
13.2 gal50 liters

J/11S's accommodations and layout

Cockpit
Open aft cockpit
Cabin(s)
3
Berth(s) (min./max.)
6 / 8
Head(s)
1
Freshwater tank capacity
26.4 gal100 liters
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