Detailed sailboat specifications and datasheets since 2015
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Imperial & Metricboth
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J/100 (Standard) vs J/100 (Shoal draft)

Main featuresJ/100 StandardJ/100 Shoal draft
Model
J/100
J/100
Version
Standard
Shoal draft
Hull type
Monohull
Monohull
Category
Dayboat
Dayboat
Sailboat builder
J/Boats
J/Boats
Sailboat designer
Country
United States
United States
Construction
GRP (glass reinforced polyester):
Sandwich fiberglass polyester
GRP (glass reinforced polyester):
Sandwich fiberglass polyester
First built hull
2004
2004
Last built hull
Discontinued
Discontinued
Appendages
Keel : L-shaped keel (with bulb)
Keel : L-shaped keel (with bulb)
Helm
Single tiller
Single tiller
Rudder
Single spade rudder
Single spade rudder
Unsinkable
No
No
Trailerable
No
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
A
 
Main dimensionsJ/100 StandardJ/100 Shoal draft
Hull length
32’ 10”10 m
32’ 10”10 m
Waterline length
29’8.84 m
29’8.84 m
Beam (width)
9’ 2”2.81 m
9’ 2”2.81 m
Draft
5’ 8”1.75 m
4’ 6”1.37 m
Mast height from DWL
46’ 1”14.04 m
46’ 1”14.04 m
Light displacement (MLC)
6504 lb2950 kg
6504 lb2950 kg
Ballast weight
2491 lb1130 kg
2491 lb1130 kg
Ballast type
Lead
Lead
 
Rig and sailsJ/100 StandardJ/100 Shoal draft
Upwind sail area
478 ft²44.4 m²
478 ft²44.4 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
38’ 6”11.73 m
38’ 6”11.73 m
J
 iFore triangle base (from mast foot to bottom of forestay)
11’ 6”3.51 m
11’ 6”3.51 m
P
 iMainsail hoist measurement (from tack to head)
38’11.58 m
38’11.58 m
E
 iMainsail foot measurement (from tack to clew)
13’ 6”4.11 m
13’ 6”4.11 m
Rigging type
Sloop Marconi fractional
Sloop Marconi fractional
Mast configuration
Keel stepped mast
Keel stepped mast
Rotating spars
No
No
Number of levels of spreaders
2
2
Spreaders angle
Swept-back
Swept-back
Spars construction
Carbon fiber mast and aluminum boom
Carbon fiber mast and aluminum boom
Standing rigging
Single-strand (ROD)
Single-strand (ROD)
 
PerformancesJ/100 StandardJ/100 Shoal draft
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.
232 ft²/T21.59 m²/T
232 ft²/T21.59 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.
121
121
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.
38 %
38 %
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.
7.22 knots
7.22 knots
 
Auxiliary engineJ/100 StandardJ/100 Shoal draft
Engine(s)
1 inboard engine
1 inboard engine
Engine(s) power
15 HP
15 HP
Fuel type
Diesel
Diesel
Fuel tank capacity
10.6 gal40 liters
10.6 gal40 liters
 
Accommodations and layoutJ/100 StandardJ/100 Shoal draft
Cockpit
Closed aft cockpit
Closed aft cockpit
Cabin(s)
1
1
Berth(s)
4
4
Head(s)
1
1
Freshwater tank capacity
5 gal19 liters
5 gal19 liters
Holding tank capacity
14 gal53 liters
14 gal53 liters
Maximum headroom
4’ 10”1.45 m
4’ 10”1.45 m
 
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