J/70

2012
Designer
Alan Johnstone
Builder
J Boats
Associations
J/70 International Class Association
J/70 Class Association
# Built
1100
Hull Type
Fin w/transom hung rudder
Construction
FG

Dimensions

Length Overall
22 8 / 6.9 m
Waterline Length
20 5 / 6.2 m
Beam
7 4 / 2.3 m
Draft
4 11 / 1.5 m
Displacement
1,790 lbs / 812 kg
Ballast
630 lbs / 285 kg (Lead)
drawing

Rig and Sails

Type
Fractional Sloop
Reported Sail Area
226 ft2 / 21 m2
Total Sail Area
226.3 ft2 / 21 m2
Mainsail
Sail Area
123.5 ft2 / 11.5 m2
P
26 1 / 8 m
E
9 5 / 2.9 m
Mast Height
?
Foresail
Sail Area
102.8 ft2 / 9.6 m2
I
26 9 / 8.2 m
J
7 8 / 2.3 m
Forestay Length
27 10 / 8.5 m
Spinnaker
SPL/TPS
?
ISP
30 1 / 9.2 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
6.06 knots
Sail Area/Displacement
24.53
high performance
Ballast/Displacement
35.08
less stiff, less powerful
Displacement/Length
93.16
Ultralight
Comfort Ratio
9.07
lightweight racing boat
Capsize Screening
2.43
better suited for coastal cruising

Notes

Spinnaker (asym.) area: 491 sq.ft./45 m²
More than 1100 delivered as of 2016.


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