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Sailboat Guide

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Sailboat

J/70

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

Dimensions

Length Overall
22.74 ft / 6.93 m
Waterline Length
20.47 ft / 6.24 m
Beam
7.38 ft / 2.25 m
Draft
4.92 ft / 1.50 m
Displacement
1,790 lb / 812 kg
Ballast
628 lb / 285 kg
Ballast Type
Lead
drawing

Rig and Sails

Type
Fractional Sloop
Reported Sail Area
226.00 ft2 / 21.00 m2
Total Sail Area
226.27 ft2 / 21.02 m2
Mainsail
Sail Area
123.48 ft2 / 11.47 m2
P
26.16 ft / 7.97 m
E
9.44 ft / 2.88 m
Mast Height
Foresail
Sail Area
102.80 ft2 / 9.55 m2
I
26.77 ft / 8.16 m
J
7.68 ft / 2.34 m
Est. Forestay Len.
27.85 ft / 8.49 m
Mizzen
PY
EY

Spinnaker

SPL/TPS
ISP
30.15 ft / 9.19 m

Auxilary Power

Make
?
Model
?
HP
?
Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?

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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