OceanWaveSail Free Searchable Sailboats Database


J70 is a One design sailboat built by J/Boats and designed by Alan Johnstone. Her first hull was built in 2012 and a Deck stepped mast mast configuration.

Compare Sailboats

J70 Sailboat Specifications​


Builder(s)J Boats Tillotson Pearson
Designer(s)Alan Johnstone
BrandJ Boats
categoryOne design sailboat
CountryUnited States
Hull TypeMonohull
First Hull Built2012
Last Hull BuiltStill in production
AppendagesLifting keel fin with bulb lifting
HelmSingle tiller
RudderSingle transom hung rudder
CockpitOpen aft cockpit
Ballast TypeLead
Rigging TypeSloop Marconi fractional
Mast LayoutDeck stepped mast
Number of Berth(s)2
Ballast Ratio0.36


Hull Length6.93 m / 22.8 ft
Waterline Length (LWL)6.24 m / 20.6 ft
Beam (width)2.25 m / 7.5 ft
Draft1.45 m / 4.10 ft
Light Displacement (MLC) 795 kg / 1753 lb
Ballast Weight290 kg / 639 lb


Critical Hull Speed6.06 knots
Displacement-Length Ratio (DLR)93
Ballast Ratio0.36
Upwind Sail Area to Displacement30.74 m²/T / 331 ft²/T
Downwind Sail Area to Displacement71.16 m²/T / 766 ft²/T

Above Deck

Mast LayoutDeck stepped mast
Mast Height from DWL10 m / 32.10 ft
Rotating SparsNo
Number of Levels of Spreaders1
Spreaders AngleSwept-back
Spars ConstructionCarbon fiber spars
Standing Rigging1x19 strand wire continuous
Upwind Sail Area26.38 m² / 284 ft²
Downwind Sail Area61.07 m² / 657 ft²
Mainsail Area16.07 m² / 173 ft²
I26.10 ft * 8.16 m
J7.8 ft * 2.34 m
P26.1 ft * 7.97 m
E9.5 ft * 2.88 m

Engine Room

Engine(s)1 outboard engine
Fuel typeGas
error: Content is protected !!