J/70 introduces a new dimension of fun, fast sailing in a stable, easy
to own boat. A natural evolution of its J pedigree, the J/70's 22-foot
long waterline with high aspect, all carbon rig and deep, lifting bulb
keel provides spirited performance and stability that feels like a much
Knifing through the water upwind with confidence and ease, the J/70 has
that legendary “J” feel - light, controllable with a wide-groove
to sail consistently fast. With an adjustable cascading backstay, one has
total control over sail shape and dynamic rig tension across the full range
of conditions, making it not only easy to change gears on the J/70, but
faster and safer.
The soft backstay used by the J70 allows for minimal weight aloft. The Backstay
uses 6mm dyneema single braid spliced onto a low friction ring. The backstay
bridle is also a 6mm dyneema line with a sling splice and ball.
allows the backstay to be adjusted in varying wind conditions. As the wind increases,
the bridle should be tensioned to remove any excess slack. We recommend
using a bridle with a sling splice on both ends that extends to a length
Backstay Control The Backstay is controlled using a triple configuration of Harken
29mm T2 Blocks, all tied together. The line is led to the deck through
a 29mm fixed block and through a 29mm cheek block. The control line terminates
through a micro cam cleat with fairlead.
traveler system on the J70 uses a high beam 1.2m 22mm traveler track. The
recommended traveler car is a Harken Small Boat CB car with a stand up
toggle. The traveler line runs through 2 fixed 29mm carbo blocks and terminates
through a micro cam cleat with fairlead. This creates a simple 2:1 purchase
for the driver. We recommend using a light 5mm continuous line to make
breaking the leeward cleat easier.
J70 Mainsheet can be configured numerous ways, but class rules allow a
minimum purchase of 4:1 and a maximum purchase of 6:1. We recommend using
that will allow you to adjust from a 6:1 purchase to a 5:1 purchase on
the water. You will need to use a 57mm double block with a suspended 40mm
T2 loop block. Use the 5:1 purchase in light air and switch to the 6:1
purhcase when the breeze comes on. We recommend using a tapered 8mm line
for your mainsheet.
Jib trim on the J70 is one of the most critical and difficult tasks while
sailing upwind. Adding an extra cleat facing outboard to each side will
allow you to trim maintain jib trim from the rail. We recommend using
risers under the cleat to keep the sheet from slipping. The jib sheet
is rigged as a 2:1 purchase, which allows controlled sheeting of the
jib in a wide range.
For better control, we recommend splicing 2 40mm
T2 Blocks together using a single braid dyneema line. Put the line through
the clew on the sail and create a secure luggage tag hitch.
Jib Fine Tune
Jib Halyard Fine Tune on a J70 adds a crucial element to your upwind settings.
By using a 4:1 purchase, the fine tune is led through 2 40mm T2 airblocks
and 1 29mm T2 air blocks. You control the tension through a swivel cleat
attached to the mast.
With this system, the luff tension on your Jib can be adjusted quickly
through the puffs. Set your halyard at the minimum setting for the
lulls. As the breeze increases in the puffs, add tension to the luff to
in the sail, as well as give you a better angle of attack against the
wind. Constantly 'changing gears' will give you the edge you need to excel.
J70 Sailboat Parts and Equipment
We at Layline strive to be your source for J70 Sailboat Parts and Equipment and all sailboat hardware, rigging, and sailing gear. With our focus on one design and handicap racing we can offer advice and reviews of what you need to compete. If you need any assistance selecting the appropriate J70 Sailboat Parts and Equipment
please contact us. Our crew is ready to help!