Sailboat specifications
- Last update: 13rd March 2020
J/70's main features
- 2013: European Yacht of the Year: Special Yacht
J/70's main dimensions
J/70's rig and sails, j/70's performances, j/70's auxiliary engine, j/70's accommodations and layout.
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J-70 Boat Reviews
Boat Review Date: October 2014 Author: Mike Brown Overview
There is a steadily growing number of sports boats on the Swan; sail craft around six metres long, essentially big racing dinghies with ballast keels. Terrific fun, but needing athletic dinghy-style crews to sail them well. And they are purely racing boats where most racing is done by keel boats that have other careers as cruisers. A new entrant to the scene goes some way to bridge the gap.
The J70 is the latest product of the builder that gave the world the extremely successful J24, so it has a respected pedigree. A shade under the seven metres suggested by its name, it combines 21 square metres of working sail area with a displacement of 794 kilos. 36 percent of that is ballast on the end of a 1.45m keel; these are figures that suggest an easily driven, stable and fast boat. A clue to the easily driven nature of the J70 was provided by the choice of auxiliary power: a 2.5hp Suzuki that was far from working hard when called into use.
WA’s first J70 had its maiden voyage on Fremantle Sailing Club’s opening day, with everything new to its crew. It was launched off a trailer, its lifting keel making this possible and simple. The routine of lowering and securing the keel, stepping the featherweight carbon fibre mast, tensioning the standing rigging and bending on the sails was quickly mastered. The routine is so straightforward it could probably be achieved in 20 minutes if money were at stake.
Winds on the day were flukey, with some respectable gusts. As soon as anything near ten knots cropped up the J70 was up and boogying, impersonating a lightweight dinghy. The crew for the day comprised four sizeable males, adding substantially to the displacement. The performance suggested adjusting crew numbers to wind strength would be a useful ploy.
It is illuminating to do a few sums on displacement and sail area with a lightweight vessel like this. We have all seen the pictures of seriously large racers with a dozen or more crew members sitting on the weather rail as organic ballast. Compare their vast sail area with the J70’s and see how much more affect a couple of 80 kilo people sitting on the J’s rail has. And the J70 has the shape and equipment to make this a natural and comfortable position.
But the J70 can have a life away from racing. Overseas, where this is a runaway big selling boat, it is a popular family or married couple craft for weekend fun with the occasional race. Loners can enjoy single handing in it. For the most social and laid back racing – twilights – the cockpit can accommodate eight or more as well as the esky.
The small fore cabin has V-berths long enough for use by humans, and weekending is very much an option. Overseas experience says a big use of the cabin is for children, sated with sailing, who can migrate there to play with electronic toys rather than asking if they are there yet.
The layout is uncomplicated allowing single handing; from one position the skipper can control the adjustable backstay, main and jib sheets. Extending the bowsprit and setting the asymmetric spinnaker, though, will call for few more hands. There is a pair of sheet winches that are likely only to get much use in stronger winds. These and all the other hardware are satisfyingly beefy items, well up to their jobs.
So far there is just the one J70 afloat in WA, but more were ordered at the Mandurah show. If overseas experience is any guide there should soon be enough here for one-design racing. The worldwide numbers grew so fast that less than 18 months after launching the International Sailing Federation approved the J70 as an ISAF class. The first world championship was held last month the entries capped at 120.
Price from $66,000
Length overall 6.93m
Beam 2.25m
Draught 1.45m
Displacement 794kg
Ballast 286kg
Sail area 21sqm
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- Sailboat Guide
J/70 is a 22 ′ 8 ″ / 6.9 m monohull sailboat designed by Alan Johnstone and built by J Boats starting in 2012.
Rig and Sails
Auxilary power, accomodations, calculations.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64) 2/3
- SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D : Displacement in pounds.
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Spinnaker (asym.) area: 491 sq.ft./45 m² More than 1100 delivered as of 2016.
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A boat with a BN of 1.6 or greater is a boat that will be reefed often in offshore cruising. Derek Harvey, "Multihulls for Cruising and Racing", International Marine, Camden, Maine, 1991, states that a BN of 1 is generally accepted as the dividing line between so-called slow and fast multihulls.
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Sailboat specifications. Last update: 13rd March 2020. The J/70 is a 22'8" (6.93m) one design sailboat designed by Alan Johnstone (United States). She is built since 2012 by J/Boats (United States). She has been awarded " 2013 - European Yacht of the Year: Special Yacht ".
The J70 is the latest product of the builder that gave the world the extremely successful J24, so it has a respected pedigree. A shade under the seven metres suggested by its name, it combines 21 square metres of working sail area with a displacement of 794 kilos. 36 percent of that is ballast on the end of a 1.45m keel; these are figures that ...
J70 preowned sailboats for sale by owner. J70 used sailboats for sale by owner.
The J/70 sailboat has a respected pedigree and is the product of a shipyard that has already given us the very successful J/24. The length of the new racer under seven meters combines 21 m² of sail area with a displacement of 794 kg - 36% of this weight is ballast at the end of the 1.5-meter keel.
The higher a boat's D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. ... 2015 J Boats J70 $40,000 USD. Have a sailboat to sell? List it for free and it will show up here. Advertisement ...
The J/70 Speedster is J/Boats' first fully ramp-launchable, keelboat first launched in 2012. She was designed to fulfil a growing need for an easy-to-own, hi...
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