Seller's Description
The J/70 Speedster (22.75 feet) is J/Boats’ first ramp-launchable, keelboat - designed to fulfill the need for an easy-to-own, high performance one-design that’s exciting to sail, stable enough for the entire family, AND easy to tow, rig, launch and sail. Since its introduction in 2012, the J/70 has become the most prolific sportboat in the world with 1500 boats sailing in 25 countries. It all started with a boat that’s a BLAST to sail!
Equipment: Hull #425 - 1 main, North Sails (in good condition) - 2 jibs, NS (one in good training condition, the other very good, only lightly used) -2 spins -Spinnaker launch bag -Suzuki 2.5 OB, serviced 5/2021 -Deck foam, grey -Triad trailer (with spare tire, titled in NC) -Keel crane (missing handle but functions with socket) -Backstay flicker -Windex -Velocitek prostart with mast bracket -Travel/deck top and bottom covers, Harken -Padded rudder bag -Tiller bag, harken -Extra bronze rudder pin -Jib sock, Harken -Over-the-boom cockpit cover, Harken -Hatch and companionway covers -Padded hatch board bag -Padded rudder bag -Fire extinguisher -Horseshoe buoy -Mooring lines -Winch handle -2x fenders -Manual bilge pump -Spare blocks, brand new (Harken 57mm carbo ratchet, 29mm carbo T2, 40mm carbo T2, 57mm carbo T2 loop, 57mm carbo fiddle, 29mm single fixed carbo block, 29mm carbo pivot lead w/ carbo cam, micro camMatic II cam cleat) -Soak Halyard clip
Specs
- Designer
- Alan Johnstone
- Builder
- J Boats
- # Built
- 1100
- Hull
- Monohull
- Keel
- Fin
- Rudder
- Transom hung
- Construction
- FG
Dimensions
- Length Overall
- 22′ 9″ / 7 m
- Waterline Length
- 20′ 5″ / 6.2 m
- Beam
- 7′ 4″ / 2.3 m
- Draft
- 4′ 9″ / 1.5 m
- Displacement
- 1,790 lb / 812 kg
- Ballast
- 630 lb / 285 kg (Lead)
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 226′² / 21 m²
- Total Sail Area
- 226′² / 21 m²
Mainsail
- Sail Area
- 123′² / 11.5 m²
- P
- 26′ 1″ / 8 m
- E
- 9′ 5″ / 2.9 m
- Air Draft
- ?
Foresail
- Sail Area
- 103′² / 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
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- ?
Calculations
- Hull Speed
-
9.1 kn
Classic: 6.06 kn
Hull Speed
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.
Formula
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
- Sail Area/Displacement
-
24.5
>20: high performance
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.
Formula
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
-
35.1
<40: less stiff, less powerful
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.
Formula
Ballast / Displacement * 100
- Displacement/Length
-
93.1
<100: Ultralight
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.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
-
9.1
<20: lightweight racing boat
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.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
-
2.4
>2.0: better suited for coastal cruising
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.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
Notes
Spinnaker (asym.) area: 491 sq.ft./45 m²
More than 1100 delivered as of 2016.
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