Seller's Description
1998 J/120 Boat is setup for offshore racing having just completed the Newport to Bermuda Race. Successful race record with overall wins in the 2023 Annapolis to Newport race, 2022 Around Long Island regatta and J/120 class win in the 2021 Annapolis to Newport race. Also is a great coastal cruiser having cruised from the Chesapeake to MidCoast Maine.
Equipment: Mechanical: Westerbeke 42B4 diesel new engine mounts 2022
Rigging: New rod rigging in 2020 Carbon Mast and boom painted awlgrip black 2024 New running rigging 2023
Electronics: B&G H5000 Processor 2023 Triton 2 displays 2020 Garmin 120 displays on mast 2022 A T Mast head unit 2023 B&G P9 compass, ZG100 GPS unit 2024 Vulcan chartplotter at nav desk Vesper xb8000 AIS Actisense NGT-1 Network interface Firefly carbon foam batteries 2021 New AGM engine battery 2024
Canvas: Cockpit cushions 2021 Custom v berth mattress 2021 New dodger 2020 New sailcover 2023
Sails: Extensive sail wardrobe for offshore racing: Quantum main 2021 Quantum AP1 2021 Quantum light #1 2022 North HVY#1 2011 Quantum #3 2022 Z sails #3 UK #4 Older but little use Quantum Spin. Staysail 2021 Quantum Jibtop 2023 Quantum Code Zero 2014 North A1 2011 North A2 2011 Quantum A2 2022 Quantum A2.5 2023 Quantum A3 2021 North AP 1.5oz Older Storm jib Storm trysail
Specs
- Designer
- Rod Johnstone
- Builder
- J Boats
- Association
- J/120 Class
- # Built
- 230
- Hull
- Monohull
- Keel
- Fin + Bulb
- Rudder
- Spade
- Construction
- FG
Dimensions
- Length Overall
- 39′ 11″ / 12.2 m
- Waterline Length
- 34′ 6″ / 10.5 m
- Beam
- 12′ 0″ / 3.7 m
- Draft
- 6′ 11″ / 2.1 m
- Displacement
- 13,900 lb / 6,305 kg
- Ballast
- 6,000 lb / 2,722 kg (Lead)
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 780′² / 72.5 m²
- Total Sail Area
- 780′² / 72.5 m²
Mainsail
- Sail Area
- 414′² / 38.5 m²
- P
- 46′ 5″ / 14.2 m
- E
- 17′ 9″ / 5.4 m
- Air Draft
- 56′ 9″ / 17.3 m
Foresail
- Sail Area
- 366′² / 34 m²
- I
- 50′ 5″ / 15.4 m
- J
- 14′ 6″ / 4.4 m
- Forestay Length
- 52′ 6″ / 16 m
Spinnaker
- SPL/TPS
- ?
- ISP
- 52′ 0″ / 15.9 m
Auxilary Power
- Make
- Yanmar
- Model
- 3JH2E
- HP
- 38
- Fuel Type
- Diesel
- Fuel Capacity
- 27 gal / 102 l
- Engine Hours
- ?
Accomodations
- Water Capacity
- 75 gal / 284 l
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 2
Calculations
- Hull Speed
-
10.2 kn
Classic: 7.87 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
-
21.6
>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
-
43.2
>40: stiffer, more 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
-
150.9
100-200: light
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
-
21.5
20-30: coastal cruiser
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
-
2.0
>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
Some were finished in France.
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