The J36 is a 35.95ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1981 and 1984.
55 units have been built..
The J36 is a light sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat. The fuel capacity is originally small. There is a very short water supply range.
J36 for sale elsewhere on the web:
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Review of J/36
Basic specs..
The boat is typically equipped with an inboard Yanmar diesel engine.
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 7.4 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for J/36 is about 224 kg/cm, alternatively 1256 lbs/inch. Meaning: if you load 224 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1256 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is L/B (Length Beam Ratio)?
Maintenance
Are your sails worn out? You might find your next sail here: Sails for Sale
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
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J/36 Detailed Review
If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of J/36. Built by J Boats and designed by Rod Johnstone, the boat was first built in 1981. It has a hull type of Fin w/spade rudder and LOA is 10.96. Its sail area/displacement ratio 22.07. Its auxiliary power tank, manufactured by Yanmar, runs on Diesel.
J/36 has retained its value as a result of superior building, a solid reputation, and a devoted owner base. Read on to find out more about J/36 and decide if it is a fit for your boating needs.
Boat Information
Boat specifications, sail boat calculation, rig and sail specs, auxillary power tank, accomodations, contributions, who designed the j/36.
J/36 was designed by Rod Johnstone.
Who builds J/36?
J/36 is built by J Boats.
When was J/36 first built?
J/36 was first built in 1981.
How long is J/36?
J/36 is 9.3 m in length.
What is mast height on J/36?
J/36 has a mast height of 14.33 m.
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- Sailboat Guide
1981 Johnstone Boats J-36
- Description
Seller's Description
With a PHRF 84 rating, the design concept of the J/36 is similar to J/Boat’s other successful models (like the J/35) with low freeboard, wide decks for effective hiking and interior volume, a high aspect fractional rig, low wetted surface, and long effective sailing length. With a compact galley and enclosed head, the large main saloon with teak interior provides significant volume from an 11.76’ beam and 6’1” headroom. Shrouds are rod rigging, head-foil, covers for both mainsail and wheel, winches all disassembled cleaned and greased, and nearly new settee cushions. Recently installed ‘V’ berth, 13 bags of sails, Yanmar diesel, Garmin chart plotter, large leather wrapped wheel and 2021 bottom paint. Last year lots of labor on the boat leading up to a 2-week trip to the San Juans which resulted in our choice this year to sell and move on to a larger boat. It does need continuing attention on a few projects to remain in functional condition
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)
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Sail area calculations
Mainsail Area = P x E / 2 Headsail Area = (Luff x LP) / 2 (LP = shortest distance between clew and Luff) Genoa Area 150% = ( 1.5 x J x I ) / 2 Genoa Area 135% = ( 1.35 x J x I ) / 2 Fore-triangle 100% = ( I x J ) / 2 Spinnaker Area = 1.8 x J x I
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COMMENTS
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.
The J36 is a 35.95ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1981 and 1984. 55 units have been built. The J36 is a light sailboat which is a very high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat. The fuel capacity is originally ...
J/36 Technical specifications & dimensions- including layouts, sailplan and hull profile.
The Performance Racer-Cruiser the Family Can Enjoy. The J/36 was originally conceived and designed to compete without regards to any handicap rule that was popular in the 1970's and 1980's. It's primary goal was to have a fast, fun, enjoyable boat to sail that the family could enjoy. Since then the J/36 has enjoyed success racing under the PHRF ...
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
Immersion rate. The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for J/36 is about 224 kg/cm, alternatively 1256 lbs/inch. Meaning: if you load 224 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1256 lbs cargo on the boat it will sink 1 inch.
1 of 1. If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of J/36. Built by J Boats and designed by Rod Johnstone, the boat was first built in 1981. It has a hull type of Fin w/spade rudder and LOA is 10.96. Its sail area/displacement ratio 22.07.
Here in the PNW the 35 rates 72, the 36 rates 79. The 36 was a tough boat to beat in Vic-Maui races, although that might have been a rating thing. We raced Vic-Maui against one in 2000 and they gave us fits - they ran off 230 miles one day chasing squalls. ... I think the J36 would be a fine shorthanded boat. Not as great upwind compared to the ...
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 Beam 1.33) D: Displacement of the boat in pounds; LWL: Waterline length in feet; LOA: Length ...
Seller's Description. 1981-J36, Quest, located in Squalicum Harbor, Bellingham, WA. Newer 3GM Yanmar water cooled motor, professional racing bottom and foils (2018), rigging, turn buckles and solid wire stays (2017), full length mainsail track (2017), Ray Marine Instruments (2021), masthead wand (2021), bilge pump (2022).
1980 J Boats J36 / SL . This J sailboat has a hull made of fiberglass and has an overall length of 36 feet. The beam (or width) of this craft is 120 inches. This sailboat is rigged as a Sloop. The sail area for the boat is 635 square feet. Approximate displacement for the vessel comes in at around 10600 pounds.
J/Boats is the world leader in high-performance sailboats. Designed for cruising, day sailing, offshore racing and one design racing. SEARCH J/BOATS. Search. Search. Search For: All words Any word Exact Phrase Phrase Prefix Wildcard Fuzzy query
Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ...
Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ...
44' Bruce Roberts Mauritius 43/44Honolulu, HawaiiAsking $68,899. 32' Westsail 32 Kendall. Puerto Vallarta. Asking $45,000. 24' Corsair Dash 750 MKII. Sadler Point Marina Jacksonville, Florida. Asking $66,200. 12' RS Sailing Feva XL.
Seller's Description. With a PHRF 84 rating, the design concept of the J/36 is similar to J/Boat's other successful models (like the J/35) with low freeboard, wide decks for effective hiking and interior volume, a high aspect fractional rig, low wetted surface, and long effective sailing length. With a compact galley and enclosed head, the ...
Complete Sail Plan Data for the J 36 Sail Data. Sailrite offers free rig and sail dimensions with featured products and canvas kits that fit the boat.
J Boats. There are presently 148 yachts for sale on YachtWorld for J Boats. This assortment encompasses 17 brand-new vessels and 131 pre-owned yachts, all of which are listed by knowledgeable boat and yacht brokers predominantly in United States, United Kingdom, France, Canada and Greece. The selection of models featured on YachtWorld spans a ...
Sailboat Rigging . S ailboat rigging on a sailboat is the collection of apparatuses through which the force of the wind is transferred to the ship, in order to propel it forward. The term rigging consists of a group of mechanical sailing apparatus, that are attached to the sailboat's hull in order to move the boat as a whole.
Kelsall Sailing Performance (KSP): Another measure of relative speed potential of a boat. It takes into consideration "reported" sail area, displacement and length at waterline. The higher the number the faster speed prediction for the boat. A cat with a number 0.6 is likely to sail 6kts in 10kts wind, a cat with a number of 0.7 is likely ...
J/Boats is the world leader in high-performance sailboats- designed for cruising, day sailing, offshore racing, one-design racing. SEARCH J/BOATS. Search. Search. Search For: All words Any word Exact Phrase Phrase Prefix Wildcard Fuzzy query - - - - - - . Order by: Relevance Newest First Oldest First ...
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The 36 became known as the CS 36 Traditional when the CS Merlin was introduced in 1987. Production of the two 36 footers, overlapped for nearly a year. Diesel engines varied from the original Westerbeke 30-hp, to a 33-hp Mitsubishi and later, a 28-hp Volvo. SHOAL DRAFT VERSION: Draft: 4.92'/ 1.50m. Displacement: 15650 lbs./7099 kgs.