j 27 sailboat specs

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• By Bill Brockway
• Updated: February 8, 2002

The Rod Johnstone-designed J/27 was first introduced in 1983, and 211 hulls were built by 1992. This is one of the more affordable boats on our list, with an average price of $19,000. Racing it requires a crew of five to seven.

The J/27 sails to its rating best in light or heavy air and has some trouble competing in medium air, mostly because of the shorter waterline length. Some boats need simple upgrades to get ready for racing, such as new halyards, adjustable leads, and a new backstay. This is likely to cost approximately $2,500. A new suit of sails for a J/27 will be $7,500.

J/27 http://www.j27.org Typical monthly costs: $756 Annual budget range: $1,000 to $12,000 PHRF 17 to 129 LOA 27’6″ LWL 23′ Beam 8’6″ Draft 4’11” Disp. 3,800 lbs. SA 364 sq. ft.

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J/27 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/27. Built by J Boats and designed by Rod Johnstone, the boat was first built in 1984. It has a hull type of Fin w/transom hung rudder and LOA is 8.38. Its sail area/displacement ratio 23.98. Its auxiliary power tank, manufactured by undefined, runs on Outboard.

J/27 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/27 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, contributions, who designed the j/27.

J/27 was designed by Rod Johnstone.

Who builds J/27?

J/27 is built by J Boats.

When was J/27 first built?

J/27 was first built in 1984.

How long is J/27?

J/27 is 7.01 m in length.

What is mast height on J/27?

J/27 has a mast height of 10.06 m.

Member Boats at HarborMoor

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Mid-Range members enjoy the J/27 for daysails, overnights, and 3-Day cruises.

The J/27 combines a classic look, superb stability, and an easy to manage rig. The 8’ long cockpit seats 4 to 5 comfortably. The J/27 is the perfect weekend cruiser.

Mid-Range members can daysail and overnight the J/27’s, AND take an extended cruise of up to three days.

SPECIFICATIONS:

• LOA: 27' 6"
• DRAFT: 4' 10"
• BEAM: 8' 6"
• DISPLACEMENT: 3,800 LBS
• BALLAST: 1,530 LBS (lead keel)
• SAIL AREA: (Main + 100% jib) 364 SQ FT
• See Policies and Procedures for full equipment list
• 5 HP outboard w/3 gallon external tank
• Main, 100% jib, 135% genoa, spinnaker
• Danforth w/ 150 ft. rode
• Navigation lights
• Boston area chart and navigation equipment
• Berths for four
• Safety equipment and first aid kit

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Our 75+ boat fleet features boats from 23 to 40 feet and spans 5 distinct membership categories.

Fleet of 10. J/24’s are very popular to daysail among the harbor islands and overnights to further destinations like Plymouth and Salem.

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J/27 Reviews, Specs and more

Fast Fun Racer or Getaway Weekend Cruiser

For more J/27 Class Information- http://www.j27.org/ Introduced: 1984           Built To: Hull #189 Last Model Year: 1992     Builder: Tillotson Pearson, Inc. Strong Class Strict Rules. The J/27 Class Association, owner driven and over 190 boats strong, sail in North American, Midwinter, and Regional championships. A superb J/27 Class Newsletter keeps you up-to-date on Class activities, latest results, maintenance tips, cruising points of interest, and “go-fasts”. And the J/27 Class Rules have sail limitations to help insure equal performance and resale value. The Class supports both the active racer and cruising sailor in addition to fleets throughout the U.S.  

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Comments are closed.

The J27 is a 27.5ft fractional sloop designed by Johnstone and built in fiberglass by J Boats between 1984 and 1992.

189 units have been built..

The J27 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.

J27 for sale elsewhere on the web:

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What is a J27 Sailboat? Here’s What You Need to Know

If you are a sailing enthusiast, then you have likely heard of the popular J27 sailboat.

But you may not know much about this small sailboat’s design, features, and performance capabilities.

Whether you’re interested in cruising, racing, or just getting out on the water, this article will provide a comprehensive overview of the J27 and answer all your questions about this popular sailboat.

We’ll cover the design and construction of the J27, its features, performance capabilities, cruising and racing benefits, maintenance and upkeep requirements, and its sheer popularity among sailing enthusiasts.

Let’s dive into the world of the J27 sailboat!

Table of Contents

Short Answer

The J/27 sailboat is a 27-foot keelboat designed by Rod Johnstone and manufactured by J Boats since 1988.

It is a popular one-design racing boat with an active class association.

It is a versatile boat suitable for both club racing and cruising, and is easily handled by a small crew.

The J/27 is a speedy yet stable boat, and is well-suited for day sailing and weekend trips.

Overview of the J27 Sailboat

The J27 sailboat is a light and fast racing sailboat that has become a popular choice for both racing and cruising.

It is a 27-footer, which makes it a great size for both inshore and offshore racing.

The J27 is equipped with a full-keel, fin keel, or a modified fin keel, depending on the individual model.

This gives the boat a unique combination of speed and maneuverability that makes it a great choice for racing.

The interior of the J27 is also well-equipped, with a spacious cockpit and comfortable cabin that makes it suitable for cruising as well.

The boat is designed to be able to reach speeds of up to 10 knots, and is fitted with a powerful sail plan that allows it to make the most of its speed.

The J27 is also designed to be an easy boat to sail, with an ergonomic design that allows the crew to effortlessly and quickly adjust the trim.

This, combined with the boat’s responsive handling, makes it an exciting and versatile sailboat that is sure to provide plenty of fun and excitement on the water.

Design and Construction of the J27

The J27 sailboat is renowned for its sleek design and lightweight construction, making it the perfect choice for both racing and cruising.

The boat is 27-foot long, with a full-keel, fin keel, or modified fin keel, depending on the model.

It is also equipped with a spacious cockpit and a comfortable interior cabin.

The hull of the J27 is constructed from fiberglass and is designed to be lightweight and fast.

The boat also features a deep keel, which gives it the stability and tracking needed for racing.

The keel also helps to reduce drag, allowing the boat to reach speeds of up to 10 knots.

The deck of the boat is also designed with racing in mind, featuring non-skid surfaces and strategically placed cleats and handrails.

The cockpit is also designed to be comfortable and spacious, with plenty of room for the crew.

The interior cabin is also comfortable and well-equipped, with storage compartments, a galley, and a sleeping area.

Overall, the J27 sailboat is a great choice for anyone looking for a lightweight and fast boat that can be used for both racing and cruising.

With its sleek design and lightweight construction, the J27 is sure to provide plenty of fun and excitement on the water.

Features of the J27

The J27 sailboat is a great choice for those looking for a lightweight and fast racing or cruising sailboat.

It is 27 feet long and can reach speeds of up to 10 knots.

Depending on the model, it can be equipped with a full-keel, fin keel, or modified fin keel.

This makes it incredibly versatile, allowing it to navigate inshore and offshore waters with ease.

The J27 also features a spacious cockpit, making it an ideal choice for those who want to entertain guests while out on the water.

The interior cabin is also comfortable, providing plenty of room for overnight stays or other extended trips.

The boat is also equipped with a number of safety features, such as life jackets, flares, and a fire extinguisher.

In addition to its speed and size, the J27 also features a range of sailing features that make it an ideal choice for racing.

It has a large mainsail and a genoa, as well as a spinnaker for downwind sailing.

It also has adjustable backstays that allow for fine-tuning of the sail trim.

This makes the J27 a great choice for those looking to race competitively or just enjoy a relaxing day out on the water.

Overall, the J27 sailboat is a great choice for those looking for a versatile and exciting sailboat.

It is equipped with plenty of features that make it ideal for both racing and cruising, and its size and speed make it a great choice for both inshore and offshore waters.

Whether you’re looking for a competitive edge or just a fun day out on the water, the J27 sailboat is sure to provide plenty of fun and excitement.

Performance Capabilities of the J27

The J27 sailboat is a light and fast racing sailboat, capable of reaching speeds of up to 10 knots.

The sleek 27-footer is designed for racing in both inshore and offshore waters, making it an excellent choice for those looking to get the most out of their sailing experience.

The boat is equipped with a full-keel, fin keel, or modified fin keel, depending on the individual model.

This allows the boat to be nimble and responsive in all kinds of conditions.

The full-keel provides stability and tracking, while the fin keel allows for better maneuverability.

The modified fin keel is a combination of both, allowing for a balance of stability and performance.

The J27 is also equipped with a spacious cockpit and a comfortable interior cabin, making it a great choice for cruising as well as racing.

The J27 is designed for performance, and its sailing capabilities are unmatched.

The boat is capable of reaching speeds of up to 10 knots, which is impressive for its size.

The full-keel, fin keel, or modified fin keel provide stability and maneuverability, allowing the boat to perform well in a variety of conditions.

Additionally, the spacious cockpit and comfortable interior cabin make it a great choice for cruising as well as racing.

The J27 is an incredibly versatile boat, and its performance capabilities make it a great choice for both novice and experienced sailors alike.

Cruising and Racing Benefits of the J27

The J27 sailboat is the perfect choice for those who are looking for a light and fast boat for both cruising and racing.

The sleek 27-footer is designed to reach speeds of up to 10 knots, making it a great choice for inshore and offshore racing.

The J27 is equipped with either a full-keel, fin keel, or modified fin keel, depending on the individual model, providing the perfect balance of stability and performance.

The spacious cockpit and comfortable interior cabin make the J27 a great choice for cruising as well.

The boat is designed to accommodate up to six passengers, making it a great choice for family trips or weekend getaways.

The interior cabin is equipped with everything you need for a comfortable cruise, including a galley, head, and plenty of storage space.

The J27 sailboat is also perfect for those who love to race.

The boat is designed with a deep draft hull which helps it slice through the waves for a smoother ride and offers excellent control in varying wind conditions.

The boat also comes equipped with a full sail plan, providing plenty of options for customization to suit the individual racers needs.

The J27 is an exciting and versatile sailboat that is sure to provide plenty of fun and excitement on the water.

Whether youre looking for a fast and agile racing boat or a comfortable and enjoyable cruiser, the J27 sailboat has it all.

Maintenance and Upkeep Requirements

The J27 sailboat is a great choice for racing, cruising, or both.

With its light and fast design, it can reach speeds of up to 10 knots, making it great for inshore and offshore racing.

However, like all boats, maintenance and upkeep are required to keep it running smoothly.

The J27s hull needs to be kept clean and free of barnacles and other marine growth.

Regularly cleaning the hull and applying antifouling paint will help to keep the boat running smoothly and reduce drag.

It is also important to regularly inspect the boat for signs of wear and tear, and make any necessary repairs.

The sails and rigging should also be checked regularly for wear and tear.

Sails need to be stored properly and inspected for any damage or worn spots.

The rigging should also be checked for any loose fittings or chafing.

Regularly greasing and lubricating the winches will help to keep them running smoothly.

The engine should be checked and serviced regularly to make sure it is running correctly.

The fuel tanks should also be checked for any water contamination and the fuel filters changed regularly.

The engine compartment should also be inspected for any signs of corrosion or water damage.

Finally, the interior of the boat should be kept clean and well-maintained.

The cushions should be vacuumed and cleaned regularly and any signs of mold or mildew should be treated immediately.

The boat should also be checked for any signs of water damage or leaks.

By following these maintenance and upkeep requirements, the J27 sailboat will remain in good working condition and provide many years of sailing pleasure.

Popularity of the J27

The J27 sailboat is a popular choice among sailors of all skill levels, from experienced racers to weekend cruisers.

This is due to its light weight, speed, and versatility, as well as its comfortable interior cabin and spacious cockpit.

The J27 is known for being a great boat for inshore and offshore racing, as well as for cruising.

It is a great choice for those looking for a fast and fun sailboat that can handle a variety of conditions.

The J27 is also popular among sailors for its range of keel types.

Depending on the individual model, the J27 can come with a full-keel, fin keel, or modified fin keel.

This allows sailors to choose the keel that best suits their needs and preferences.

The full-keel provides additional stability and allows the boat to sail more efficiently in light wind conditions.

The fin keel and modified fin keel are designed to be more responsive and maneuverable in higher wind conditions.

The popularity of the J27 sailboat is also due to the fact that it is easy to find parts and accessories.

With so many J27s on the water, there is an abundance of aftermarket parts and accessories available, making it easy to keep your boat running in peak condition.

In conclusion, the J27 sailboat is a popular choice for a variety of reasons.

It is light, fast, and versatile, making it suitable for inshore and offshore racing as well as cruising.

It is also easy to find parts and accessories for the J27, ensuring that it is always running in peak condition.

Whether you are an experienced racer or a weekend cruiser, the J27 is a great choice for anyone looking for a fast and fun sailboat.

Final Thoughts

The J27 sailboat is a fast and light racing sailboat that is versatile enough for both racing and cruising.

With a full-keel, fin keel, or modified fin keel, spacious cockpit, and comfortable interior cabin, this 27-footer is a great choice for any sailing enthusiast.

The J27 is sure to provide plenty of fun and excitement on the water, making it a popular choice among sailors.

So if you’re looking for a fast and exciting sailboat that can offer you the best of both worlds, the J27 should definitely be on your list.

James Frami

At the age of 15, he and four other friends from his neighborhood constructed their first boat. He has been sailing for almost 30 years and has a wealth of knowledge that he wants to share with others.

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Rig Set up & Tuning

Mast/Rig tuning is one of the important speed/point factors, for two reasons:

• The prebend in the mast has to be synchronized with the luff curve cut into the main, nothing is slower than getting this wrong
• You want as much sag in the headstay as is reasonable for the wind conditions you normally sail in, plus some flexibility thereafter

Initial Setup and Tuning

JBoats provides a good initial rig setup and tuning guide .

Don't under estimate the effects of rig tune. When we first got the boat we used the tuning advice from the jboats website and also from ullman sails. We later found out from some experienced J/27 racers that those rig tensions were too tight, especially for light air. Loosening the uppers and lowers to 900 lbs in light air transformed the boat and made the difference between winning and losing. The tuning style we use is from Doyle sails. Its also an easy way to tune as you set to a base setting, then from their you only adjust forestay length for different conditions. Here it is if anyone is interested:

This is your base setting from 0 to 10 knots:

• Base Forestay length: 31' 6"
• Base Rig Tensions: uppers 900 lbs, lowers 900 lbs, int. hand tight

From here, we adjust the forestay from base as follows:

• 11-14 knots: Tighten 1/2" (approx. 6 to 8 full turns)
• 15 knots +: Tighten 1 1/2" (approx 18 full turns)

The J/27 is one of the most sensitive upwind boats I've ever sailed. Your forestay sag and rake have to be spot on for different wind conditions or you are toast.

The even (upper and lower with intermediates hand tight) shroud tensions originated with Chris Princing back in 1997 or so, when he was using Doyle sails from Newport RI. He also originated the zero prebend main tune for J/27's, which works very well with the even shroud tensions. This Banks/Doyle tuning guide can be found here Banks Tuning Guide (requires access to the J27 Yahoo! group website)

Additional Suggestions

The objective is to use the headstay sag in light air and to start using the backstay above 10-12 knots (depending on crew weight, sea state, etc.) to reduce the sag and flatten the main and the Cunningham to bring the draft forward.

Preparation

• Drill sufficient holes in the beam that the mast butt sits on so that the luff curve can be adjusted from 4” to zero inches – a range of 6” adjustments in 1” steps
• A reasonably long headstay, 31’ 5” – 31’ 7” pin-to-pin is necessary to get sufficient headstay sag with reasonable shroud tension
• Undo all of the turnbuckles so that they are loose
• Use a car jack with a piece of 2x4 as a load spreader to support the mast against the front bulkhead, since even with the shrouds loose the mast will want to move forward.
• Assuming approximately even final tension on upper and lower shrouds between 800 and 1000lbs for a deep luff curve main (3.5 – 4.0”) try about 6.5” from the rear bulkhead
• For a zero luff main try about 9” from the rear bulkhead.
• This will depend, in part on the stiffness of the mast
• Ease the mast forward or jack backwards to the desired position. Make sure the butt plate is even on the mast seat from side to side, then tighten the bolts, let mast run as far forward as possible against the bolts before final tighten.
• Leaving the intermediates loose, tighten the uppers and lowers until taut then put in even tension, approximately 600 lbs on both uppers and lowers.
• Next, determine if the mast is straight by using a heavy weight (full 3 gallon gas can or heavy tool box is fine) or calibrated spring at the end of the genoa halyard (the mast halyard would be better but since there are no supports above the uppers the tip always wants to move around a lot)
• Repeat 3-4 times
• Mark the halyard where it intersects the toe rail, you can use a small straight edge set on top of the toe rail and butted against the shrouds as a marker point
• Move the halyard/weight over to the starboard side, making sure you keep a little tension as you move it across the boat and that you do not get it snagged on a spreader, halyard, headstay, etc. and repeat
• If the mark from the port side is above the starboard toe rail then the mast is canted to port and you follow the procedure below, if it is below then it is canted to starboard in reverse the procedure
• Adjust the starboard turnbuckle until the mark is about half way between the initial measurement and the port side mark
• Mark the halyard at the toe rail and move it back to port
• Repeat on both sides until you have a mark on both sides that is even – your mast is now centered!
• CHECK IT AGAIN
• Put the wedges in to secure the mast collar making sure that the back of the mast is hard against the back of the collar
• On the uppers do no more than 2 turns at a time each side
• On the lowers do no more than 1 turn at a time each side since they are so short
• Adjust the uppers to about 850 lbs
• Tension the lowers, keeping the mast in column, to about 850 lbs – at this point each half turn will add about 100 lbs
• Check and record all tensions
• Sight up the luff track in the mast to make sure it is in column, if not straight adjust the lowers as necessary
• Hand tension the intermediates, constantly checking for straightness
• Measure prebend using a piece of card on the main halyard stretched tight making sure to deduct the distance the masthead sheave sticks out
• If it looks right put up main and go sailing
• If it looks wrong start again

The whole process should take about 2 hours

Contributors

• Balance Act

Review of J/27

Basic specs., 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 6.4 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/27 is about 121 kg/cm, alternatively 681 lbs/inch. Meaning: if you load 121 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 681 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.

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

We are always looking for new photos. If you can contribute with photos for J/27 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

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• Sailboat Guide

1986 J Boats J/27

• Description

Seller's Description

J/27 Highly upgraded and modernized race boat ready to go! SWYC San Diego, CA.

Equipment: UPGRADES: New race bottom. Long boarded/keel templated. Faired with Carbon hardened bottom paint 12/22. Mast pulled, stripped and treated. New carbon fiber spreaders, carbon fiber flicker, all new standing rigging 01/22. Modernized backstay 02/22. All new race dynema running rigging01/22. New Doyle race mainsail 03/22. New Doyle light #1 genoa 03/22. New Doyle spinnaker S1 03/22. New Doyle #3 03/22. New S2 ordered, coming soon. Available and negotiable. Full set of older race sails for practice/cruising. Roller furler removed but will come with the boat and has a roller genoa on it. North delivery cruising main 2020. Rebuilt/upgraded spinnaker pole 02/23. New boom kicker. Fresh engine service. Winches rebuilt/serviced 12/22

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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