international 420 sailboat

Accelerate skill development in a boat that delivers an edge.

A Mackay 420 has been behind nearly every world champion success since we commenced building 420’s in 2012.

Specifications

Hull Length                            4.2 m

Beam Length                        1.63 m

Mainsail Area                       7.4 m2

Headsail Area                       2.8 m2

Spinnaker Area                    9.0 m2

Boat Weight                          100 kg

Hull Weight                           80 kg

Hull Material                         GRP

No. of Crew                           2

Opt Crew Weight                 110 - 145 kg

Number of Trapeze             Single

Designer                                 Christian Maury

420 Class Association website:  http://www.420sailing.org/

The 420 is one of the best options to learn the ropes about two-person dinghy sailing. Crews learn how to tune a boat, set up control systems, trim sail combinations (jib, main and spinnaker together), work on downwind and upwind techniques, and importantly, learn how to work with another crew.

The Class has attracted many top sailors to it, providing a learning platform that has led them into successful Olympic campaigns and big boat careers.  

The 420’s design and class rules gave us the opportunity to build a boat similar to how the Mackay 470 is built in terms of the mould structure and look of the boat. 

The Mackay 420 hull shape was developed by naval architect Kevin Trotter. Kevin has designed very fast dinghies here in New Zealand over the years. Using the latest design and analysis software, along with the luxury of time we were able to evaluate the expected performance along with the look of the boat. 

Looking at where crews tended to sit in the boat in different conditions affected where we pushed the displacement curve of the boat.   Additionally, Kevin's skiff designs gave valuable insight into the way the rocker curve and buttocks lines should run through the middle and aft sections.

The hull is made from a polyester e-glass fibre, using foam core ribs and core mat panels.

The Mackay 420 deck to hull joint system is the same as our 470s, which allows for the same exceptionally strong but light gunwale arrangement. This extends around the bow and across the transom.

We have also borrowed some other features off the 470.  As an example, the way the mast partner is fitted to the deck after the boat is built allows the bulkhead in front of the mast to be more vertical and closer to the mast.  This is better for rig tension and weight distribution.  It also improves the look of the boat giving it a longer foredeck. 

The rudder stock is in cast aluminum which provides excellent support. The foils are built in the same way as our 470 foils by resin infusion.  

Most importantly the time and energy we put into the rudder and centreboard design along with the finishing of the moulds has resulted in some very special foils.

420: Our recent successes

420 Mackay Boats History

How to do a gelcoat repair.

Small gel coat repairs are relatively easy to do. 

What is Gelcoat made up of?

Gelcoat is a polyester product that is cured by using a catalyst called MEKP. (Methyl Ethyl Ketone Peroxide)

MEKP is a dangerous substance and should be treated as such when using, being very careful not to get any on your skin or in your eyes.

How can I get the catalyst - MERK?

We cannot ship MEKP so you will always need to buy it separately from your local marine store or fibreglass manufacturer.

How much MERK do I need?

The amount of Catalyst varies depending on the conditions you are using it in, but around 2%-3% will always work.

It is best to use a small syringe or dropper to get the required catalyst rate.

If you have mixed 100gm of gelcoat, then you are aiming for 2ml of catalyst.

What are the Gelcoat colours?

Gelcoats colours are not always a 100% perfect match.

Colour will vary depending on the depth of the repair and the batch.

470, 420, 29er & Starling are built from polyester resin.

For Polyester boats

470  White-  LS30    White PA 337

470  Grey- Grey RAL 7035

Blue = is supplier by Nuplex who have their own code which is not an international code

Does Mackay Boats supply gelcoat?

We supply a small tin (of each relevant colour) with each new boat.

Order additional gelcoat from our store, although it cannot be shipped by courier.

How do I do gelcoat repairs?

Doing gelcoat repairs is an art that improves with experience.

Making sure the surface is prepared well and keyed up is critical.

Overfill and then sanding back is a slow and time-consuming process.

Be very careful not to scratch the boat around the repair.

You shouldn’t sand the original surface around the repair with any paper coarser than 600grit.

Mask around the repair to protect the boat.

You can initially use a file or 150g to take the high parts off the filling, but don't use the coarse paper for too long or you will end up with scratches in the finished repair.

Once you have it fair with 600g, you can work your way through the sandpaper grades until you finish with 1500grit before cutting and polishing.

We would typically use 600g, then 800g or 1000g, then 1200g, then finally 1500g.

What can be customised?

Deck colour and non-skid on the side-decks. You can find these options if you try the boat configurator on our website.

What colour options do you offer?

White, Light Grey, Light Blue, Light Green, and Cream. On the 420, Grey is the most popular, with Blue and White equal second most popular.

How do you fit a mylar gasket the hull?

 Please watch this short video that demonstrates fitting a mylar gasket to the 420 hull - 

>> Fitting a mylar gasket .

420 Tuning Tips

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International 420 Class Association

Class contact information.

Click below

Class Email

Class Website

One-Design Class Type: Dinghy

Was this boat built to be sailed by youth or adults? Youth

Approximately how many class members do you have? 150 in the US.

Photo Credit:Michael Rudnick

Photo Credit: Michael Rudnick

About International 420 Class Association

The US International 420 Class Association is dedicated to the support, development and growth of International 420 Class sailors in the United The International 420 is an established performance two-person trapeze and spinnaker racing dinghy. The I420 is a youth development boat in 43 countries and is the boat used for the two-person boys dinghy, and two-person girls dinghy events at the Youth Sailing World Championships, the pinnacle youth sailing event in the world. In the US the boat is used in the US Sailing Youth Championship, the pinnacle youth sailing event in the US. The I420 is sailed at yacht clubs, open, national and international levels. There are many second hand boats available, and active fleets across the United States. The 2018 World Championship was held in Newport, RI with 500 sailors from over 25 counties attending.

Designed by Christian Maury in France in 1960, the I420 celebrated its 60th Anniversary in 2020. The I420 is recognized by World Sailing as an “World Sailing Learn to Sail Training Program Recommended Boat”, which endorses its use by Member National Authorities for developing and teaching sailing. All boats recognised by World Sailing have been independently assessed by World Sailing to be ideal for developing and/or teaching sailing within the World Sailing Learn to Sail programme. The class is managed at a global level by the International 420 Class Association, and by the local class association in each country. In the US that is the US I420 Class Association.

Boats Produced: 26,000

Class boat builder(s):

Full list at: http://www.420sailing.org/content/420-licensed-builders

Approximately how many boats are in the USA/North America? 150

Where is your One-Design class typically sailed in the USA? List regions of the country:

New England (Newport, CT, NYC, NJ), Annapolis, Miami, Houston, San Francisco & Southern Califorina.

Does this class have a spinnaker or gennaker? Yes

How many people sail as a crew including the helm?  2

Ideal combined weight of range of crew:  250 – 325 lbs

Boat Designed in  1960

Length (feet/inches): 13′ 9″

Beam: 5′ 4″

Weight of rigged boat without sails: 100 kg/220 lbs (80kg/176 lbs Bare Hull)

Mast Height: 20′ 6″

Tuning Guides

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• 420 Sailboats: Exploring the Thrill of Dinghy Sailing

Sailing has been an adventurous and captivating water activity enjoyed by enthusiasts around the world for centuries. Among the various sailing boats, the 420 sailboat stands out as a popular choice for dinghy sailing. In this article, we will delve into the exciting world of 420 sailboats, understand what makes them unique, explore different sailing dinghy types, and discover the thrill of dinghy cruising. So, hoist the sails and let's embark on this thrilling journey!

What are 420 Sailboats?

1.1 the origins of the 420 sailboat.

The 420 sailboat originated in France in the late 1950s as a two-person dinghy designed for competitive racing. Its design was based on the popularity of the larger 470 sailboat and was intended to create a more accessible racing boat for young sailors.

1.2 Design and Characteristics

The 420 sailboat typically measures around 4.2 meters (13 feet 9 inches) in length, featuring a single trapeze, a mainsail, and a jib. The boat's hull is often made of fiberglass, ensuring durability and performance on the water.

1.3 Sailing Community and Competitions

Over the years, the 420 sailboat has garnered a strong global following, becoming one of the most popular dinghies for youth and amateur sailors. The boat's versatility allows both beginners and experienced sailors to enjoy thrilling competitions and hone their skills.

The Fascination of Dinghy Sailing

2.1 understanding dinghy sailing.

Dinghy sailing involves sailing small boats, often single-handedly or with a crew of one or two. It offers a more intimate connection with the water, providing sailors with an immersive experience of being one with the elements.

2.2 Advantages of Dinghy Sailing

Dinghy sailing offers several advantages, such as affordability, portability, and maneuverability. Sailors can easily transport and launch dinghies, allowing them to explore various water bodies and remote sailing destinations.

2.3 Challenges and Skills Required

While dinghy sailing is exhilarating, it requires a certain level of skill and adaptability. Sailors must learn to handle the boat in changing weather conditions and use their body weight to maintain stability.

Exploring Dinghy Cruising

3.1 escaping to serene waters.

Dinghy cruising offers a unique opportunity to explore secluded coves, tranquil lakes, and winding rivers. Sailors can escape the bustling city life and immerse themselves in the serenity of nature.

3.2 Navigating the Seas with Confidence

Before embarking on a dinghy cruise, sailors must acquaint themselves with navigation skills, weather patterns, and safety procedures. Proper planning and preparation are essential for a safe and enjoyable journey.

3.3 Preparing for a Dinghy Cruise

Preparing for a dinghy cruise involves packing essential supplies, inspecting the boat's condition, and ensuring all safety equipment is onboard. Additionally, sailors should inform someone about their sailing plans for added security.

Different Types of Sailing Dinghies

4.1 traditional sailing dinghies.

Traditional sailing dinghies often have classic designs and are cherished for their historical significance. They offer a nostalgic sailing experience, appealing to enthusiasts looking to reconnect with the past.

4.2 Modern Performance Dinghies

Modern performance dinghies, like the 420 sailboat, are designed for optimal speed and maneuverability. They are favored by competitive sailors and those seeking an adrenaline-fueled sailing experience.

4.3 Choosing the Right Dinghy for You

When selecting a sailing dinghy, consider your sailing goals, experience level, and preferred type of sailing. Consulting with experienced sailors or boat dealers can help you make an informed decision.

Unraveling the Mystery of Dinghies

5.1 defining a dinghy.

A dinghy is a small boat, often with a shallow draft, suitable for short trips near the shore or larger vessels. Dinghies serve various purposes, such as transportation between a yacht and the shore.

5.2 Brief History of Dinghies

Dinghies have a rich history, dating back to ancient times when they were used as lifeboats and for short excursions from larger ships. Their design and purpose have evolved over centuries.

5.3 The Role of Dinghies Today

In the modern era, dinghies continue to play a crucial role in recreational sailing, racing events, and as safety boats for larger vessels. Their versatility and ease of handling make them an essential part of the sailing community.

Read   our  top  notch   articles  on  topics  such as  sailing ,  sailing   tips  and  destinations  in  our   Magazine .  

The versatility of the 420 sailboat, 6.1 thrilling racing experience.

The 420 sailboat offers an exhilarating racing experience, with its responsive design and competitive class association events worldwide. Sailing enthusiasts can participate in friendly regattas or challenging competitions.

6.2 Casual Sailing and Cruising

Beyond racing, the 420 sailboat is equally enjoyable for leisurely sailing and cruising. Its stable and forgiving nature makes it suitable for novices, families, and friends seeking quality time on the water.

6.3 Ideal for Novices and Experts Alike

The 420 sailboat strikes a perfect balance between beginner-friendly features and high-performance capabilities. Novice sailors can develop their skills with ease, while experienced sailors can explore advanced techniques.

420 Sailboat vs. Flying Junior Sailboat

7.1 a closer look at flying junior sailboat.

The Flying Junior (FJ) sailboat is another popular double-handed dinghy known for its competitive racing and sailing programs in schools and clubs worldwide.

7.2 Key Differences and Similarities

While the 420 sailboat and Flying Junior share similarities in terms of size and purpose, they have distinct design elements, which affect their handling and performance.

7.3 Choosing Between the Two

Choosing between the 420 sailboat and Flying Junior depends on individual preferences, training programs available, and desired sailing experience. Both boats offer thrilling adventures for sailors of all ages.

Yacht vs. Boat: Understanding the Distinction

8.1 what defines a yacht.

A yacht is a larger and more luxurious vessel, often used for recreational purposes, cruising, and leisure activities. Yachts are known for their opulence, amenities, and long-range capabilities.

8.2 How is a Boat Different?

Boats, including sailing dinghies like the 420, refer to smaller watercraft used for various purposes, such as sailing, fishing, transportation, and sports.

8.3 Determining the Right Vessel for Your Needs

Selecting between a yacht and a boat depends on factors such as budget, desired activities, number of passengers, and the kind of sailing experience you wish to have.

The Thrill of 420 Sailing Competitions

9.1 the competitive spirit.

420 sailing competitions are known for their competitive spirit and camaraderie among sailors. Participants challenge their skills and tactics to outperform their rivals.

9.2 International 420 Class Association (ICA)

The International 420 Class Association (ICA) is the governing body that organizes and regulates 420 sailing events worldwide, fostering a vibrant and inclusive sailing community.

9.3 Notable 420 Sailing Events

From local regattas to prestigious international championships, 420 sailors have the opportunity to participate in a wide range of events that cater to different skill levels and age groups.

Owning a 420 Sailboat: A Dream Come True

10.1 factors to consider before purchasing.

If you're considering owning a 420 sailboat, factors like budget, boat condition, and available storage space should be carefully evaluated to make the right investment.

10.2 Maintaining Your 420 Sailboat

Proper maintenance is essential for keeping your 420 sailboat in top-notch condition. Regular inspections, cleaning, and timely repairs contribute to its longevity and performance.

10.3 Cherishing the Sailing Memories

Owning a 420 sailboat is not just about the vessel itself but the unforgettable memories created on the water. Cherish the moments spent sailing, racing, and exploring new horizons.

420 sailboats have captivated sailors worldwide, offering a versatile and thrilling sailing experience. From competitive racing to leisurely cruising, the 420 sailboat has proven its mettle as a reliable and exciting dinghy. Whether you're an experienced sailor seeking a new challenge or a novice eager to learn the ropes, the 420 sailboat is ready to take you on a memorable adventure on the open waters.

So  what  are  you   waiting   for ?  Take  a  look   at   our   range   of  charter  boats  and  head  to  some   of   our  favourite     sailing   destinations .  

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Mackay International 420

$ 12,500.00

Includes spin bags, rudderstock, tiller & extension, all fittings, FSE Robline lines & sheets ready to race, with measurement form and ISAF plaque.

Also includes spars, foils, beach trolley and covers.

Questions? Call Mackay USA Rep Tom Sitzmann 443-220-2089

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The Mackay 420 won the first World Championship it entered. Alexandros & Georgios Kavvas from Greece won 7 of the 10 races in the 2012 World championships. The following year Annabel Cattermole & Bryony Bennett-Lloyd won the 2013 Ladies World Championships. The 2012 post series  press release  stated “Speed was the name of the game for the Greeks, and they had the edge whatever the conditions. ” Price here includes foils, spars, beach trolley, covers.

Interested in a world-class Mackay Boat? Contact Sail1Design for:

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For more information, please   contact Mackay East Coast

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The International 420 Class Rules

The 420 is an International Class which means the 420 Class Rules are owned and maintained by World Sailing, but with input from the 420 International Technical Committee

The Class Rules specify the 420 and how it is used – this is the document which details everything from how big and what shape a 420 should be, how it should be constructed and what the accompanying things, such as spars, sails, control systems should be like. Any 420 wishing to race must comply with these rules.

The current Class Rules were released in December 2021 and can be found HERE :

Summary of the key differences between the 2017 class rules and the December 2021 rules

The Equipment Rules of Sailing (ERS)

Of all the rules that relate to 420 racing the ERS are probably the least read. These are quite technical and should be read in conjunction with the Class Rules and provide more general governance of the equipment used in the sport. The ERS rules are revised and published every four years by World Sailing.

More information about these rules can be found here: https://www.sailing.org/inside-world-sailing/rules-regulations/equipment-rules-of-sailing/

They are also available in the World Sailing App which is a good way to keep these rules on your phone.

The Racing Rules of Sailing (RRS)

The Racing Rules of Sailing are owned and published by World Sailing and govern the rules used when 420’s race. It’s really important you read these! They are available online here https://www.sailing.org/inside-world-sailing/rules-regulations/racing-rules-of-sailing/ however I recommend you download the World Sailing App which allows you to keep a copy on your phone, ready in case you need them for a protest!

Reading these rules can be a bit boring(!), so I recommend you buy the following great book as it includes the Racing Rules of Sailing, but also includes pictures and some scenarios which make it a lot easier to read and understand them.

The Rules in Practice 2021-2024 by Bryan Willis

https://www.amazon.co.uk/Rules-Practice-2021-2024-Sailing-Around/dp/1912621231

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INTERNATIONAL 420

Make your mark in the 420.

Ignite your passion for sailing with the International 420 class and North Sails as your trusted partner. Our high-performance sails are designed to elevate your 420 experience to new heights. Whether you're racing at the top level or exploring the joys of sailing, North Sails has the expertise and cutting-edge technology to help you dominate the competition. Join the ranks of young sailors who trust North Sails to provide the winning edge in the International 420 class. Experience the thrill of sailing with the ultimate competitive advantage. It's time to set sail and make your mark with North Sails by your side.

INTERNATIONAL 420 SAILS

All-Purpose | Teams below 115kg

All-Purpose | Teams 110-125kg

All-Purpose | Teams above 120kg

All-Purpose

420 TUNING GUIDE

Get ready to tune up your International 420 like a pro with the North Sails Tuning Guide. Packed with cool tips and tricks, this guide will help you unlock the speed and excitement you crave on the water. Level up your 420 game and sail with style using North Sails' expert tuning advice.

INT. 420 EXPERTS

Kei takakuwa, riccardo de felice, derek scott.

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SAILORS Buy and Sell Marketplace

The International 420 Class Association is working with Nautest seaBay to provide a BUY & SELL platform for 420 boats, sails, spars, foils and all 420 kit.

You can upload and manage your adverts yourself. The 420 Buy & Sell Marketplace is free of charge to use - take a look at nautest.com/market/420

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