matilda 20 sailboat

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• Sailboat Guide

Matilda 20 is a 19 ′ 5 ″ / 5.9 m monohull sailboat designed by Robert Tucker and built by Ouyang Boat Works starting in 1971.

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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Lifting Keel

Specifications MATILDA 20

19.50 ft / 5.94 m - 1971 - Ouyang Boat Works (CAN) - Robert Tucker

MATILDA 20 Sailboat Data

Hull Type: Lifting Keel Rigging Type: Masthead Sloop LOA: 19.50 ft / 5.94 m LWL: 16.33 ft / 4.98 m S.A. (reported): 177.00 ft² / 16.44 m² Beam: 7.92 ft / 2.41 m Displacement: 1,550.00 lb / 703 kg Ballast: 300.00 lb / 136 kg Max Draft: 4.16 ft / 1.27 m Min Draft: 0.75 ft / 0.23 m Construction: FG First Built: 1971 Builder: Ouyang Boat Works (CAN) Designer: Robert Tucker

Information from  sailboatdata.com .

Hull Speed: 5.41 kn

The Matilda 20 is a 19.5ft masthead sloop designed by Robert Tucker and built in fiberglass by Ouyang Boat Works (CAN) since 1971.

The Matilda 20 is a light sailboat which is a high performer. It is very stable / stiff and has a low righting capability if capsized. It is best suited as a day-boat.

Matilda 20 for sale elsewhere on the web:

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Review of Matilda 20

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 Capsize Screening Formula (CSF)?

The capsize screening value for Matilda 20 is 2.73, indicating that this boat would not be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 5.4 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 Matilda 20 is about 80 kg/cm, alternatively 450 lbs/inch. Meaning: if you load 80 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 450 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 Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is Displacement Length Ratio?

What is SA/D (Sail Area Displacement 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 Matilda 20 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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Sailing with Matilda: Hixson man's rare sailboat featured in national magazine

November 3, 2014 at 1:00 a.m. | Updated November 3, 2014 at 1:00 a.m.

by Barry Courter

With winter's cold coming, Brooks Northern will likely not take his Matilda 20 sailboat onto the water for a few months. But he can get a bit of his boating fix by reading about his craft in a national magazine.

The four-page article about his boat, "Wing Ding II," appears in the November/December issue of "Good Old Boat," which is dedicated to sailing enthusiasts. Northern's first boat, a small Sunriser he carried around on top of his car, was the first "Wing Ding," a whimsical name that even Northern himself is not sure of its origin.

"It just sounded like a party," he says. "I'm not even sure where it came from."

Matilda sailboats are popular in Canada, England and Australia, but somewhat rare in the United States. When Northern contacted the editors at the Minnesota-based magazine about featuring them in an article, they sent a reporter to Chattanooga to interview him.

"There aren't many boats like this in this country," Northern says at his Hixson home.

Northern, 79, and writer Bob Hoffman spent a day sailing on Lake Chickamauga last summer and, several days later, Northern hauled his boat to Paris, Tenn., to sail on Kentucky Lake near Hoffman's home.

A thin, athletic man, Northern lights up when talking about "Wing Ding II," especially when describing how he has to rest the mast on his shoulder and walk it into place to raise it.

"I built a crutch because I had to figure out ways to raise it myself," he says.

Along with the Matilda 20, the sailboats also come in 16 and 23 models, but those are very rare; Matilda 20s are the more popular version around the world. The numbers refer to general lengths of the crafts.

While serving in the Air Force and stationed overseas in the early '70s, Northern saw one of the boats at the London Boat Show and decided he had to have one.

"I just like the old-timey look of them," Northern says. "They have a classic look."

The expense of shipping one over from England to the U.S. put his dream on hold, however, and it wasn't until the career military man was reassigned to Oklahoma that he discovered that Matildas were also made in Canada. He bought his in 1975 from the Ouyang Boat Works, which produced them until 1986 when it went out of business.

The "Wing Ding II" is 19 feet 6 inches from tip to tip with a 19-foot mast. The boat itself is made of molded fiberglass and trimmed in teak. In fact, the hull, galley, bunk area and deck are all made from four individual pieces of molded fiberglass. It can sleep four, though Northern says he has only overnighted in the boat about four times.

The fact that his Matilda could pass for nearly new is a testament to its design and construction.

One of the unusual characteristics of the boat is that it only has a 9-inch draft with the retraction of the keel (the large fin that sticks out perpendicular to the hull beneath the water), allowing Northern to get right up near the shoreline for loading and unloading passengers and for retrieval of the Matilda at the boat ramp. It also makes the 1,500-pound boat (2,500 pounds with trailer and all) easy to haul.

In boating parlance, the Matilda has a "conventional Marconi sloop rig with upper shrouds (a wire or line stay from the deck or hull supporting the mast on each side), single lower shrouds, a single set of spreaders (metal struts on the mast that hold the shrouds out from the mast for a better support angle), a split non-adjustable backstay (the rigging that runs from the mast to the transom or rear quarter), and a sturdy aluminum mast and boom," according to Hoffman's article.

The molded design and shape of the boat make it more comfortable when sailing, but it also is less likely to tilt or roll with people stepping on and off or moving about while under sail.

"It's a very stable boat," Northern says.

That's an important factor for Northern's wife, Mary Alice, who suffers from neuropathy, a nerve disorder that causes numbness and tingling in the hands and feet.

"It's convenient for me to get on," she says, "and I have a place to sit in the sun or I have a place to take a nap if I want to. I don't get into the mechanics of it because I have neuropathy, but it is easy for me to get into and out of."

Northern has tried to keep the boat as close to original as possible, although he has made a few modifications to the rigging and to the mast, particularly how it meets the deck, which allows him to raise it by himself. At the suggestion of Hoffman, he also recently replaced the originally flat, aluminum rudder with a streamlined version that better displaces the water.

He had to have the hull repainted once after storing it under some trees, an issue he rectified by building a barn specifically for housing the craft.

"I just clean it and oil the wood, now," he says.

Contact Barry Courter at [email protected] or 423-757-6354.

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Let's connect, why it's important to partner with a designer on your matilda 20 sail.

The design is the most critical part of your new sail. Ensuring the sail fits and performs its best is a must for our crew. The Precision Sails Design team are experts at their craft. Unlike other sail lofts all of our sailors work one-on-one with a designer to perfect their Matilda 20 sail.

No Two Matilda 20 Sails Are Alike

There are many factors that affect the performance and design of your sails. Location, sailing experience, and weather conditions all come into play when picking the perfect sail. Two mainsails made for two Matilda 20’s in California and Florida will have different designs, sailcloth, and options based on what is best for the sailor.

Taking measurements is easy. All sailors work alongside our measurement team to measure and confirm their rig specs. This helps ensure your design is flawless and allows us to extend our Perfect Fit Guarantee to all of our sailors.

Discover the best cloth for your sailing needs, our sail details, or more about how Precision Sails is leading the sail-making industry with innovative new practices.

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Looking to buy a new headsail or mainsail for your Matilda 20? Request a free quote from Precision Sails for a new custom sail. Our team will work with you to design the perfect sail for you.

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Matilda 20 advise

• Thread starter Rascal3
• Start date 2 Mar 2019

Hi I've just bought my first boat, a Matilda 20. She's a bit of a doer upper and I knew that when I bought her but I've now got her and am able to really crawl all over her. She's been stored in a garage for years and she's leaking a bit in the rain we've had and I've noticed that around the internal plywood bulkheads that there was damp wood in the corners where they meet the hull. So I did the natural thing and poked them, turns out they're rotten as a pear. Now the drop keel casing in the middle of the boat goes to the roof. Does anyone know then if the bulk heads are structural or whether I would be ok to rip them out and open out her layout?  

Well-known member

I reckon you'll get the best advice via the Matilda Owners website - http://www.matildaowners.com/index.htm  

I had one. I did see one which had had the bulkhead removed as you suggest, and it seemed to be entirely OK, but as above, the Owners club is the best bet to be sure.  

Thanks for the info, I've posted on the owners site as well but it seems quite under utilised so I thought id post here as well. I image I'll be back often for repair advise.  

One of the common structural purposes of ply bulkheads is to transfer the loads of the chain plates down into the hull. Other wise perhaps not so much concern. At 20 ft she should be pretty structurally stiff in the hull/deck anyway. ol'will  

With them as rotten as they are I'm not sure they've been supplying much support for a long while.  

Rascal3 said: Hi I've just bought my first boat, a Matilda 20. She's a bit of a doer upper and I knew that when I bought her but I've now got her and am able to really crawl all over her. She's been stored in a garage for years and she's leaking a bit in the rain we've had and I've noticed that around the internal plywood bulkheads that there was damp wood in the corners where they meet the hull. So I did the natural thing and poked them, turns out they're rotten as a pear. Now the drop keel casing in the middle of the boat goes to the roof. Does anyone know then if the bulk heads are structural or whether I would be ok to rip them out and open out her layout? Click to expand...

James_Calvert

Which means under sail the deck might be pulled up by the windward shrouds, if it is not stiff enough. Is the centre plate casing firmly attached to the deckhead? That could help.  

Yeah the centre board is fiberglassed into the roof so it doesn't look too bad. It's 1970s fiberglass as well so built like a tank.  

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• Boat REF#  ·  147476
• Length  ·  5.94m
• Year  · 
• Construction  ·  GRP
• Underwater profile  ·  Lifting Keel
• Sleeping berths  ·  4
• Engine  ·  1 x gas 2 stroke 6hp, Mariner (2008)
• Lying  ·  Yorkshire

Boatshed Yorkshire

This boat is off the market but here are some boats that are still for sale.

• Specification
• Additional Information

Extra Details

Sloop rigged Aluminium spars () with Stainless Steel standing rigging ()

Construction

Accommodation.

2 sheet winches 1 anchors (Danforth ) 5.00m of chain

Nav Equipment

Broker's comments.

This is a delightful little craft, only used on fresh water the last five years, that is beamy so safe and stable for family use. Its shallow draft makes it ideal for lake sailing but also for estuary cruising say on the East Coast.

These boat details are subject to contract. Note: Offers on the asking price may be considered.

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Baralaba South coal mine proposal signals renewed fight from farmers with Dawson River concerns

For more than a decade, the tiny town of Baralaba has fought a David-versus-Goliath battle against major international companies and their plans to develop a coal mine near the Dawson River.

After taking their fight all the way to the United Nations, the community thought they had won.

But now a new company has lodged a plan locals fear will contaminate drinking water supplies and prime agricultural land.

Bronny McLellan and her husband Paul operate a cattle and lychee property near the Dawson River and are part of Save the Dawson, a grassroots community group of farmers who oppose the project.

"It takes a toll on your family," Ms McLellan said.

"Our grandchildren, which are here on the farm, are sixth generation … it's not a nice feeling to think you could be taken over by a mine."

Save the Dawson chairperson and farmer Lex Webb said the risk of an environmental catastrophe was too high. 

He feared run-off from the mine would pollute the Dawson River and drinking water supplies, with coal mine dust on crops also a major concern.

"It's very stressful to everyone involved because we're farmers. We're not lobbyists," Mr Webb said.

Mine size already reduced

Baralaba Coal is proposing a new metallurgical coal mine south of Baralaba, about 115 kilometres west of Rockhampton.

The company is majority owned by US-based American Metals and Coal International (AMCI). 

If approved, it would mine 2.5 million tonnes of coal per year for export and operate for 23 years — subject to several factors, including market conditions.

The project would support 521 ongoing jobs, which would continue to provide employment when its other mine, Baralaba North, winds down.

Baralaba Coal said it had minimised the size of the mine following community consultation by halving the amount of coal it would produce.

According to environmental documents, the risk of run-off contamination would be reduced through measures like dam infrastructure.

The company said it had also moved the project so it was predominantly off the flood plain, minimising the risk from flooding.

While Save the Dawson acknowledged the proposal had changed, members said they were not confident in the flood modelling because of the rising threat of climate change.

"We're trying to protect prime ag land because they're not making this type of country anymore," Mr Webb said.

Fears for water, Great Barrier Reef

Douglas Graham is a Gooreng Gooreng, Lamalama and Jiman man who lives in Woorabinda, a nearby Aboriginal and Torres Strait Islander community that, for many, has a strong cultural connection to the Dawson River.

The town, alongside Baralaba, also relies on the river for drinking water.

"It's a big worry just trying to survive now but when the water goes, we all go," Mr Graham said.

"We're going to suffer because of the quality of the water."

Matilda Widdowson from Environmental Advocacy in Central Queensland said it would also pollute water that flows into the Great Barrier Reef.

"The reef is already feeling the pressure of the fifth bleaching event in eight years, and simply can't afford to be having new coal projects put in that will continue to pollute the atmosphere and the water further," she said.

Calls for premier to intervene

Save the Dawson is calling on Queensland Premier Steven Miles to visit Baralaba and reject the plan.

But Mr Miles said that was the role of the Department of Environment, Science and Innovation (DESI).

He said he was aware of the project and was happy to speak to concerned community members, but mining project assessments in Queensland were "well-established and stringent".

Save the Dawson founding member Paul Stephenson said it was unfair locals had to continue the fight against the project, 12 years on.

"We've got farmers out working 18-hour days and then we're expected to do the work of government in critiquing, analysing and applying legislation," Mr Stephenson said.

DESI said it would consider all submissions as part of its assessment of the environmental impact statement.

It said Baralaba South would be required to respond to submissions and outline plans to address community concerns.

Baralaba Coal said it had been open and transparent about the future of the mine with the community.

The company said it had reopened its community office in town, held open sessions, and met with individuals about the project, among other measures.

A United Nations complaint

In 2021, locals thought they had won their fight against the proposal when US company Liberty Mutual confirmed it would not progress with plans to build the mine, after Save the Dawson filed a complaint with the United Nations.

But when Liberty Mutual sold Baralaba Coal to AMCI, the application was sold with it.

AMCI is not a signatory to a United Nation's investment promise and plans were relaunched.

Public submissions close on May 1.

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