mermaid class sailboat

Review of Mermaid Class

Basic specs..

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

The Mermaid Class is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The boat can enter even shallow marinas as the draft is just about 0.99 - 1.09 meter (3.25 - 3.55 ft) dependent on the load. See immersion rate below.

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 Mermaid Class is 1.76, indicating that this boat could - if evaluated by this formula alone - 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 5.1 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 Mermaid Class is about 50 kg/cm, alternatively 284 lbs/inch. Meaning: if you load 50 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 284 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 a Ballast Ratio?

What is Displacement Length Ratio?

SA/D (Sail Area Displacement ratio) Indicates how fast the boat is in light wind: - Cruising Boats have ratios 10-15 - Cruiser-Racers have ratios 16-20 - Racers have ratios above 20 - High-Performance Racers have ratios above 24 Sail-area/displacement ratio (SA/D ratio): 18.32

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 9m 2 (96 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

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 is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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

We are always looking for new photos. If you can contribute with photos for Mermaid Class 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

CT-42 (Mermaid)

CT-42 (Mermaid) is a 41 ′ 4 ″ / 12.6 m monohull sailboat designed by Ta Chaio and built by Ta Chiao starting in 1975.

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)

According to the builder’s brochure, this is a ‘modernized’ version of the CT-41 which was, in turn, based on the William Garden designed SEA WOLF.

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11 Aug 2024

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HAPPY HOUR = 18:00 - 20:00 = 20% DISCOUNT NO DISCOUNT ON PIZZA & PITCHER Its coming home this Sunday! England play Spain in the final of Euro 2024. The Club will again show the televised game both in the lower Clubhouse and Mermaid Room. £35 Freshly Made Pizza & Pitcher of Beer, Members are encourage to come and add to the atmosphere and witness as the national team bring the cup home! More »

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After a slow start to the tournament England have qualified for the semi finals and play the Netherlands on Wednesday night at 20:00. Can Gareth Southgates squad get one over the Dutch national team and progress to the final? Head down to the Club for build up from 19:00. KO at 20:00. Come on England! Its coming home?!? More »

Sophia Mordaunt (aged 17) and her father, Alastair, are attempting to swim the English Channel

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Welcome to our Resources page, here you can find downloadable files including our mermaid constitution, notices of race, sailing instructions, membership forms and more. Simply click on a file to view or download. If you have any issues accessing these resources please let us know by emailing [email protected] .

Mermaid Constitution

Mermaid Specification

Documents by year.

S.I. – Rush Regatta_2-3 July 2022

N.O.R – Rush Regatta_2-3 July 2022

Entry Form – Rush Regatta 2022

Munster Championship – Sailing Instructions

Mermaid Nationals 2021 Sailing Instructions (SIs)

Mermaid Nationals 2021 NoR (with Changes)

2021 Membership Form

Mermaid AGM Minutes 2019

Mermaid AGM Boat Measurers Report 2019

Mermaid AGM Sail Measurers Report 2019

Mermaid AGM Secretary’s Report 2019

Mermaid AGM Treasurer’s Report 2019

Membership & Declaration Form 2019

Mermaid MUNSTER CHAMPIONSHIP 2019 – Notice of Race FYC

Mermaid MUNSTER CHAMPIONSHIP 2019 – Sailing Instructions FYC

2018 Mermaid National Championship Sailing Instructions

2018 Boat Measurer’s Checklist – Mermaid Specifications

2018 Membership Form and Declaration_PDF Format

2018 Membership Form and Declaration_Editable WORD format

General Documents

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Class diagrams ​

"In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects." -Wikipedia

The class diagram is the main building block of object-oriented modeling. It is used for general conceptual modeling of the structure of the application, and for detailed modeling to translate the models into programming code. Class diagrams can also be used for data modeling. The classes in a class diagram represent both the main elements, interactions in the application, and the classes to be programmed.

Mermaid can render class diagrams.

UML provides mechanisms to represent class members, such as attributes and methods, and additional information about them. A single instance of a class in the diagram contains three compartments:

• The top compartment contains the name of the class. It is printed in bold and centered, and the first letter is capitalized. It may also contain optional annotation text describing the nature of the class.
• The middle compartment contains the attributes of the class. They are left-aligned and the first letter is lowercase.
• The bottom compartment contains the operations the class can execute. They are also left-aligned and the first letter is lowercase.

Define a class ​

There are two ways to define a class:

• Explicitly using keyword class like class Animal which would define the Animal class.
• Via a relationship which defines two classes at a time along with their relationship. For instance, Vehicle <|-- Car .

Naming convention: a class name should be composed only of alphanumeric characters (including unicode), underscores, and dashes (-).

Class labels ​

In case you need to provide a label for a class, you can use the following syntax:

You can also use backticks to escape special characters in the label:

Defining Members of a class ​

UML provides mechanisms to represent class members such as attributes and methods, as well as additional information about them.

Mermaid distinguishes between attributes and functions/methods based on if the parenthesis () are present or not. The ones with () are treated as functions/methods, and all others as attributes.

There are two ways to define the members of a class, and regardless of whichever syntax is used to define the members, the output will still be same. The two different ways are :

• Associate a member of a class using : (colon) followed by member name, useful to define one member at a time. For example:
• Associate members of a class using {} brackets, where members are grouped within curly brackets. Suitable for defining multiple members at once. For example:

Return Type ​

Optionally you can end a method/function definition with the data type that will be returned (note: there must be a space between the final ) and the return type). An example:

Generic Types ​

Generics can be represented as part of a class definition, and for class members/return types. In order to denote an item as generic, you enclose that type within ~ ( tilde ). Nested type declarations such as List<List<int>> are supported, though generics that include a comma are currently not supported. (such as List<List<K, V>> )

note when a generic is used within a class definition, the generic type is NOT considered part of the class name. i.e.: for any syntax which required you to reference the class name, you need to drop the type part of the definition. This also means that mermaid does not currently support having two classes with the same name, but different generic types.

Visibility ​

To describe the visibility (or encapsulation) of an attribute or method/function that is a part of a class (i.e. a class member), optional notation may be placed before that members' name:

• # Protected
• ~ Package/Internal

note you can also include additional classifiers to a method definition by adding the following notation to the end of the method, i.e.: after the () or after the return type: * Abstract e.g.: someAbstractMethod()* or someAbstractMethod() int* $ Static e.g.: someStaticMethod()$ or someStaticMethod() String$

note you can also include additional classifiers to a field definition by adding the following notation to the very end: $ Static e.g.: String someField$

Defining Relationship ​

A relationship is a general term covering the specific types of logical connections found on class and object diagrams.

There are eight different types of relations defined for classes under UML which are currently supported:

We can use the labels to describe the nature of the relation between two classes. Also, arrowheads can be used in the opposite direction as well:

Labels on Relations ​

It is possible to add label text to a relation:

Two-way relations ​

Relations can logically represent an N:M association:

Here is the syntax:

Where Relation Type can be one of:

And Link can be one of:

Define Namespace ​

A namespace groups classes.

Cardinality / Multiplicity on relations ​

Multiplicity or cardinality in class diagrams indicates the number of instances of one class that can be linked to an instance of the other class. For example, each company will have one or more employees (not zero), and each employee currently works for zero or one companies.

Multiplicity notations are placed near the end of an association.

The different cardinality options are :

• 0..1 Zero or One
• 1..* One or more
• n n (where n>1)
• 0..n zero to n (where n>1)
• 1..n one to n (where n>1)

Cardinality can be easily defined by placing the text option within quotes " before or after a given arrow. For example:

Annotations on classes ​

It is possible to annotate classes with markers to provide additional metadata about the class. This can give a clearer indication about its nature. Some common annotations include:

• <<Interface>> To represent an Interface class
• <<Abstract>> To represent an abstract class
• <<Service>> To represent a service class
• <<Enumeration>> To represent an enum

Annotations are defined within the opening << and closing >> . There are two ways to add an annotation to a class, and either way the output will be same:

• In a separate line after a class is defined:
• In a nested structure along with the class definition:

Comments can be entered within a class diagram, which will be ignored by the parser. Comments need to be on their own line, and must be prefaced with %% (double percent signs). Any text until the next newline will be treated as a comment, including any class diagram syntax.

Setting the direction of the diagram ​

With class diagrams you can use the direction statement to set the direction in which the diagram will render:

Interaction ​

It is possible to bind a click event to a node. The click can lead to either a javascript callback or to a link which will be opened in a new browser tab. Note : This functionality is disabled when using securityLevel='strict' and enabled when using securityLevel='loose' .

You would define these actions on a separate line after all classes have been declared.

• action is either link or callback , depending on which type of interaction you want to have called
• className is the id of the node that the action will be associated with
• reference is either the url link, or the function name for callback.
• ( optional ) tooltip is a string to be displayed when hovering over element (note: The styles of the tooltip are set by the class .mermaidTooltip.)
• note: callback function will be called with the nodeId as parameter.

It is possible to add notes on the diagram using note "line1\nline2" . A note can be added for a specific class using note for <CLASS NAME> "line1\nline2" .

Success The tooltip functionality and the ability to link to urls are available from version 0.5.2.

Beginner's tip—a full example using interactive links in an HTML page:

Styling a node (v10.7.0+) ​

It is possible to apply specific styles such as a thicker border or a different background color to an individual node using the style keyword.

More convenient than defining the style every time is to define a class of styles and attach this class to the nodes that should have a different look. This is done by predefining classes in css styles that can be applied from the graph definition using the cssClass statement or the ::: short hand.

Then attaching that class to a specific node:

It is also possible to attach a class to a list of nodes in one statement:

A shorter form of adding a class is to attach the classname to the node using the ::: operator:

?> cssClasses cannot be added using this shorthand method at the same time as a relation statement.

?> Due to limitations with existing markup for class diagrams, it is not currently possible to define css classes within the diagram itself. Coming soon!

Default Styles ​

The main styling of the class diagram is done with a preset number of css classes. During rendering these classes are extracted from the file located at src/themes/class.scss. The classes used here are described below:

Sample stylesheet ​

Configuration ​.

Coming soon!