Cam cleats and stoppers are two essential tools for controlling the sheets (the ropes used to adjust the sails) on sailing boats. Both help maintain proper sail tension and manage lines safely, but they perform slightly different roles.

1. Cleat (or cleat sheet)

A cleat is a device used to lock and adjust the tension of a sheet, keeping the sail in the desired position without having to hold it manually. It is primarily used to slow or lock a sheet without the risk of losing tension.

Main features:

Function : It is used to lock the sheet so that it does not move accidentally. It can be used to secure a sheet in a certain position, preventing the sail from shifting or coming loose.

Composition : Cam cleats are generally made of stainless steel , aluminum , or composite materials to resist wear and tear and harsh weather conditions.

Action : Once the sheet has passed through the cleat, this mechanism tightens the rope, stopping it. Some cleats have a lever mechanism that allows the sheet to be easily released when necessary.

Placement : Cleats are usually mounted on the stern , mainsail rigging , or other lines where tension must be kept constant.

Types of cleats:

Manual cleats : These are manually adjustable, where the user must apply pressure to lock the sheet.

Automatic cleats : These will automatically lock the sheet as soon as it is released.

2. Stopper (or sheet stopper)

The stopper , on the other hand, has a more specific role in temporarily stopping a sheet when the tension becomes too high or when an adjustment is needed. In general, a stopper is a device that prevents the sheet from sliding unintentionally and allows the correct tension to be maintained.

Main features:

Function : The stopper is used to hold a sheet and prevent it from slipping, maintaining the desired tension. It is used in situations where you want to keep a sheet taut without having to actively hold it, but without permanently blocking it.

Composition : Stops are also made of durable materials such as stainless steel or composites . The central part is designed to exert enough pressure on the sheet to hold it, but not so much as to prevent it from being released if necessary.

Mechanism : Stoppers usually operate via a lever bar that opens or closes when the sheet is inserted. In some cases, a spring-loaded lock is used to hold the sheet in place.

Placement : Stops are generally found on mainsheets , jibsheets , and other sailing rigging, where tension must be held constant throughout the movement of the sail.

Types of stoppers:

Lever stoppers : They can be adjusted manually and, once the tension is set, the system holds them still.

Spring-Locking Stoppers : These are more automatic, releasing the line only when tension is released or the device is operated.

Main differences between cleats and stoppers :

Cam Cleat : Used to completely lock the sheet in place, preventing it from slipping or changing tension. It is more "rigid" in its application.

Stopper : Used to maintain tension without completely blocking the sheet. It allows the sheet to be held while allowing for more flexible adjustment.

Where to use them:

Cam Cleat : Ideal for emergency situations or for holding a sheet in place without interruption. It is very useful when handling large sails or making adjustments on board.

Stopper : It is useful for tensioning and maintaining the sheets during regular maneuvers without definitively stopping the movement of the sheet.

Maintenance:

Cleaning : It is important to keep both devices free of salt and sand to prevent them from becoming blocked or worn out.

Lubrication : Moving parts, such as those in the lever or spring, should be periodically lubricated to prevent them from rusting or hardening.

Parts Check : Regularly check for damage to the metal part or locking mechanism to ensure safe operation.

Conclusion:

Both cleats and stoppers are essential devices for controlling and trimming sails. While they serve similar purposes, each has specific characteristics that make it better suited to certain sailing situations. Having both devices on board ensures greater safety and control when maneuvering.