90 mm Synchro Fiddle Block - Swivel, Becket, Cam Cleat

The Lewmar 90 mm Synchro Fiddle Block with Swivel, Becket and Cam Cleat, model number 2992-9039, is a high-performance sailing block that offers speed, efficiency and superior handling.

Here are some of the details and specs of this product:
• fiddle design, which means it has two sheaves of different diameters on the same axle. This allows for a smaller and lighter block that can handle higher loads and reduce friction.
• swivel head, which allows the block to rotate freely in any direction. The swivel head also has asliding mechanism that can lock the block in two fixed positions (0° or 90° to the sheave axle) or allow full 360° rotation. The fixed positions allow for 30 degrees of rotational freedom, which helps to ensure that the block aligns with the system.
• becket, which is a loop or eye at the base of the block that can be used to attach another line or block. This can create a more complex and efficient pulley system.
• cam cleat, which is a device that can grip and release a line quickly and easily. The cam cleat has two spring-loaded jaws that clamp the line when it is pulled in one direction and release it when it is pulled in the opposite direction. The cam cleat can be used to adjust the tension of the line or secure it in place.
• stainless steel strap for improved strength and longer service life. The strap also prevents the line from wedging between the cheeks of the block.
• free-spin bearing and a self-aligning head that reduce friction and increase efficiency by up to 40% over budget blocks on mainsheet systems. The bearing and the head are synchronized with the movement of the rope, providing an easier and smoother transfer of power from deck to sail and less wear on the rope.

Applications

Plain bearing blocks are commonly used for carrying heavy and static loads in:
• Halyard tuning
• Mainsheet systems
• Mast foot blocks
• Mast head blocks
• Boom vang

How do I choose the right size and type of synchro block for my sailing needs?

To ensure a proper fit, consider these suggestions for selecting the right size and type of synchro block:
• Consider the load - choose a block rated for the expected load. Larger blocks are needed for heavier sheets/lines.
• Determine the line size - match the sheave diameter to the rope diameter. The sheave should be at least 3 times the rope diameter to avoid excessive wear.
• Assess your deck layout - will the block need a becket, swivel, or cam cleat? Swivel cheek blocks allow flexibility.
• Think about the sailing purpose - halyard blocks need strength for heavy loads, sail control blocks benefit from ball bearings.
• Factor in cheek size - wider cheeks dissipate heat better from friction. Go bigger for high load applications.
• Choose the right material - stainless steel offers strength, Delrin/nylon reduces weight.
• Get the right ratings - opt for offshore quality blocks rated for marine use.
• Consider ease of use - some blocks have ergonomic handles or ratchet mechanisms.
• Test the action before installing - the block should run smoothly without catching.

The correct selection of a synchro block is crucial to achieving an optimum level of sailing efficiency.