Description
Ronstan Series 55 Ratchet Block | Boat Supply Store
For dinghy racers and keelboat sailors demanding uncompromising control on asymmetric spinnaker sheets, this Ronstan Series 55 block provides up to 20:1 holding power via its Generation 2 sheave design. Its unique dual-mode engagement allows for seamless transition between automatic and manual ratchet activation, optimizing sheet handling during aggressive maneuvers like gybing. Constructed with toughened, glass-fiber reinforced nylon cheeks and an anodized aluminum sheave, this block ensures durability and reduced rope wear in high-load applications.
Key Features
- Unmatched Holding Power: Up to 20:1 for secure loads.
- Seamless Sheet Easing: Smooth and controlled release of lines.
- High-Performance Cleating: Reliable grip under extreme pressure.
- Versatile Engagement: Automatic and manual ratchet modes adaptable to conditions.
- Patented Sheave Geometry: Generation 2 design with 12 gripping faces for superior rope grip.
- Durable Construction: Anodized aluminum sheave and toughened nylon frame.
- Low-Friction Bearings: High compression strength acetal ball bearings ensure smooth operation.
- Robust Rope Link: UV stabilized, multi-strand Dyneema® rope for longevity.
Specifications
| Product Specifications | |
|---|---|
| Brand | Ronstan |
| Model | Series 55 Ratchet Mount Orbit Block |
| SKU | CWR70708 |
| MPN | RF56510 |
| Category | Sailing | Blocks |
| Holding Power | Up to 20:1 |
| Ratchet Modes | Automatic and Manual |
| Sheave Material | Anodized Aluminium |
| Bearing Type | Acetal ball bearings |
| Cheek Material | Glass-fiber reinforced Nylon |
| Rope Link Material | Dyneema® (SK75) |
Who This Is For
Performance-oriented sailors, including dinghy racers, keelboat sailors, and those involved in asymmetric spinnaker gybing, who require high holding power and flexible sheet control. Individuals seeking advanced hardware solutions for demanding sailing conditions will find this block indispensable.
How It Compares
| Feature | Ronstan Series 55 Ratchet Block | Competitor |
|---|---|---|
| Holding Power | Up to 21:1 | Up to 10:1 |
| Ratcheting Modes | Automatic & Manual | Automatic |
| Sheave Design | Generation 2, 12 gripping faces | Carbo |
| Frame Material | Toughened, glass fiber reinforced Nylon | High-strength composite |
Common Concerns Answered
Is the dual-mode ratchet difficult to operate?
While some users note an initial learning curve, understanding the automatic and manual engagement modes is straightforward with practice, offering significant versatility for sheet handling. This advanced functionality is a key differentiator for performance sailors.
Is this block significantly more expensive than basic options?
This block represents an investment in superior performance and durability, featuring advanced technology like its Generation 2 sheave and dual-mode ratchet not found in simpler, non-ratcheting blocks. The enhanced holding power and control justify the premium for serious racing applications.
How does the holding power compare to other ratchet blocks?
The Ronstan Series 55 offers up to 21:1 holding power, significantly exceeding competitors like the Harken 16mm Carbo Ratchomatic Block (up to 10:1) and Lewmar Synapse 50mm (up to 15:1), providing a more secure and reliable load management solution.
Frequently Asked Questions
What is the maximum holding power of the Ronstan Series 55 Ratchet Mount Orbit Block?
The Ronstan Series 55 Ratchet Mount Orbit Block provides a holding power of up to 20:1, ensuring secure control of high-load sheets.
Can the ratchet mechanism on this block be switched between automatic and manual modes?
Yes, this block features dual engagement modes, allowing you to switch between automatic and manual ratchet engagement for optimal sheet control in various sailing conditions.
What specific materials are used in the construction of this Ronstan block?
The block is constructed with a toughened, glass-fiber reinforced Nylon frame, an anodized aluminum sheave, and high compression strength acetal ball bearings, utilizing a Dyneema® rope link.
How does the Ronstan Series 55 block's holding power compare to competitors?
This block offers up to 21:1 holding power, substantially greater than many competitors, such as the Harken 16mm Carbo Ratchomatic Block which offers up to 10:1, and the Lewmar Synapse 50mm which offers up to 15:1.
What is the advantage of the Generation 2 sheave cross-hole geometry?
The Generation 2 patented sheave cross-hole geometry features 12 gripping faces, providing optimized rope grip and significantly reducing wear on both the sheave and the rope itself.
