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Ronstan Two-speed Mainsheet System, Ratchet, 2 Speed, 6:1, 3:1
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Ronstan

Ronstan Two-speed Mainsheet System, Ratchet, 2 Speed, 6:1, 3:1

Code: RONRF72700
Price: $848.30

Currency:



 

Features:
Class leading performance and sleek, contemporary styling
Excellent dynamic and high static load performance
Less than half the friction of the nearest competitor
Removable becket pin for fitting of pre-spliced lines
** Line load through cleat not to exceed 175kg (385lb)

Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Universal Bearing -
Dynamic and high static load performance
The Ronstan Universal Bearing incorporates our proven 2-stage bearing system
Stage 1 - Under moderate loads, Acetal ball bearings ensure minimum friction.
Stage 2 - Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.
Additionally the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn’t perfect. Particularly important for cheek blocks.

Alloy cheek plates Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear. Applications
Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 12m (40ft).
Various control line applications on larger yachts.
Alloy sheave models are available for use with wire.

Materials:
Sheave: U.V. stabilised Acetal or anodised aluminium (AW models)
Cheek plates: Aluminium alloy
Ball Bearings: High compression strength carbon black Acetal





Specifications
Imperial Metric
Sheave Dia. 3" + 2" 75 mm + 50 mm
Max. Rope Dia. 3/8" 10 mm
Maximum Working Load 1760 lb 800 kg
Breaking Load 3750 lb 1700 kg
Weight 49.9 oz 1415 g

Product Description

The patented extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs - up to 18:1 holding power. Unrivalled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired), and for foot blocks simply turn the sheave upside down before installation to change the sense of rotation. Unique On-Off switch mechanism can be operated under load. Ratchet blocks can be disassembled for servicing or customisation.Removable becket pins allow lines to be pliced prior to fitting. Saddle on under side of cleat can be used as a becket take off point for the creation of a powerful 6:1 purchase system. A single block can be attached to the saddle to increase this to 7:1.

• Coarse and and fine tuning purchase system.
• Unrivalled 18:1 holding power.
• Dual sided On-Off switch.
• Low friction ball bearing system.
• Lightweight.
• Cheek cut-outs for easy bearing maintenance.
• Carbon Black Acetal ball bearings.
• U.V. stabilised Acetal sheaves, alloy ratchet sheaves.
• Alloy cheeks.
• Adjustable cleat arms.

Applications:
Mainsheets on sportsboats and keel boats to 12 m (40 ft), mainsheets on sportsboats and keelboats to 12 m (40'), max. mainsail area, END boom sheeting = 38 sq m (409 sq ft), max. mainsail area, MID boom sheeting = 23sq m (248 sq ft).

Part Number: RF72700





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