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Ronstan Two-speed Mainsheet System Top Blocks Only
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Ronstan

Ronstan Two-speed Mainsheet System Top Blocks Only

Code: RONRF72700T
Price: $293.25

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 19.8 oz 560 g

Product Description

Two-speed mainsheet systems allow both coarse and fine tuning in a single purchase system. The system allows fine tuning of the mainsheet when sailing upwind by using one of the sheet tails and keeping the other cleated. Using both the sheets at once allows the trimmer to blow off the main quickly when rounding the top mark and trim on quickly when hardening up after rounding the bottom mark. When fitting to traveller cars, ensure adequate support for the bottom block and use stand-up spring kit RF324-1 or RF324-2.

• Unrivalled 18:1 holding power.
• Dual sided On-Off switch.
• Low friction ball bearing system.
• Lightweight.
• Cheek cut-outs for easy bearing maintenance.
• Coarse and and fine tuning purchase system.
• Carbon Black Acetal ball bearings.
• U.V. stabilised Acetal sheaves, alloy ratchet sheaves.
• Alloy cheeks.
• Torlon® ratchet pawl.
• 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 = 38sq m (409 sq ft), max. mainsail area, MID boom sheeting = 23sq m (248 sq ft).

Part Number: RF72700T





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