Two-speed Mainsheet System Bottom Blocks Only (For RF72700)

Sheave Dia: 75+50 mm / 3+2 in
Max Rope Dia.: 10 mm / 3/8 in
Maximum Working Load: 800 kg / 1760 lb
Breaking Load: 1700 kg / 3750 lb
Weight: 950 g / 33.5 oz

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.

Applications:

• Two-Speed systems: Mainsheets on sportsboats and keel boats to 12m (40ft).
• Mainsheets on sportsboats and keelboats to 12m (40 in).
• Max. mainsail area, END boom sheeting = 38sq m (409 sq ft).
• Max. mainsail area, MID boom sheeting = 23sq m (248 sq ft).

Materials:

• Carbon Black Acetal ball bearings.
• U.V. stabilised Acetal sheaves, alloy ratchet sheaves.
• Cheek plates: Anodised aluminium.
• Torlon® ratchet pawl.
• Adjustable cleat arms.

Our Part # RONRF72700B | Ronstan Part # RF72700B

Features:

• Coarse and and fine tuning purchase system.
• Unrivalled 18:1 holding power.
• Dual sided On-Off switch.
• Low friction ball bearing system.
• Light Weight.
• Cheek cut-outs for easy bearing maintenance.