Manufacturer part #: RF72700B 1
Technical Description
Two-Speed Mainsheet System Bottom Blocks Only
3 in + 2 in
75 mm + 50 mm
3/8 in
10 mm
1760 lb
800 kg
3750 lb
1700 kg
30.2 oz
855 g
Manufacturer part #: RF72700B![Ronstan RF72700B Two-Speed Mainsheet System Bottom Blocks Only Ronstan 2 Speed Mainsheet System](/product_images/uploaded_images/Tech_Info/Ronstan-Sailboat-Hardware/Ronstan-RF72700B.jpg)
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 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
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) Materials
Carbon Black Acetal ball bearings U.V. stabilised Acetal sheaves, alloy ratchet sheaves Alloy cheeks Torlon° ratchet pawl Adjustable cleat arms
![Ronstan RF72700B Two-Speed Mainsheet System Bottom Blocks Only Ronstan 2 Speed Mainsheet System](/product_images/uploaded_images/Tech_Info/Ronstan-Sailboat-Hardware/Ronstan-RF72700B.jpg)
When fitting to traveller cars, ensure adequate support for the bottom block and use stand-up spring kit RF324-1 or RF324-2.
Applications