Product Description

Ronstan Series 75 Top Blocks for RF72900 Twinspeed System
Features

Coarse and and fine tuning purchase system

Unrivaled 18:1 holding power

Dual sided On-Off switch

Low friction ball bearing system

Lightweight

Cheek cut-outs for easy bearing maintenance

Sheave Ø - 3 + 2 in.

Max. Rope Ø - 3/8 in.

Max. Cable Ø - in

Pin Ø - in.

M.W.L. - 2430 lb.

B. L. - 5070 lb.

Weight - 20.3 oz.
Product Information
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 traveler cars, ensure adequate support for the bottom block and use stand-up spring kit RF324-1 or RF324-2. (Refer to traveler section for more information).
Applications

Mainsheets on sportsboats and keel boats to 12m (40ft)

Mainsheets on sportsboats and keel boats to 12m (40')

Max. mainsail area, END boom sheeting = 42sq m (452 sq ft)

Max. mainsail area, MID boom sheeting = 27sq m (290 sq ft)
Materials

Carbon Black Acetal ball bearings

U.V. stabilized Acetal sheaves, alloy ratchet sheaves

Alloy cheeks

Torlon® ratchet pawl

Adjustable cleat arms