These dual purpose systems offer sailors the option of either speed or power. They are used for mainsheets on small to medium-sized offshore boats where power is required for effective heavy-air trimming upwind, but speed is crucial for off-wind trimming and mark roundings.

Typical boat length:
Small Boat: 22' - 28' (6.7 - 8.5 m)
Midrange: 29' - 34' (8.8 - 10.4 m)
Big Boat: 35' - 42' (10.7 - 12.8 m)

2:1/4:1 Swivel Base This system is often found on boats like J/24s where a center-mounted swivel base is desired. Diagram Ref. Description Small Boat Part No. Midrange Part No. Big Boat Part No. A Double 2602     B Single 2600     C Double 2634     D Cam base 402

3:1/6:1 This 3:1/6:1 two-speed system is used on boats end-boom sheeting and mainsails up to 22.3 m² (240 ft²). Diagram Ref. Description Small Boat Part No. Midrange Part No. Big Boat Part No. A Cross Block 400 400   B Fiddle 401 401

3:1/6:1 Swivel Base This 3:1/6:1 system allows the mainsheet trimmer to be positioned anywhere on the boat. A great setup for sportboats. Diagram Ref. Description Small Boat Part No. Midrange Part No. Big Boat Part No. A Single 2600 2600   B Double 2602 2602   C Double 2634 2634   D Cam base 402 402

4:1/8:1 Swivel Base Similar to the 3:1/6:1 swivel base system, but uses a 4:1/8:1 tackle for more power. Diagram Ref. Description Small Boat Part No. Midrange Part No. Big Boat Part No. A Double 2602 2602   B Cross block 400 400   C Double 2634 2634   D Cam base 402 402

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