275
2:1/4:1
A
B
C
D
3:1/6:1
A
B
3:1/6:1
A
B
B
C
D
4:1/8:1
A
A
B
C
D
Mainsheet
Two-Speed Mainsheets
Part numbers represent hardware most commonly used.
2:1/4:1 Swivel Base: This 
system is often found on boats 
like J/24s where a center-mounted 
swivel base is desired.
3:1/6:1: This 3:1/6:1 
two-speed system is used 
on end-boom sheeting and 
mainsails up to 22.3 m
2 
(240 ft2).
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.
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.
Typical boat length:
Small Boat:  6.7 - 8.5 m (22 - 28')
Midrange:  
8.8 - 10.4 m (29 - 34')
Big Boat:  
10.7 - 12.8 m (35 - 42')
Diagram
Small Boat
Midrange
Big Boat
Ref.
Description
Part No.
Part No.
Part No.
2:1/4:1 Swivel Base
A
Double
2602
—
—
B
Single
2600
—
—
C
Double
2634
—
—
D
Cam base
402
—
—
3:1/6:1
A
Cross block
400
400
—
B
Fiddle
401
401
—
3:1/6:1 Swivel Base
A
Single
2600
2600
—
B
Double
2602
2602
—
C
Double
2634
2634
—
D
Cam base
402
402
—
4:1/8:1 Swivel Base
A
Double
2602
2602
—
B
Cross block
400
400
—
C
Double
2634
2634
—
D
Cam base
402
402
—

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