Mainsheet Systems

Mainsheets are simple hardware systems, but are among the most important as they are in almost constant use.

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)

 

4:1 Fiddle

This 4:1 tackle is the most common system on boats under 28 ft (8.5 m).

main1.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Fiddle 2621 2690 1559
B Fiddle 2676 2697 1566

 

6:1 Reeved Right Angle

Boats with mainsails to 375 ft2 (35 m2) often use a 6:1 system.

main1a.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Triple 2604
2664 1546
B Triple 2141 2686 1556

 

8:1 Beachcat

This 8:1 purchase handles high mainsheet loads on Beachcats up to 20 ft (6 m).

Main1b.gif
Diagram
Ref.
Multihulls 8' - 14'
(2.4 - 4.3m)
15' - 20'
(4.6 - 6m)
21' - 30'
(6.4 - 9m)
A Quad 2654 2631 2677
B Triple 2619 2632 2687

 

4:1 Swivel Base

Position the swivel base block off the traveler car to allow mainsail adjustment without dragging the car to windward in light air. To avoid tightening the leech, curve the track ends up.

main2.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single 2600 2660 1540
B Single 2601 2661 1541
C Single 2135 2670 1549
D Cam base 205 144 1574

 

4:1/16:1 Gross/Fine

This powerful gross-trim/fine-tune cascading system allows crew to use the 4:1 gross-trim for most trimming and the 16:1 fine-tune for precise adjustments.

4-1-16-1dble-GF_mainsheet.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single 2636 2600 2660
B Double 381 2642 2602
C Fiddle 2658 2676 2697
D Fiddle 2675 2696 1565

 

4:1/16:1 Double-ended Fine Tune

This 4:1/16:1 system uses a dinghy-like double-ended tackle that locates the sheet ends on the cockpit sides.

4-1-16-1dble-FT_mainsheet.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single 2636 2600 2660
B Single 2135 2135 1549
C Cam base 205 144 1574
D Double 342 2638 2602
E Single 349 2652 2600
F Cam cleat 471 471 150

 

6:1/24:1 Gross/Fine

This 6:1/24:1 cascading system is used on boats with end-boom sheeting and mains as large as 275 ft2 (25.5 m2) and end-boom sheeting.

main3.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Double 2638 2602 2662
B Triple 2647 2629 1555
C Single 2636 2600 2660
D Fiddle 2655 2621 2690
E Fiddle 2676 2676 2697

 

6:1/24:1 Cascaded

This 6:1/24:1 system is used on boats with mains as large as 275 ft2 (25.5 m2) and end-boom sheeting.

main-gt15.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Triple 2640 2604 2664
B Triple 2617 2629 2685
C Double 2638 2638 2602
D Fiddle 2658 2658 2676

 

7:1/28:1 Gross/Fine

This gross trim/fine tune system is found on racing multihulls where it is desirable to split the gross trim from the fine tune. Placing the fine tune in the boom provides a very clean system that the trimmer can get a hold of and put his weight into it. The powerful cascading fine tune portion is used to haul the boom in that last little bit.

7-1_28-1_intrnl-finetune_mn.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single  — 2600 2660
B Triple  — 2629 2685
C Straphead  — 2650 2650
D Triple  — 2604 2664
E Fiddle  — 2655 2621
F Cheek  — 2644 2606
G Thru-deck  — 046 047
H Pivoting exit  — 140 140

 

4:1 with Dedicated Winch

This system moves the traveler over the companionway to clean up the cockpit. A favorite on cruising boats.

main4-1_winch.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single  — 2660 3215
B Fiddle  — 1559 3241
C Single w/becket  — 2661 3216
D Footblock  — 1548 3220
F Winch  — 40.2STA   46.2STA

 

5:1 with Dedicated Winch

This system is popular on cruising boats with cabintop travelers. The sheet leads forward to the gooseneck and then down and back to a winch on the aft edge of the cabintop.

main6.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single 2660 1540 3231
B Fiddle w/becket 2691 1560 3242
C Footblock 1548 1548 3234
D Winch 35.2STA
46.2STA 46.2STA

 

2:1 with Dedicated Winches

This simple double-ended system lets the mainsheet run freely through the blocks which allows the traveler car to move easily. The trimmer makes sail adjustments from the high side.

main7.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single  — 1586 3231
B Single  — 1540 3215
C Footblock  — 1548 3220
D Winch  — 40.2STA 46.2STA

 

Admiral's Cup 2:1 with Dedicated Winch

In this system, the traveler is independent of the mainsheet so it rolls freely. The sheet leads forward along the boom before it turns down and aft to winches. Used on race boats like the Farr® 40.

main8.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Double   1544 3233
B Single   1586 3246
C Single   1540 3231
D Footblock   1548 3234
B Winch   35.2STA 46.2STA

 

3:1 with Dedicated Winch

Many large boats use this simple 3:1 system. A block on deck turns the sheet to a winch.

main9.gif
Diagram
Ref.
Description Small Boat
Part No.
Midrange
Part No.
Big Boat
Part No.
A Single w/becket  —
 — 3247
B Single  —  — 3246
C Stand-up  —  — 3254
D Winch  —  — 46.2STA

 

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