Block Configurations - Ash Blocks (stainless bindings)

Confusion quite often reigns, so a few words of explanation might help here.

With blocks, the "number" ie single, double, treble and so on refers to the number of sheaves (pulley wheels, if you must!).

If the binding - in these cases the metal bit, extends past the shell of the block, it forms a "becket" to which you can attach the end of the rope.

And that gives you the basic variations eg double, single & becket etc.

 

 

     

 

   

 

   

 

   

Specifications

Shell Size

Rope Dia

Sheave Dia

Sheave width

SWL

3”

8-10mm 40mm 12mm 1500kg

3½”

10-12mm 50mm 14mm 1750kg

4”

12-14mm 60mm 16mm 2000kg

Winch Selection Guide

 

 
Mainsail Area (ft2/ m2) 120/11 150/14 180/17 210/20 250/23 325/30 750/70  
Genoa Area (ft2/ m2) 200/19 300/28 350/33 470/44 575/53 825/77 1500/139  
Boat Length (ft/ m) 23/7 27/8 30/9 34/10 38/12 45/14 52/16  

Murray Winches

 
Main Halyard - 1 1 1/4 4/5 4/5 5

 

Genoa Halyard - 1 4 4 4/5 5 5/6
Genoa Sheets 1 4/5 4/5 5/8 5/8 8 8
Spi. Sheets etc - 1 1 1/4 4/5 5 5/6
Outhaul/Reefing - - - 1 1/4 4 4/5

Wilmex Winches

 
Main Halyard 8 8 10 10 25/26 31/40 40/41

 

Genoa Halyard 8 8/10 10/25 25/26 31/40/41 40/41/51 51
Genoa Sheets 8/10 10/26 25/26 31/40 40/41/51 51/70/71 70/71
Spi. Sheets etc 8 10 10 25/26 31/40 40/41/51 51/70/71
Outhaul/Reefing 8 8 8 10 10 25/26 40/41

Please note that the above figures are provided as an initial guide only

 

Rudder straps - bronze

The first dimension for the rudder straps gives the distance between the straps, the second the length of the straps. We supply rudder straps without fastening holes, since some need to match existing fasteners, others through-bolt, yet more use screws etc. etc.

 

     The boat lengths are only a very rough guide. 

Series

Approx max boat length

Depth of strap

Offset of pin

Pin Diameter

   1   

                      4.0m   3/4" 5/8 3/8

2

                      5.5m 1" 3/4 3/8

3

                      6.5m 11/4 1" 1/2

4

                     11.0m 11/2 1" ¾"

Transom fittings - bronze

                        

 

Horizontal

 

                 Vertical trabsom fitting

  

 Vertical

 

                 4 hole tansom fitting

4-hole

 

 

                     3 hole transom fitting

 

3-hole

         

Series 1 - craft up to about 4m length

 

Width

Depth

Pin Offset

Pin dia

Horizontal 21/8 3/4 5/8 3/8
3 - Hole 23/4 13/4 5/8 3/8

Series 2 - craft up to about 5.5m length

 

Width

Depth

Pin Offset

Pin dia

Horizontal 23/4 7/8 3/4 3/8
4 - Hole 21/4 13/4 3/4 3/8
Vertical 7/8 23/4 3/4 3/8
3 - Hole 31/8 21/8 3/4 3/8

Series 3 - craft up to about 6.5m length

 

Width

Depth

Pin Offset

Pin dia

Horizontal 31/4 11/4 1” 1/2
4 - Hole 31/4 2" 1” 1/2
Vertical 11/4 31/4 1” 1/2

Series 4 - craft up to about 11m length

 

Width

Depth

Pin Offset

Pin dia

Horizontal 51/8 11/2 1” 3/4
4 - Hole 51/8 25/8 1” 3/4

 

 

 

Using Wykeham-Martin Furling gears - an Unofficial Guide

Reefing versus Furling Gears