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Modifications to Mainsheet Fairlead on the Phantom Yacht

Rudders Chain Plates Mast fitting for shrouds forestay Mainsheet fairlead Water proofing the hatch Improving Ballast Replacing Shrouds 'B' rig sails Radio Setup Clew/Tack Adjustment Improved sheeting system Gooseneck repair

 

One of the most important controls for a sail is the clew adjustment.  It's primary function is to control the draft in the sail by moving it along the boom - towards the mast will increase the draft increasing drive (and heeling force) but at the expense of pointing - away from the mast decreases draft decreasing drive (and heeling force) but enabling it to point higher.  In addition in the Phantom as initially set up with a fixed vang, it can be used to adjust the twist in the sail by increasing or decreasing how much the clew is pulled towards the boom.

The simplest arrangement I have seen is that done by Richard G.  Does this explain his excellent boat speed?  Maybe!

Examining this close up shows the two adjustments each independent of of the other.   Moving the cable tie (how good are they!) and ring along the boom adjusts only the draft as the loop of line through the clew moves with it leaving the height the clew is above the boom constant so leaving the sail twist (leech tension) constant.  Adjusting the line but leaving the cable tie in position adjusts the leech tension hence sail twist while leaving the draft constant.  In addition, when changing sails to 'B' rig the line is easily released and fed back through the new sail clew.

 

Notice that Richard has also replaced the original fitting to tie off the liner with a brass stepped fitting or cleat.  The cleat has a hole through which the line passes and a slot into which the line lays.  A series of knots in the line allows for adjustment. 

This is not essential for the above process to work as the original fitting will work fine or a bowsie or even another cable tie would also work.

 

Ben's method uses wire bent around the boom so it can slide along it with two hooks one to go through the sail clew and the other to sit in holes drilled in the top of the boom 2mm apart.  This last hook is held in place by a cable tie which slides over the wire and holds the hook in place. 

 

To assist in the changing of rigs, all corners of the mainsail must be adjustable and readily reset with the new sail.  The tack is most easily done with a metal hook such as a fishing clip and bowsie for adjustment (picture to come soon).  To facilitate the replacement of the lines at the head of the sail it is easiest if a larger hole is available in the mast crane or a ring supported below the crane to readily feed the line which tensions the sail luff through.

The 'B' rig jib replacement is easier in some ways as it comes with its own boom and its associated sail adjustments using bowsies or cable ties.  The tricky part is in making the jib sheet readily fixed to and removed from either boom.  One way is to use a fishing clip on a short loop attached to the boom by a cable tie allowing ready adjustment by sliding the cable tie along the boom and easy removal of the sheet with the fishing clip.

The jib clew is best done by two loops of cord - one fixed that holds the sail clew down near the boom and one which loops around the end of the boom and back to a loop held in place by a cable tie.  The cable tie can be slid along the boom to adjust the foot curvature

Note the topping lift on the jib boom - an essential addition to all jibs to allow the slot to be adjusted when the wind isn't strong enough to blow it out.

page last edited on 24/04/2012