Originally Posted by Psychosaffa
i purchased a wee 20ft trailer sailer. the problem i have is that the majority of standing and running rigging
has gained legs and disappeared, apart from the forestay. every cloud and all that. anyways, what is the best method to get the correct measurements for new rigging
? do i just hoist the mast
with ropes and measure from there? what size turnbuckles would you guys suggest?
all advice is greatly appreciated.
Basically, you measure up with a tape measure. Then you attach the rigging to the mast
and spreaders but making the wires over length by a safety
margin of maybe 3' and not fitting the rigging screws at the bottom just yet. Then you lift
the mast using ropes to hold it up. Using a tape measure at the hounds ( where the upper shrouds meet up the mast) you measure down to the chainplates at each side and adjust the ropes on the mast until it is straight with the same measurement on each side and a slight rake aft on the mast. Then adjust each rigging screw out to a little longer than halfway ( say 3/4 out) and mark where each wire should be cut; importantly allowing enough length for the swage depending on the type. Each wire should be exactly the same length as its companion on the other side so you might have to lower the mast after swaging the rigging screws on one side. Then measure and cut / swage the other side. Finally with the mast raised again you use the tape measure ( with a thin downhaul line) tied to a sail slide and held up by the halyard
and measure down to the chainplates again and tension so each wire including the lowers are the same measurement on each side. Often trailer sailers have a fractional rig for lightness. That is, there is unstayed mast above the rigging. Often in that case it's a good idea to have the lower shrouds a little looser than the uppers. This allows the mast to bend forward a little in the middle. That will flatten the mainsail
in stronger winds and help the trailer sailer sail faster and not heel as much.
The turnbuckles ( rigging screws) will be an appropriate size for the wire used. The size of wire used will depend on the mast fittings. If in doubt ask the suppliers of the rigging wire and rigging screws. Check another boat of the same design if you can.