S/C Yachts SC 420 User Manual

420 Instruction Manual – 2008 Edition

Introduction

The boat comes with all gear ready to sail, however there is a certain amount of assembly which we hope we can
cover in this instruction manual and through the tuning guide, that will make it much quicker to assemble and get your
S|C 420 on the water ready for sailing or racing.
All the parts come in the boats except the masts, which will be located in the container together. So after you find the
mast you must then open up your boat and assemble in any order that suits your requirements. In the below
information and also with the assistance of the tuning guide, you should be able to correctly set up each specific part
of the boat.

Mast

The mast comes with the adjustable spreaders and you will need to bolt these on (nuts and bolts provided), also put
the shroud in the spreader end using a screwdriver (position the shroud wire behind the bolt). Fasten the shroud and
the trapeze lines in with the T terminals before attaching the shroud to the spreader end. You will also need to feed
the ropes into the mast via the mouse line supplied, the best way to do this is to tape the two ropes together securely
prior to pulling the new line through. The spreader adjusters work very well and 1 full turn is equal to 5mm of pre bend.
To set these up originally I recommend pulling on a reasonable amount of tension, then step back 15 metres + and
line up the shroud wire just above the shroud adjuster and then compare the shroud/spreader position. Make these
even first before attempting to tune the rig, also I advise having more bend than required originally and then reducing
it once you are close to the tuning numbers on the rig tension and mast rake.

Rigging Pack

Below is a picture of the rigging pack supplied by Seldon. You will find in it the Topper and Topper Hook, the Main
Halyard, the Spinnaker Halyard, the Trapeze Wires, the Forestay and Forestay Halyard, the Shrouds, the Rig Tension
Strop, the False Forestay and lastly the Inner Forestay (to this the Forestay Spinner, is required to be added by
putting on above the swage and inserting the bolt, so it can’t come back off).

Boom

One boom is supplied as shown below, all gear should be on or in the boom. Set the vang slide to 625mm to the
centre of the slide from the back of the mast track. Set the front main sheet slide to 1385mm to the centre of the slide
from the back of the mast track, also have the second mainsheet slide set just behind the first one at the 1385mm
point.

Pole

One pole is supplied with the ends facing up. From the rope bag tie the pole rope on as the picture below shows, so
the rope hangs below the pole when being used.

Bow Attachments

Have the bow attachments, shackled as shown. Then tie on the false forestay elastic and the jib tack rope, then tie the
jib tack down as required.

Forestay Spinner and Jib Head

Shackle onto the forestay spinner and then use the rope for the jib head tie, to get the optimal position for your jib
every time you go sailing. You can use the long shackle or the short shackle, plus also use the supplied tie if required.
The position of the jib head should be approx 20mm from the bottom surface of the spinner. Below is a picture using
the long shackle (which we recommend with no tie).

Mast Base

The mast step bolt should be in the 6th hole from the back. The rig tension bolt should be in the 3rd hole from the back.

Spreader Length and Marks

The spreader length should be 505mm from side of mast to centre of shroud wire, this is the 5th pin hole position. Mark
the spreaders every two cm’s from the centre of the shroud wire, this can be used for the jib trim with regard to the
leech settings.

Trapeze System

The trapeze ropes and blocks are pre assembled, in the fitting bag. Once you get them out, shackle them on the
trapeze wires and hook them onto the trapeze elastic loops as shown, by feeding the elastic bowline through the hole
and over the edge of the ring.