Question: I've noticed spreader and stanchion patches listed as an option on the AirForce Sail quoter... what are they?

Answer: Spreader and stanchion patches are pieces of self adhesive ("sticky back") dacron, that are applied to both sides of headsails where the sail rubs against the ends of the spreaders and the lifeline stanchions, while beating upwind and while tacking. This is to protect the sail from damaging chafe at these spots.

In order to position these accurately, the boat owner has to hoist the sail on the boat and sheet it home to proper upwind trim, in order to see where these patches need to be. That is why they are provided loose with the sail. It is not generally advisable to try to position these without first hoisting the sail, as they often end up slightly misplaced if we try to figure out the correct positions based only on a 2D drawing or even a proper scale sail plan.

It is also a good idea to have this type of patching where the mainsail rubs against the rigging when eased out on a run, especially where full length battens contact the shrouds.