Here’s a link to the MC Scow Tuning Guide for Quantum Sails.
MC Scow Tuning Guide for Quantum Sails – Highlights
- Spreader sweep. Quantum recommends spreader sweep between 2 – 3.5″. This is significantly less than the typical range of 3.5 – 4.5″. The guide says to go closer to 2″ if you use a lot of vang, and closer to 3.5″ if you use less vang. Less sweep reduces mast bend which allows you to carry more power.
- Shroud tension. Quantum recommends looser shrouds in light air and very tight shrouds in heavy air.
- Mainsheet tension. Use the mainsheet to position the top batten and regulate flow off the upper leech:
- Light air – top batten falling off to leeward of the boom 5+ degrees; top leech tale streaming 75% of the time.
- Medium air: top leech tale streaming about 50% of the time. Use mainsheet tension and vang to make the leech more stiff.
- Heavy air: top batten falling off 5 degrees, eased more in puffs. Leech tales will always be streaming.
- Vang tension – good discussion about easing the vang a little in really big breeze to let the leech open up.
- Traveler – good discussion about using the traveler.
- Outhaul – reminds us to use the outhaul as the breeze changes.
- Cunningham – makes the point that you can never have too much cunningham in the biggest breeze.
The tuning guide also contains some basic speed tips, such as use of shroud telltales, angle of heel, and heeling the boat to leeward when sailing upwind in light air.