[Sailormon6]

I get my best advice about sails from a good sailmaker. Tell them where you sail, how you sail (shorthanded or with crew), how your boat is rigged (masthead rig, furling jib, lines led aft, etc.) and your goals (racing, cruising, daysailing), and ask for their recommendations. The more information you provide, the better advice you will receive.

To sail in light air, you either need enough crew onboard to station on the lee rail and heel the boat to leeward, or you need a sail specifically designed for light air. The boat won't go anywhere if the sails are hanging limp. They only drive the boat when they are hanging in that smooth, aerodynamic shape. If you can make the boat heel, even relatively heavy sailcloth will hang in that shape. If the sail is made of lightweight sailcloth, the air movement can lift the sail into that aerodynamic shape with less force.

If you don't have enough crew to heel the boat, or, alternately, if you don't have a lightweight sail, then you can't sail in light air. Your sails will hang limp and not generate any drive.