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From US Sailing - Sail Shape when sailing on a reachWhat does it mean for a sail to be "flat"?
For maximum efficiency a sail should have a curve, or draft. The larger the draft or curvature of the sail usually creates a more powerful sail. In moderate wind conditions, the draft should beapproximately 45% of the way back from the luff (front edge of the sail), much like a wing of an airplane. In light winds, the mainsail should be set for maximum efficiency. The larger the draft or curvature of the sail usually creates a more powerful sail. However, in stronger winds it may be desirable to flatten the mainsail.
Flattening the curvature of the sail will make it less aerodynamic and reduce the pull on the leeward side of the sail. This can be done by tightening the . . . the outhaul [and uphaul – or cunningham, if so equipped]…
Probably mixing apples with oranges, comparing the recreational sail cut at one sailmaker to the racing sail at another.I saw on another thread that the NP sail is flatter than the North sail. This may have been only one person's opinion.