With chord depths the same the location of maximum draft changes the leading edge angle

Figure 6.9

Figure 6.9

Wide

Chord Depth in the Same Place

Sails with a fine entry will end up flatter if the area of maximum draft is in the same place as a sail with a wide entry.

Wide

Chord Depth in the Same Place

Sails with a fine entry will end up flatter if the area of maximum draft is in the same place as a sail with a wide entry.

Figure 6.10

Wide

Area of Maximum Chord Depth

Figure 6.10

Area of Maximum Chord Depth

Wide

Sails with a fine entry will end up having the draft further aft than a sail with a wide entry if both sails are to have the same chord depth.

Sails with a fine entry will end up having the draft further aft than a sail with a wide entry if both sails are to have the same chord depth.

Figures 6.9 and 6.10

To keep the chord-depth ratios the same, the sail with the fine entry will end up having the area of maximum draft further aft while the draft will be forward with a rounder entry.

a rounder entry (Figure 6.10). It is at this point that sail design becomes a delicate balance of competing interests since pointing ability is a good thing, but the draft-aft sail increases drag and runs the risk of having the flow stall over the leeward side of the sail, especially toward the leech. This means it will be more difficult for the helmsman to steer the boat to the sails, since even the smallest mistakes will result in a loss of aerodynamic efficiency. A round entry, on the other hand, might not allow the boat to point as close to the wind as a fine entry, but the maximum camber will be forward, increasing lift and reducing drag with a flatter leech section. Because this sail is less likely to stall, steering does not need to be so precise, which will make life much easier for helmsman. Unfortunately, there is a bit of a dichotomy here since flat sails are generally desirable when the wind is fresh and the waves are kicking up - precisely the time when helming is the most difficult. In fact, what you really would like for these conditions is a sail with a rounded entry, but unfortunately those sails end up being full and inappropriate for strong winds. There will be more on this dilemma and trimming your sails accordingly in the chapter on sail trim. For now understand that the sail designer has to think about these differences and design the sail with them in mind.

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