- Nov 8, 2010
Huh?? That is EXACTLY how lift works in sail.BTY: Someone earlier suggested the concept of lift was difficult. I would suggest the only reason it is difficult, is that every diagram trying to explain it, is simply wrong. All diagrams show lift with the arrow on the leeward part of the sail, which implies something (wind) is grabbing onto the sail and pulling it. Lift always comes from the windward side and is pushing against the sail. What happens on the leeward side is only an absence of pressure.
The lift force vector is absolutely on the leeward side of the sail. The fact that is ahead of the beam allows the boat to move forward.