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Lift and drag are components of the total aerodynamic force on sail ('''F<sub>T</sub>'''). Since the forces on the sail are resisted by forces in the water (for a boat) or on the traveled surface (for an ice boat or land sailing craft), their corresponding forces can also be decomposed from total aerodynamic force into driving force ('''F<sub>R</sub>''') and lateral force ('''F<sub>LAT</sub>'''). Driving force overcomes resistance to forward motion. Lateral force is met by lateral resistance from a keel, blade or wheel, but also creates a [[Sailing#Heeling|heeling]] force.
The tendency of the air to stay attached to the outside convex sail surface is explained as the [[Coandă effect]].<ref>
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The two sails cause an overall larger displacement of air perpendicular to the direction of flow when compared to one sail. They act to form a larger wing, or airfoil, around which the wind must pass. The total length around the outside has also increased and the difference in air speed between windward and leeward sides of the two sails is greater, resulting in more lift. The jib experiences a greater increase in lift with the two sail combination.
==Sail performance design variables==
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