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This lecture covers the theory of lift in fluid dynamics, explaining the change in momentum of a fluid due to flow and its redirection. It discusses the principles behind lift generation, including equal transit time theory and the impact of fluid density. The instructor also explores the concept of lift in different mediums, such as air and water, and how it affects sailing boats. Additionally, the lecture delves into the design aspects of sailboats, focusing on reducing drag and optimizing lift using hydrofoils. The presentation concludes with a detailed analysis of the AC75 sailboat design, highlighting the use of hydrofoils to enhance lift and reduce friction.