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Fig. 2. Diagram of sectional flow velocities. The wing is travelling through the fluid at forward velocity Vf. (A) Downstroke. The wing is sweeping into the incident flow. The magnitude sectional flow velocity at wing position r is given by r +Vfcos({varphi}). (B) Upstroke. The wing is sweeping with the incident flow. The flow velocity at wing position r is given by –r –Vfcos({varphi}).





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