For a new sailboat, a designer wants to determine the drag force that may be expected at a given speed. To do so, she places a model of the proposed hull in a test channel and uses three cables to keep its bow on the center-line of the channel. Dynamometer readings indicate that for a given speed, the tension is 35 lb in cable AB and 40 lb in cable AE. The drag force is exerted in the direction of Flow at point A. -7 ft 1.5 ft B a 4 ft Flow A 4 ft E What is the magnitude of the drag force in Ib? What is the magnitude of the tension force in cable AC in Ib? What is the angle a in degrees measured CCW from the vertical? What is the angle B in degrees measured CW from the vertical?

■ Consider a symmetric the aerofoil at an AOA, α. Apply thin aerofoil theory and show that the vorticity distribution is given by, y(0) = 2a√∞ (1+ cos 0) /sin 0 ■ Hence show that the circulation is, 1 And that the lift per unit span is: L= pV_r=2π pVac ■ What is the lift coefficient C/ ? ■ Show that the moment coefficient about the leading edge is: Cm.le = -0.25c₁

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