Hoerner [Ref. 12 of Chap. 7, p. 325] states that the drag coefficient of a flag of

Question:

Hoerner [Ref. 12 of Chap. 7, p. 3€“25] states that the drag coefficient of a flag of 2:1 aspect ratio is 0.11 based on platform area. URI has an aluminum flagpole 25 m high and 14 cm in diameter. It flies equalized national and state flags together. If the fracture stress of aluminum is 210 MPa, what is the maximum flag size that can be used yet avoids breaking the flagpole in hurricane (75 mi/h) winds? Neglect the drag of the flagpole.

Hoerner [Ref. 12 of Chap. 7, p. 3€“25]