**Problem 6.** Jim Hall's Chaparral 2F sports-racing cars in the 1960’s pioneered the use of airfoils mounted above the rear suspension to enhance stability and improve braking performance. The airfoil had an effective width (or span) of \( b = 6.0 \, \text{ft} \) and chord length of \( c = 1.0 \, \text{ft} \). The angle of attack varied between \( \alpha = 0^\circ \) and \( \alpha = -12^\circ \). The shape was similar to that of a NACA 23015 conventional airfoil. For a car speed of \( U = 90 \, \text{mph} \) on a calm day and \( \alpha = -12^\circ \), estimate (a) the downward force and (b) the increase in braking force, \( \Delta F_B \), produced by the airfoil accounting for "induced drag" for the finite wing and assuming a friction coefficient of \( \mu_k = 1.0 \).

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Description: **Problem 6.** Jim Hall's Chaparral 2F sports-racing cars in the 1960’s pioneered the use of airfoils mounted above the rear suspension to enhance stability and improve braking performance. The airfoil had an effective width (or span) of \( b = 6.0

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Problem 6. Jim Hall's Chaparral 2F sports-racing cars in the 1960's pioneered the use of airfoils mounted above the rear suspension to enhance stability and improve breaking performance. The airfoil had an effective width (or span) of b = 6.0 ft and chord length of c = 1.0 ft. The angle of attack varied between a = 0° and a = -12°. The shape was similar to that of a NACA 23015 conventional airfoil. For a car speed of U = 90 mph on a calm day and a = -12°, estimate (a) the downward force and (b) the increase in breaking force, AFB. produced by the airfoil accounting for "induced drag" for the finite wing and assuming a friction coefficient of µ; = 1.0.

Problem 6. Jim Hall's Chaparral 2F sports-racing cars in the 1960's pioneered the use of airfoils mounted above the rear suspension to enhance stability and improve breaking performance. The airfoil had an effective width (or span) of b = 6.0 ft and chord length of c = 1.0 ft. The angle of attack varied between a = 0° and a = -12°. The shape was similar to that of a NACA 23015 conventional airfoil. For a car speed of U = 90 mph on a calm day and a = -12°, estimate (a) the downward force and (b) the increase in breaking force, AFB. produced by the airfoil accounting for "induced drag" for the finite wing and assuming a friction coefficient of µ; = 1.0.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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**Problem 6.** Jim Hall's Chaparral 2F sports-racing cars in the 1960’s pioneered the use of airfoils mounted above the rear suspension to enhance stability and improve braking performance. The airfoil had an effective width (or span) of \( b = 6.0 \, \text{ft} \) and chord length of \( c = 1.0 \, \text{ft} \). The angle of attack varied between \( \alpha = 0^\circ \) and \( \alpha = -12^\circ \). The shape was similar to that of a NACA 23015 conventional airfoil. For a car speed of \( U = 90 \, \text{mph} \) on a calm day and \( \alpha = -12^\circ \), estimate (a) the downward force and (b) the increase in braking force, \( \Delta F_B \), produced by the airfoil accounting for "induced drag" for the finite wing and assuming a friction coefficient of \( \mu_k = 1.0 \).

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