(Solved): Need Help with 3-5 please!! Consider a Cessna 172 Skyhawk with wing area, \( \mathrm{S}=16.2 \mathr ...

Need Help with 3-5 please!!

Consider a Cessna 172 Skyhawk with wing area, \( \mathrm{S}=16.2 \mathrm{~m}^{2} \), and wingspan, \( \mathrm{b}=11 \mathrm{~m} \), flying at shaft power, \( \mathrm{P}=160 \mathrm{hp} \), mass, \( \mathrm{m}=2,000 \mathrm{lbm} \), and velocity, \( \mathrm{v}=120 \mathrm{kts} \), at an altitude of \( 8,000 \mathrm{ft} \). 1) Assume a propulsive efficiency of \( \eta=80 \% \). What is the thrust? 2) Equate total drag (base drag + induced drag) with thrust. For an Oswald efficiency factor of e=0.8, what is the base drag coefficient, \( c_{0,0} \) ? 3) Based on the \( c_{0,0} \) from (2), what is the maximum lift-to-drag ratio? 4) For the (L/D) from (2) and a power-specific fuel consumption of \( C=6.2 \times 10^{-7} \mathrm{~N} /(\mathrm{Ws}) \), after flying a distance of \( 240 \mathrm{~nm} \) (no wind), what is the mass of the aircraft? What is the flight time in hours and the fuel burn in gal/hour ( \( 1 \mathrm{gal}=6 \mathrm{lb} \) of fuel)? 5) Prepare a graph of power, \( P \), over speed, v. Explain the observed behavior of the power curve. In the graph indicate the velocity for minimum power consumption (=maximum endurance or loiter time).