Daniel By: Moore [e-mail]
MEM 425: Aircraft Performance & Design
Home work #2 (due 10/08/09) Relevance to Program Outcomes a-k : a, e, k --------------------------------------------------------------------------------------------------------1. Consider an aircraft with the following characteristics: Wing span, b Wing area, s Normal gross weight, w Parasite drag coeff. Oswald efficiency factor, K Propeller efficiency, Sea-level air density, p = = = = = = = 35.8 ft. 174.0 ft2 2950 lb 0.025 0.8 0.8
2.3769*10-3 slugs ft-3
a. and Compute plot (Thrust_reqd .vs. Velocity) and (Power_reqd .vs. Velocity) in a cruise flight (level, constant velocity, constant altitude) at sea level. From these plots determine the minimum required thrust and power, and the corresponding velocities. Denote these velocities by and . b. Compute these (optimal) velocities using appropriate equations from notes or text. c. Repeat (a) and (b) for these altitudes {10,000; 20,000; 30,000} ft. d. Generate and plot and . For smooth plots you need to consider more number of altitudes.