embry ASCI310 4.7 - Assignment: Exercise 4

Exercise 4: Thrust Available

Given Aircraft Conditions:

Gross Weight for Cruise = 300,000 lbs

Wing Area = 3050 ft²

Wing Span = 156 ft

Wing Efficiency = .80

C_Dp = 0.0119

Twin turbofan engine Aircraft

Thrust @ sea level = 50,000 lb/per engine

Temp-Standard

Figure 2.1

Figures 4.3 and 4.5

Figure 5.1

Figure 6.5

1. Using Figure 6.5, find Thrust Available at 100 % RPM Max Endurance Airspeed at FL350 (Both Engines). Does the Thrust Available exceed the thrust required from Exercise 3?

2. Using Figure 6.5 (Equation 6.2), find the Total Fuel Flow (both engines) to maintain Max endurance speed in Level flight at FL350?

3. What would the % thrust and % N₁ setting be at Max Endurance Speed, FL350? Assume Thrust available from Problem 1,Thrust Required from Exercise 3, andin Equation 6.4 use 5.0 for x for turbofan engines.

4. UsingFigure 6.5, if you lost one engine, would you be able to maintain level flight at Max Endurance Airspeed at FL250?

5. How would the Altitude (FL350 as compared to FL250) affect the Induced and Parasite drag on the aircraft at constant true airspeed?