Final - AOE 3104 Aircraft Performance Final Exam Solution...

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- 1 - AOE 3104 – Aircraft Performance Final Exam Solution Problem 1 (5 points): /5 What is a hybrid airship? (A one sentence description is a sufficient answer) The combination of a heavier than air (HTA) vehicle and a lighter than air (LTA) vehicle – i.e. the combination of an airplane (or helicopter) and an airship An airship with wings – Not all hybrid airships have conventional wings (e.g. lifting body shapes), but this is an acceptable answer as the focus of the guest lecture was hybrid airships with wings Problem 2 (40 points): /40 Max rate of climb (RoC max ) at sea level = 88.1 m/s Max rate of climb (RoC max ) at 5 km = 51.6 m/s Maximum turn rate ( ψ & ) = 20.5 deg/s Minimum turn radius (R min ) = 313 m Will the aircraft be able to sustain the turn? Yes (since during the turn, the drag is less than the thrust available from the engines of the aircraft) Problem 3 (30 points): /30 Maximum range (R max ) = 2729 km Maximum endurance (E max ) = 6.24 hr Problem 4 (10 points): /10 Spanwise efficiency factor (e) = 0.827 Problem 5 (15 points): /15 Induced drag coefficient (C D,i ) = 0.00322 Induced drag (D i ) = 664 N TOTAL = /100 Altitude SL 1.5 km 5 km 8 km Density (kg/m 3 ) 1.225 1.058 0.736 0.525 Table 1: ISA atmospheric conditions
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Problem 2. (40 points) A twin-engine jet aircraft has the parameters shown below: Weight Planform area Aspect ratio Profile drag coefficient Spanwise efficiency factor Maximum thrust (for both engines combined) W=103kN S = 47 m 2 AR= 6.5 C Do = 0.032 e = 0.87 TSL = TO,SL = 80.6 kN a) Find the maximum rate of climb (RoC max ) in m/s at sea-level conditions.
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