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EG2100 Engineering Design II - Aerospace (PRD1 A 2025/26)
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The design parameters of your wing are as follows:
Mid-chord (or shock) Mach number: 0.7
Cruise Mach number: 0.86
Aspect ratio: 8.59
'Uncranked' taper ratio λu: 0.42
Crank extent ηc: 0.22
Crank sweep λc: 8 degrees
Enter your mid-chord sweep angle to the nearest 0.1 degree:
Re-cap - mission & aircraft data:
- Design range 3285 nm
- Maximum payload 36629 kg
- Average L/D during cruise = 18.1 (NB Not best L/D!)
- sfc = 0.50 lb/h/lbf
- cruise Mach = 0.79 at 35,000 ft
- OWE = -1530 + 0.47 * MTOW (weights in kg)
Q: What is the ESAR in m?
NOTE: DO NOT MOVE ON TO THE NEXT PAGE WITHOUT ANSWERING THIS FIRST QUESTION!
Estimate the maximum take-off mass in kg for an aircraft with:
Design range 3285 nm
Maximum payload 36629 kg
Average L/D during cruise = 18.1 (NB Not best L/D!)
sfc = 0.50 lb/h/lbf
cruise Mach = 0.79 at 35,000 ft
OWE = -1530 + 0.47 * MTOW (weights in kg)
What is the cruise speed in m/s, to 1 d.p.?
What is the s.f.c. in kg/s/N, to 4 s.f.?
Re-cap - mission & aircraft data:
- Design range 4368 nm
- Maximum payload 53840 kg
- Average L/D during cruise = 18.1 (NB Not best L/D!)
- sfc = 0.58 lb/h/lbf
- cruise Mach = 0.82 at 35,000 ft
- OWE = 2384 + 0.46 * MTOW (weights in kg)
Q: What is the ESAR in m?
NOTE: DO NOT MOVE ON TO THE NEXT PAGE WITHOUT ANSWERING THIS FIRST QUESTION!
Estimate the maximum take-off mass in kg for an aircraft with:
Design range 4368 nm
Maximum payload 53840 kg
Average L/D during cruise = 18.1 (NB Not best L/D!)
sfc = 0.58 lb/h/lbf
cruise Mach = 0.82 at 35,000 ft
OWE = 2384 + 0.46 * MTOW (weights in kg)
Q7 Now set the RRC to zero and re-calculate the required Tsls/MTOW (to 3 d.p.) at a design wing loading of 6,000 Pa.
Recap:
Consider an aircraft with the following aerodynamic & mission specification:
- CD0 = 0.0172; k = 1.18; AR = 9.7
- Cruise Mach = 0.88 at 38,000 ft
- Throttle setting 78%
- Cruise weight = 0.94 % MTOW
- Residual rate of climb allowance = 2.2 m/s
Q4 What is the cruise thrust factor (T/Tsls) at 38,000 ft, to 3 d.p.?
Q5 What is the dynamic pressure (at Mach 0.88, 38,000 ft), to the nearest Pascal?