Consider a general aviation airplane with weight 10 kN and a wing planform area
of 15 m 2. The drag coefficient of the airplane is given as
0
2
D D LC C KC=+ with
0
0.025DC =
and
0.05K = . For level flight at an altitude where the density is
0.60 kg/m3 and thrust 1 kN, the maximum cruise speed is
(rounded off to the nearest integer)
Options:
(A) 87 m/s
(B) 30 m/s
(C) 36 m/s
(D) 101 m/s
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2023 Q.40)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Incompressible & Compressible Aerodynamics** under *Aerodynamics & Fluid Mechanics* (2 Marks, MCQ).
**2. Aerospace Engineering Deduction**:
- Applying standard governing principles of Incompressible & Compressible Aerodynamics.
- Option **(A)** matches the analytical derivation and official criteria.
**3. Final Answer**:
Correct Option is **(A)**.
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