As a designer we need to design a single engine fighter A/C having circular nozzle exhaust. Most appropriate control station for nozzle exhaust is ________

triangular

elliptic shape

circle with nozzle exhaust diameter

square of circle diameter

Correct Answer : circle with nozzle exhaust diameter

Explanation : Control station are the original cross-section which are required to complete the lofting process. Here, our main body is nozzle which has circular cross-section. Hence, original shape required to loft this nozzle will be circular also. Hence, control station should be circle with similar diameter as the nozzle.

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If for a given fuselage S_top=10m², A_side=14m², L = 10m then, find the ratio of wetted area to the volume of fuselage.

3.42 per m

4.001

6.68 per m³

8.36 m

Correct Answer : Option (A) : 3.42 per m

Explaination : Given, S_top=10m², A_side=14m², L = 10m.
Now ratio of wetted area Aw and volume V is given by,
Aw/V = 2*L*(S_top + A_side) / (S_top*A_side)
Aw/V = 2*10*(10+14) / (10*14) = 20*24/140 = 3.42 per m.