Which of the following is correct in terms of the wing layout with twist?

Only untwist airfoils can be used for layout

Only rotation of chord line is required at c/6 points

Only chord line should be rotated by reducing length of chord

Incidence at each span station must be considered and chord should be rotated accordingly

Correct Answer : Incidence at each span station must be considered and chord should be rotated accordingly

Explanation : In general, airfoils are drawn to find the complete wing layout. When wing has some twist then, we need to find incidence at each span station in order to include effects of twist. Also chord needs to be rotated accordingly before drawing an actual airfoil for lofting.

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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.