Correct Answer : Buttock plane is at a distance of 40 unit from fuselage centerline
Explanation : Butt-planes or buttock planes are defined as vertically oriented cuts which are used for fuselage lofting verification. It cuts from the horizontal intersection of the A/C with vertical planes. These planes are defined by their distance from centerline. Hence, butt-plane 40 can be interpreted as butt plane is at distance of 40 unit from aircraft centerline.
Correct Answer : Option (A) : 3.42 per m
Explaination : Given, Stop=10m2, Aside=14m2, L = 10m.Now ratio of wetted area Aw and volume V is given by,Aw/V = 2*L*(Stop + Aside) / (Stop*Aside)Aw/V = 2*10*(10+14) / (10*14) = 20*24/140 = 3.42 per m.
Correct Answer : Option (A) : 4m²
Explaination : Given, planform area = 2m².Since, wing is paper thin wetted are = 2*planform area = 2*2 = 4m².
Correct Answer : Option (B) : 16.16m²
Explaination : Given, Aw = 64.64m².Now, average projected area A = Aw/4 = 64.64/4 = 16.16m².
