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Buttock-planes are used to __________

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Buttock-planes are used to __________

(a) evaluate the smoothness of A/C fuselage

(b) evaluate Lift

(c) find lift curve

(d) find lift curve slope

The question was posed to me by my college director while I was bunking the class.

Enquiry is from Configuration Layout topic in portion Configuration Layout and Loft of Aircraft Design

1 Answer

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Correct option is (a) evaluate the smoothness of A/C fuselage

Easy explanation: Buttock planes or butt planes are vertically oriented cuts which can be used to find smoothness of the A/C fuselage. Lift curve slope is found by using lift and AOA. Lift can be estimated by measuring pressure difference between upper and lower surface.

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