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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 slopeThe 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

Answer»

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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