What is meant by ’butt-plane 40’?(a) Buttock plane is at a distance of 40 unit from fuselage centerline(b) Buttock plane is at a distance of 20 unit from fuselage centerline(c) Buttock plane is at a distance of 80 from fuselage centerline(d) Buttock plane is at the 40° from fuselage centerlineThe question was asked in an interview for internship.Enquiry is from Configuration Layout in section Configuration Layout and Loft of Aircraft Design

What is meant by ’butt-plane 40’?(a) Buttock plane is at a distanc

1.	What is meant by ’butt-plane 40’?(a) Buttock plane is at a distance of 40 unit from fuselage centerline(b) Buttock plane is at a distance of 20 unit from fuselage centerline(c) Buttock plane is at a distance of 80 from fuselage centerline(d) Buttock plane is at the 40° from fuselage centerlineThe question was asked in an interview for internship.Enquiry is from Configuration Layout in section Configuration Layout and Loft of Aircraft Design
Answer» Right option is (a) Buttock plane is at a distance of 40 UNIT from fuselage centerline To explain: 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.

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