Patent ID: 8783617

Claim:
An air vehicle fuselage adapted for transonic operation, the fuselage comprising: a body comprising a transition station at an aft end of the body, wherein a lower surface of the body has a first waterline value at the transition station; a close-out coupled to the body at the transition station, wherein a lower surface of the close-out has a waterline value that varies along a fore-aft direction of the fuselage and is equal to the first waterline value at the transition station and wherein the lower surface of the close-out connects to an upper surface of the close-out at an aft end of the close-out; and a drag-reduction blivet disposed on the lower surface of the close-out, the blivet comprising: a first region wherein the lower surface drops to a point comprising a third waterline value that is below the first waterline value and a first inward radius; and a second region disposed aft of the first region wherein the lower surface rises while having a second radius is equal to a minimum radius of the lower surface within the second region, the second radius being greater than the first radius.