|Quoting Blackbird (Thread starter):|
I wonder if the blade-shaped tailcone design gave the CV-880 any drag reduction benefits over the B-707 and DC-8 design?
Hard to say without access to the aerodynamic data of the three aircraft types. In a way the B707 and DC-8 also have blade-shaped tailcone designs but are rounded off at top and bottom. Another factor that may be of influence is the position of the horizontal and vertical stabilizer relative to the tailcone trailing edge. Of the three types, the CV
-880/990 has the most aft positioned horizontal stabilizer with the elevator trailing-edge very close to the tailcone trailing edge. The B707 and DC-8 have their horizontal stabilizers/elevators a bit further forward relative to the tailcone trailing edge and closer to the vertical fin. Generally the 880/990 fuselage skin was smoother than the other two aircraft types.
B777, MD11 and MD
-80 all have a much more aft extended and higher blade-shaped tailcone than the 880/990, not to mention the T-tail MD