The number two engine is installed in the aft fuselage. Like the wing engines it is a 50,000 pound thrust Rolls Royce engine. Its inlet is a curved "S" duct which provides performance equivalent to that of a straight through duct.
There are several advantages to using an "S" duct. First, this lowers the No. 2 engine, which gives a low center engine thrust line, reducing pitch up tendencies. Second, the lower engine allows for a one piece rudder which gives improved effectiveness. The "S" duct design also reduces aircraft weight. The engine is mounted in the aft fuselage, eliminating the need for heavy structural supports (up to 800 lbs.). Those supports, if would be used, would reduce the passenger cabin by 64 square feet, or 11 seats.
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