41. I was only talking about its twin turbofan design. 42. The T55 also serves as the core of the Lycoming ALF 502 turbofan . 43. The aircraft were powered by two Pratt & Whitney TF30 afterburning turbofan engines. 44. Most modern jet engine designs are turbofans , which have largely replaced turbojets. 45. On turbojet and turbofan airplanes, the outboard engines are usually equally critical. 46. A modern turbofan engine can operate at as high as 48 % efficiency. 47. Engines : Usually two CFM International turbofans mounted below and forward of the wings. 48. The powerful turbofan engines are extremely quiet and are located aft ofthe cabin bulkheads. 49. Turbofan engines were rejected due to their larger cross-section producing excessive drag.50. The first General Electric turbofan was the aft-fan Lunar Landing Research Vehicle.
