Staff Writer (Updated: 3/20/2016):
As it stands today (2013), the TFX resides in three distinct conceptual forms. The foremost favored by the Turkish Air Force is a single-engined airframe with blended wing-to-fuselage lines, a forward-set single-seat cockpit and conventional main-and-tail wing appendages (as in the F-22's unique "diamond" shape). The lean towards a single-engined fighter would ease logistical commitments to the aircraft in both short-term procurement and long-term maintenance costs. The second concept largely borrows the same design though it features a larger fuselage to house the two required turbofan engines within a blended wing/fuselage design. All other facets of the concept remain faithful to the single-engined design. Of course a commitment to a twin-engined fighter would increase procurement costs and maintenance costs over the life of the aircraft though, in turn, providing higher performance and additional internal weapons bays. The third - and most radical - of the concepts becomes a canard-delta planform along a single-engined fuselage intended for high agility handling - similar to the Saab Gripen or Dassault Rafale.