0 [w]Z 5 1 emt日 0102030405060708090100 X [m] Figure 2:LAPCAT-M4 projection in the x-z-plane(nacelle design not representative) 2 10 5 0 5 -10 6 20 25 30 0102030405060708090100 X [m] Figure 3:LAPCAT-M4 projection in the x-y-plane Z N 0 -5 ELLLL 30 20 10 0 -10 -20 -30 Y [m] Figure 4:LAPCAT-M4 projection in the y-z-plane(nacelle design not representative) The large,slightly inclined wing might help to achieve a good maximum L/D of 7.8 at a small angle of attack and cruise Mach number 4.5 according to preliminary DLR-analysis.Actually,a high L/D is essential to achieve the ambitious range requirement. The total take-off mass of the supersonic cruise airplane has been iterated in the first loop to the huge value of 702.6 Mg [2]and has been recently slightly increased to 720 Mg,which is well beyond any supersonic passenger aircraft built to date.The dry mass is estimated at 184.5 Mg and the structural index is at a for airplanes low 36.8 % According to current data the LAPCAT-M4 would be able to transport about 200 passengers with their luggage.The 4 American Institute of Aeronautics and Astronautics Paper 2006-7984American Institute of Aeronautics and Astronautics Paper 2006-7984 4 Figure 2: LAPCAT-M4 projection in the x-z-plane (nacelle design not representative) Figure 3: LAPCAT-M4 projection in the x-y-plane Figure 4: LAPCAT-M4 projection in the y-z-plane (nacelle design not representative) The large, slightly inclined wing might help to achieve a good maximum L/D of 7.8 at a small angle of attack and cruise Mach number 4.5 according to preliminary DLR-analysis. Actually, a high L/D is essential to achieve the ambitious range requirement. The total take-off mass of the supersonic cruise airplane has been iterated in the first loop to the huge value of 702.6 Mg [2] and has been recently slightly increased to 720 Mg, which is well beyond any supersonic passenger aircraft built to date. The dry mass is estimated at 184.5 Mg and the structural index is at a for airplanes low 36.8 %. According to current data the LAPCAT-M4 would be able to transport about 200 passengers with their luggage. The