| 摘要 |
<p>A substantially unswept wing (14, 26) that achieves the same cruise speed of Mach=0.78 as jet airplanes with higher sweep (1) with the same lift but lower velocities over the top (83) of the wing. With very low sweep and this type of cruise pressure distribution, natural laminar flow will be obtained with increased extent and heat will be transferred from the leading edge and the main flap. The slotted cruise wing airfoil (14, 26) allows modularization of the wing (14, 26) and the body (15, 27) for a family of airplanes. The unsweeping of the wing changes the manufacturing processes and reduces manufacturing costs and time from detail part fabrication to airplane delivery. A high wing arrangement (14) allows installation of higher bypass ratio advanced geared fan engines (17). A low wing (26) in conjunction with aft body mounted engines (29) will have a similar effect. Aerodynamic efficiency and engine fuel burn efficiency result in considerable lower emission of noise and greenhouse gases.</p> |
