| 摘要 |
<p>An aircraft (6) having an elliptical fuselage (5) and low skin friction drag. The aircraft (6) includes (a) a lifting fuselage (5, 10) having a cross section constituting an airfoil in a majority of vertical planes taken parallel to the flight direction, and aspect ratio (ARf) of 0.33 to 1.10, a forebody having a substantially elliptic cross section (7) in all planes taken normal to the flight direction, and a substantially elliptic planform leading edge; (b) wings fixed to the fuselage (5, 10) having an aspect ratio (ARw) of at least 5.0; (c) a mechanism controlling aircraft attitude; and wherein the wings and fuselage (5) produce lift in varying proportions depending upon flight conditions as follows: (i) the aircraft (6) has a cruise design point in which the fuselage lift coefficient (CLF) is 0.08 or less, and (ii) the fuselage lift coefficient is at least 0.50 at an angle of attack (αLZo) of 10°, in level flight at sea level (ISA) with all movable left enhancing devices retracted.</p> |
