7 Flight Mystery and Aerodynamic Principles
477
Fig. 7.37 Plane shape of the wing
order to suppress shock waves, generally adopting a conventional swept-back
lower wing (large lift-to-drag ratio, good economy, low cabin noise, and wide
field of view), placing goods in the lower half of the fuselage; for fighters,
most of them use medium or lower single-wing, delta wing, conventional or
canard layout with large sweep angle (fast speed, low drag, flexible maneuver
and large stall angle of attack).
For example, the American tactical transport aircraft C-130 (as shown in
Fig. 7.38) has a cruising speed of 540 km/h and a maximum takeoff weight
of 70.3 tons. It adopts the layout of the single upper rectangular straight
Fig. 7.38 American C-130 tactical transport aircraft (cruising speed 540 km/h) (upper
wing, straight wing, four-engine wing hanging arrangement, conventional layout)