wingtip vortex造句

• Others say it involves something called wingtip vortex.
• Wingtip vortexes resemble two rotating whirlpools of air that can trail several miles behind an aircraft.
• The winglet converts some of the otherwise-wasted energy in the wingtip vortex to an apparent thrust.
• This inboard lift is not restricted by wingtip stall and the lift-induced wingtip vortex generation is thus reduced.
• One theory on migrating bird flight states that many larger bird species fly in a V formation so that all but the leader bird can take advantage of the upwash part of the wingtip vortex of the bird ahead.
• If viewed from the tail of the airplane, looking forward in the direction of flight, there is one wingtip vortex trailing from the left-hand wing and circulating clockwise, and another one trailing from the right-hand wing and circulating anti-clockwise.
• A long-standing challenge for the designers of competition sailplanes were the conflicting requirements posed by the need to gain in height in sometimes weak and narrow thermals, calling for high lift and low aspect ratio and raise the induced drag caused by wingtip vortexes.
• Following the end of World War II, Dr . Sighard F . Hoerner was a pioneer researcher in the field, having written a technical paper published in 1952 that called for drooped wingtips whose pointed rear tips focused the resulting wingtip vortex away from the upper wing surface.