Date: 19 Feb 98 01:33:51 From: email@example.com (Stephen H. Westin) Organization: Program of Computer Graphics -- Cornell University References: 1
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RLION@worldonline.nl (Lion's Pers Agentschap) writes: > What is the reason that airliners have engines under the wing instead > of on it? > > Possibly it will take a little bit more aluminium to construct > airliners this way, but with overwing engines the wing can deflect a > big portion of the noise for people living around airports. (This can > be reached even without improving the engines themselves!) Please cite the tests that have shown this. <snip> > (If you want to see how a Boeing 747-400EOW (engine on wing) looks > like, visit: > http://home.worldonline.nl/~rlion/lapr011e.htm Well, I think the airflow over the wings might be a bit problematic with the configuration shown. Not to mention the problems of blasting the aluminum skin with hot exhaust, a situation that required modifications to early DeHaviland Comets. I think the traditional underwing mounting was chosen to minimize airflow interference with the wing. Notice that the VFW-614 mounted its engines well above the wing. See <http://www.bs.dlr.de/wt/fb/bs/ATTAS.HTM> for a photo of one still in service as a testbed for DLR. This one has been modified with a fly-by-wire system to simulate the handling characteristics of various aircraft. Low mounted engines will also tend to increase the angle of attack by twisting the wing, which is probably not a bad thing at takeoff time. Didn't the VFW-614 require special stiffening to counteract unfavorable wing twist? Finally, engine inspection and maintenance would be more complicated with over-wing engines. <snip> > Lion Air - The Royal Dutch Alternative "Lion Air is a virtual airline. We cannot accept your bookings!" I think we have progressed beyond vaporware to vapor airlines... -- -Stephen H. Westin Any information or opinions in this message are mine: they do not represent the position of Cornell University or any of its sponsors.