Date: 28 Sep 97 20:59:08 From: firstname.lastname@example.org (Mark Drela) Organization: Massachvsetts Institvte of Technology References: 1 2 3 4 5 Followups: 1
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In article <airliners.1997.2285@ohare.Chicago.COM>, Marc Schaeffer <email@example.com> writes: > Steve Lacker wrote: > > Marc Schaeffer wrote: > > > How can a fuselage contribute to the lift ???? > > > > The same way a wing does! higher air velocity on the upper surface > > results in a lower pressure on the top surface than on the lower one. > > Thats exactly how "lifting body" aircraft (thus far mainly experimental) > > operate. > > Does *any* of todays commercial a/c have such a fuselage ?? > If yes, what amount of total lift (%) does it provide ?? > > > Now, I don't know whether or not the 747 hump truly produces lift... but > > a lifting fuselage is possible. > > Take a banana as fuselage and you got it :-) Not necessary. A straight fuselage will naturally carry some lift since the pressure difference above/below the wing gets partially carried over onto the fuselage. The wing's pressure field cannot stop dead at the wing root! The lift carried by the fuselage is considerable. For a mid wing it is comparable to the lift you would have on a carry-through section of the wing. For this reason, the reference wing area defined for a jetliner often includes this imaginary "interior" wing area. Mark Drela First Law of Aviation: MIT Aero & Astro "Takeoff is optional, landing is compulsory"