Newsgroups: sci.aeronautics.airliners Path: news From: lhe@sics.se (Lars-Henrik Eriksson) Subject: Re: hydraulic problems with DC-10's?? X-Submission-Date: Mon, 07 Dec 92 09:04:21 References: Message-ID: Approved: kls@ohare.Chicago.COM X-Submission-Message-Id: <9212070801.AA08453@sics.se> Sender: kls@ohare.Chicago.COM Date: 08 Dec 92 15:50:56 PST In article drinkard@bcstec.ca.boeing.com (Terrell D. Drinkard) writes: In article weiss@turing.SEAS.UCLA.EDU (Michael Weiss) writes: >Which doesn't disprove my theory. As it is, though, the loss of the slats >(which, according to all my aero classes, only lowers the stall speed but does >NOT increase the coefficient of lift!) You may wish to recheck your math. It isn't possible to lower the stall speed without improving the coefficient of lift (assuming constant weight, air density, and wing area). >From what I've learned, slats don't increase the coefficient of lift *for a given angle of attack*, but they do increase the critical angle of attack. That is, using slats you can get a higher coefficient of lift by having a higher angle of attack than normally possible. (So you are both right :-) Of course, this means that when the slats retract, either nothing happens to the lift at all (if the angle of attack is below the no-slats critical angle of attack), or the wing stalls instantly. ---- Lars-Henrik Eriksson Internet: lhe@sics.se Swedish Institute of Computer Science Phone (intn'l): +46 8 752 15 09 Box 1263 Telefon (nat'l): 08 - 752 15 09 S-164 28 KISTA, SWEDEN Fax: +46 8 751 72 30