Newsgroups: sci.aeronautics.airliners Path: news From: raveling@Unify.com (Paul Raveling) Subject: Re: hydraulic problems with DC-10's?? X-Submission-Date: Fri, 11 Dec 92 21:21:35 GMT References: Message-ID: Approved: kls@ohare.Chicago.COM Organization: Unify Corporation (Sacramento) Sender: kls@ohare.Chicago.COM X-Submission-Message-Id: Date: 11 Dec 92 17:42:34 PST Several people: lhe@sics.se (Lars-Henrik Eriksson) drinkard@bcstec.ca.boeing.com weiss@turing.SEAS.UCLA.EDU (Michael Weiss) write about the question of whether slats do or don't improve Cl (coefficient of lift), in addition to affecting stall speed (critical angle of attack)... I'd surmise that slats should increase Cl at any given AOA. The reason should be that they should delay boundary layer transitions (laminar-to-turbulent, turbulent-to-detached), increasing the wing area that's working efficiently. It's also true that this allows using a higher AOA, as noted by Lars-Henrik Eriksson; deployment of slats (and flaps too) DOES increase the AOA at which the wing achieves max Cl. An exaggerated example of this is adding a jib to a sailboat that formerly had only a mainsail. Adding even a small jib improves the main's Cl substantially. ------------------ Paul Raveling Raveling@Unify.com