Archived posting to the Leica Users Group, 2002/03/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Some airfoil profiles are symmetrical. All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho - -----Alkuperäinen viesti----- Lähettäjä: Douglas Herr <telyt@earthlink.net> Vastaanottaja: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us> Päivä: 06. maaliskuuta 2002 20:30 Aihe: RE: upside-down airplanes (was: [Leica] Optical Question) >Ernest Nitka wrote: > >> why is that airplanes can fly upside down - if >> flying upright caused a vacuum just above the wing >> creating lift then flying upside down should cause >> the wing to move down. This has bothered me for >> near on 2 decades. I get bothered easily >> >> ernie >> > >The airplane's wing is designed to produce lift efficiently at it's normal angle of attack but it can produce additional lift inefficiently by increasing the angle of attack (until it stalls). The upside-down airfoil relies on a high angle of attack to produce lift but does so very inefficiently. > >Doug Herr >Birdman of Sacramento >http://www.wildlightphoto.com > - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html