For all those who do NOT believe in the Bernoulli theory, I would suggest you try this simple experiment: take an ordinary teaspoon and dangle it from the handle so that the curved surface just comes in contact with a stream of running water and watch what happens. Yes water is much more dense than air but the principle is the same with a airfoil. The difference is that the median that it is traveling through, air versus water, is much thinner and therefor has to be moving faster to achieve the equivalent force.
Yes there is some lift created due to the angle of incidence and the resulting downward deflection (this is one of the causes of what is called “ ROUND EFFECT”) of air produced due to the forward movement of said airfoil through that median BUT the vast majority of the lift created is due to the differential in air pressure that is created due to Bernoulli’s theory. Aircraft produce lift and thus fly due to displacing their weight in air just like a ship floats by displacing it’s weight in water. A two thousand pound boat has to displace 2000 pounds of water in order to stay on top of the water and an aircraft has to displace the equivalent amount of air as it’s weight in order to maintain or achieve bouncy in the air. As a boat moves through water it produces a wake which is nothing more than the water that was displaced by said boat returning to its natural state of equilibrium once the boat has passed. An aircraft also produces a wake and it is evident by the wingtip vortices created at the wing tips as the air pressure flows from the high pressure side of the wing, the bottom, around the tip to the low pressure side of the wing, the top. This explanation also explains why we feel a bump every time we fly through a cloud, the cloud is LESS dense than the air around it and thus can NOT support the same amount of weight given the same numbers of speed, weight, angle of attack and drag that the aircraft was using and in equilibrium prior to entering said cloud. As far as thinking that flight simulators are not valid or are useless in training pilots, I beg to differ with that idea all together. I personally have well over 4000 hours in flight simulators of various makes and models, mostly the F4 but also B-27, DC-9, DC-8, L-1011, B-757, T-38, and T-37 types. I know of many times that pilots were able to save both themselves and their aircraft due to the things they learned while practicing in simulators. Most pilots that have the opportunity to fly these magnificent "Pretend aircraft", take the opportunity to try things that they would NOT dare try in the REAL aircraft and by doing so, learn what most likely will happen in that particular circumstance. This is only my $.02 worth on this subject, but I do have a commercial license and have been flying since 1974. I have flown many different types of REAL aircraft as well as the full motion simulators that I mentioned, have built and flown my own KR-2 and helped others build a Fokker DR1 triplane, a Vari-Eze, a Vans RV 6, and a Rans S-7. My comments are NOT meant to belittle, criticize, or in any way show how smart I am or how dumb anyone else is. Otherwise my comments are NOT meant to OFFEND anyone, I enjoy reading all comments and ideas about flying from the vast number of fellow pilots out there, they are very educational and I have learned much from them, THANK YOU all for your contributions to this forum. I hope this comment gives my fellow KR pilots some more information that will help or at least spark further thought on how our heavier than air creations actually take off, maintain and then come back down, SAFELY. Parley Byington A Vietnam era veteran N54PB Kr-2 byington1...@embarqmail.com <mailto:byington1...@embarqmail.com> Henderson Nevada > On Apr 23, 2019, at 05:46, Flesner via KRnet <krnet@list.krnet.org> wrote: > > On 4/22/2019 8:34 PM, Mike Stirewalt via KRnet wrote: >> I'm not questioning anything regarding your airmanship Larry so don't get >> annoyed. > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > No offense taken but I think we've taken this discussion as far as we can on > the net. We need to defer it to the Gathering campfire where we have "truth > serum" available to bring out the real scientific facts. > > Larry Flesner > > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
