BobbY: Boundry layers and reynolds number have to do with any fluid flow. I had to design asystem to convey soluable oil coolent in a central chip conveyor system out of a machine shop and in area it was importent to keep the velocity just right to assure the entrained solids were carried in a gravity flow fluid fluid stream, too fast and the fluid left the solids behind and tooslow the solids dropped out. My figuring that out got into boundry layers, laminar flow and reynolds numbers! Same thing holds true for dust collection systems and the design of racing boat hulls not just airplanes. My experience was a one time thing 30 years ago.---- FOGOT MOST OF IT
Don ------------------------------------------------------------------------ bo...@hatconversions.com wrote: > Jim, > What is your occupation? Lots of people don't understand boundry > layers and Reynolds numbers. Bobby > > > .This is absolutely nuts, comparing the flight of a golf ball to an > > airplane is like comparing the weight of a bowling ball to a ballon. The > > airplane with a laminar flow airfoil on the wing is the lowest drag you > > can get and is the fastests, but to get laminar flow the surface must be > > very smooth and free of waves even fly specks will trip the flow at high > > Reynolds numbers above 15 million and bugs also will. the Reynolds > > numbers on the KR-2 and most general aviation aircraft is in the range > > from 2 million to about 4 million which is the real key to this anology > > of the golf ball and the KR-2 the Reynolds number for the golf ball is > > about 100 and the reason the drag is lower for the golf ball with the > > dents in it is the flow becoms turbulent and reduces the seperation drag > > because below a Reynolds number of 400,000 the drag of a laminar flow > > airfoil is higher than turbulent flow and so it is with the golf ball, > > the Reynolds number is much less than 400,000. ITS THE REYNOLDS NUMBER. > > > > Really > > Jim > > > > _______________________________________ > > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > > please see other KRnet info at http://www.krnet.org/info.html > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
