June 5, 200323 yr I'm wandering with all the tweaking and workarounds to the FS2002 turboprop model, if they do fix it in FS2004, will it break all of these planes?
June 5, 200323 yr Knowing Steve, the engines are probably right. It is one beast of a machine.Record: Piper Cheyenne 400 twin-engine turboprop from Burbank, Calif., to Jacksonville in 5 hours, 6 minutes.Record: Fastest turboprop climb to FL400 - I have seen this before somewhere, will keep looking and post it.
June 5, 200323 yr "By turning the blades edge on into the relative wind, the rotation stops and the only drag that then exists would be from the "knife edge" of each propellor blade. I suppose it all depends on what the exact definition of "fair resistance" is." Well, this does get complicated. At relatively low speeds, say 100 mph, and prop feathered so that only it leading edge faces the direction of flight, the amount of resistance would be negligible. As speed increases to around 200 mph, the air flowing over an airfoil (a propeller is an airfoil) will cause measurable induced drag - how much depends on the shape and twist (if any), and front surface area of the prop blade. Many props do not actually reach 90 degrees to direction of flight when in feathered position (I do not know if this is the case with the Cheyenne).Yes, I realize that props are not feathered in fine pitch. I was trying to make a point that a stationary prop with its flat surface turned toward the direction of flight, would act just like a speed brake. You are correct that most variable props are designed so that this cannot happen.Dale
June 5, 200323 yr Author Many>props do not actually reach 90 degrees to direction of flight>when in feathered position (I do not know if this is the case>with the Cheyenne).>Technically speaking, I doubt you would find "any" modern day props that could go full 90 degrees against the direction of flight. This is because the "root" (near center-- for anyone not familier) has a higher pitch angle than the tips. They just get progressivly lower in pitch all the way to the tip. This is because the revolving tip speed is much greater than the smaller diameter at the root where it connects to the hub. By varying the built in pitch, the airflow across the blade is more constant.Now before I say anymore............ how is it on those big turboprop wide aspect ratio fan blades? I havn't checked lately! :)Ladamson
Create an account or sign in to comment