Barbers pole question!
Morning!
Question guys, see if you can help, I was having a yarn with my crew yesterday..
In a turbo prop a/c what is the limiting factor with the barbers pole? For example in mine it its 250knots (Vne) reducing to .48 mach when climbing (colder temps).
What is the story with .48? is that the speed where the tips of the props start to become inefficient due to the local speed of sound or some other structural limitation?
Thanks in advance