From: Joacim P. <no...@tu...> - 2006-06-28 09:06:28
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On Tue, 27 Jun 2006, Josh Babcock wrote: > But you don't *want* the rotor to be straight. Assuming a constant > airfoil section along the length of the blade, you would want a constant > aoa so that you can get the maximum lift out of the blade. I'm glad you didn't read what I had typed, because I was full of shit. =) (I said the tips have *higher* incidence) Late last night I was looking at a picture of a parked chinook and saw, erroneously, that the blade tips had higher incidence than the root, not lower. In the process of trying to grasp this mind-bogging concept with my little mind I assumed the blade must flex back, or most of it would be stalled during flight. After a good night sleep and investigating the matter more thoroughly it is now my great privilige and honour to report that the chinook and the bumble-bee are both well and flying. The blades are twisted the right way, i.e angle of incidence are lower at the tips than at the root. (and the aft rotor rotates clockwise) |