piolenc
Joined 6/2007
- Joined
- Jun 27, 2007
- Messages
- 116
- Location
- Iligan City, Philippines
- Aircraft
- none
- Total Flight Time
- 13 (student)
This is about an alternative to flapping as a means of cyclically varying the incidence of the rotor blades. In this scheme, the two opposing blades are rigidly linked to each other, but are held to the hub by a bearing that allows them to feather - that is, to change their incidence. A decrease in incidence of one blade produces a corresponding increase for the opposite blade. The position of the feathering axis with respect to the blade chord lines is chosen so that the blades oppose each other, each one trying to reduce its own angle of attack to the local stream, forcing the opposite one to a higher angle. Naturally the advancing blade, seeing higher dynamic pressure, is able to feather itself to a degree, forcing its retreating mate to a higher angle, thus balancing the aerodynamic forces on the two blades.
Years ago I thought I had "invented" this, only to find instances where others had used it. Now I'm searching for it again, but I can't find it, which means that I'm using incorrect search terms. Can somebody help me with the correct teminology?
Years ago I thought I had "invented" this, only to find instances where others had used it. Now I'm searching for it again, but I can't find it, which means that I'm using incorrect search terms. Can somebody help me with the correct teminology?