Tail rotor turning direction
Hi everyone.
In the most of the types, the tail rotor turns in such a way that the blades closer to the main rotor downwash go upwards, slashing into it. This is true for the most of the helos and makes sense to me specially in forward flight as of 20-30 kt where the tail rotor disc should get more effective as it is washed by the main rotor. Just like with ETL, where the main rotor becomes more efficient as the advancing blades slash into the air.
I was wondering why in a few types the tail rotor turns in such a way that the blades closer to the induced flow go downwards (thus escaping from it) like in Robinsons, S300, MD500, OH-23 and a very few more.
Thank you!