Canted Tails
Delta 3 has the math right, and also has the other thought that made the concept so attractive to "some" at SA in the early 70's, i.e., "something for nothing".
Prior to the UH-60 design, it was tested on two other models: the S-61R ( USAF model ) and the CH-53A. Of course we had added various mechanical coupling actuators which had electrically variable gains to arrive at an optimum "compromise".
But one doesn't usually get something for nothing and this has been the case with canted tail rotors as to getting all of the coupling and tail rotor height right. I believe that the Comanche did the best at making it transparent, fully utilizing the flexibility afforded by the fly-by-wire control system. The S-92 is in the process of doing the same thing.
Nonetheless it does provide a bit of opportunity for the double-headed dump truck drivers to have a shot!
I do very specifically recall a memorable AHS meeting in Connecticut wherein Sergei Sikosky had invited Marat Tishenko, the famous Chief Engineer from Mill Helicopters and a man who was personally involved in their most successful designs, to give a presentation to a group which was mainly SA people. After the presentation Sergei introduced me and I asked Dr. Tishenko whether Mil had ever looked into the idea of canted tail rotors? The good Doctor grinned and said with a twinkle in his eye, " But we always wondered why you did this!"
Thanks,
John Dixson