Chinese Patent for Helicopter without tail rotor

[hesham]

Hi,

https://www.researchgate.net/figure/Fig-21-US4928907-to-Compound-helicopter-with-no-tail-rotor_fig20_228340073

 

[Nik]

After a couple of Cloudflare 504 errors, the linked images appeared...

I cannot make sense of the tail's 'pusher' prop effectively offsetting the main rotor's torque.
As far as I can see, the thrust line is off-set, and it has variable pitch...

Is this a fair call ??

 

[yasotay]

If you make the pusher prop turn 90 degrees. Mechanical drive nightmare! But, if you have an electrically driven prop ...

Sikorsky did a mechanical turing tail rotor in the 1970's I think. Karem Aerospace proposed an electric tail rotor it for their FARA submission.