I have been thinking about the black shark.

In a single rotor aircraft,
One can easily achieve a fast sustained sideways movement by counteracting the torque of the main rotor with the use of the tail rotor.

Using the same method. A single bladed helo can rotate on its axis both clockwise or anti clockwise by either overcoming or submissing to the torque of the main rotor.

So how does a duel rotor helo achieve the same actions as the toque is mostly countered by counter rotating blades.

Is there a kind of differential to slow or reduce the torque of one rotor over the other to achieve the desired torque related rotation.

I understand that at speed that tail fin will act similar to a plane. But in a hover ????

Intrigued i am.

My guess is one rotor increases blade AOA while the other lowers it. This keeps lift constant while inducing a moment. I don't know for certain how it works on tandem rotors like the CH-46 and CH-47, but there it's probably one rotor tilts left and the other tilts right.


The Jedi Master

This may help.

Oh and Jedi Master.... :p I still want a AH1W or Z (I have my reasons )

You're right about that for coaxials. One will increase collective, the other decrease. This causes one disk to create more torque, the other less, and the chopper yaws.

For inline (CH-47) or side by side (Ka-22, Mi-12, MV-22 when pretending to be a helo) tandems simply cyclic the rotors opposite to each other. In a Chinook, if it wanted to yaw left, the forward rotor would get a 'roll' input to the left, and the aft rotor a 'roll' input to the right.

Ahhh i didn't think of that.

Thanks.

Wow, so both my guesses are right! My helo knowledge is far less than my fixed wing knowledge, so I was just making guesses based on what I knew of rotor dynamics. I'm shocked!


The Jedi Master