To: IHL
Having an incomprehensible mixing unit will have no effect on the test. The mixing unit allows the coupling of vectors in flight control movement while at the same time allowing for collective (up / down) movement. All things being equal when you perform the test with low collective you will only be utilizing the fore and aft (longitudinal) movement of the mixing unit. On some Sikorsky helicopters there is a built in left bias to counter the tail rotor (propeller) effect when the collective is raised. With low collective this does not come into effect
------------------
The Cat