To: rotorpol
I have to make a few assumptions regarding your question. You are talking about a Bell helicopter that has a transmission that is able to move relative to the fuselage. The major connection between the transmission and the fuselage is a “Lift Link”. From here on it takes a great deal of visualization. The lift link is not connected to the transmission in a direct line with the rotor mast. In fact it is attached at a point left and forward of the transmission center line.
When you pull collective the transmission will raise and because it is not attached at its’ center point the mast will lean forward and to the left. This is now its’ neutral point. Any cyclic input will cause the transmission to lean in the direction of the cyclic input. Because the pivot point is not on the centerline of the transmission the movement will be exacerbated giving the pilot the impression that the pylon is rocking which it is. If the lift link were attached at the centerline the transmission would still lean but the resultant feeling by the pilot would be much less.
I will now retire to my bunker as there will be twenty or more replies stating that I am wrong.
