To: Gaseous
Has anyone considered the human physiology aspect of this, and as such did FR come to the 18 degrees offset based on what felt "right" rather than any other design criteria. It cannot be contested that the offset is not a problem to pilots under normal circumstances.
To my understanding Frank Robinson designed his rotorhead and then designed the helicopter around it. The 18-degree offset is the result of incorporating cone hinges on the rotorhead. With the design of the rotorhead being the driving force Frank had to settle on a 72-degree pitch horn as he could not even consider a 90-degree pitch horn as he had stated in his posted response.
However the control system is very much like a Bell in that the swashplate tilts down over the nose with input of forward cyclic. This resulted in the Robinson rigging procedure that places the pitch horn over the forward edge of the swashplate and in order to accomplish this the blade must be 18-degrees forward of the lateral centerline.
If the blade in fact has a 72-degree phase angle with no phase angle shift then I am totally wrong. However if it is like the Lynx then I am right.
