Ball
Very good question, Shawn. When the Army decided to do the MH -60K/MH-47 and IBM Federal Systems, Owego put the avionics system together, one of the basic problems it surfaced had to do with how they synthesized the mechanical ball. They used a filtered lateral acceleration signal, if I recall, and had a tough time with adjusting the signal processing to make it smooth enough to use.
I do not remember if the system stuck with the electronic derivation, or whether they simply added a mechanical ball at the bottom of the MFD.
Last edited by JohnDixson; 2nd Aug 2013 at 12:20.
Reason: Additional thought