I like military aircraft, and recently I've been researching the feel system for the control stick.
It seems that there is something called bob weights to improve the feel of an aircraft. It's a logical system to provide resistance to the stick according to vertical acceleration.
My question is that some hydraulically controlled aircraft have two bob weights.
Why do I need two bob weights? Looking at the diagram, it appears that the rear bob weight pulls the stick toward you. In other words, does it mean that the mass balance is achieved by the front bob weight and the aft bob weight?