Chinook-style craft will generate interesting and unpredictable effects due to axis coupling effects. If you want to build a really stable Chinook style craft, consider looking into how those are actually built - they adjust their whole rotor assembly plane of rotation, rather than just using cyclic/collective.
I'm pretty sure that the CH-47 Chinook and other tandem rotor helicopters use regular swashplates and don't actually "bend" the central axis of the rotors. In the descriptions I found they show that the CH-47 does have swashplates fore and aft, but I haven't seen any mention of a coupling that allows it to tilt the central axis. Also the cyclic control has essentially the same effect as physically moving the plane of rotation of the rotor: the direction of thrust the the rotor generates changes.
I believe that in the cited document (and others) the control is shown as tilting the rotor because that is easier to display and understand and not because the rotor really physically changes.
1.9 Advanced Blade Controls
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I'm pretty sure that the CH-47 Chinook and other tandem rotor helicopters use regular swashplates and don't actually "bend" the central axis of the rotors. In the descriptions I found they show that the CH-47 does have swashplates fore and aft, but I haven't seen any mention of a coupling that allows it to tilt the central axis. Also the cyclic control has essentially the same effect as physically moving the plane of rotation of the rotor: the direction of thrust the the rotor generates changes.
I believe that in the cited document (and others) the control is shown as tilting the rotor because that is easier to display and understand and not because the rotor really physically changes.