Well, thanks for all that guys! I am still not sure why pendular Action is considered that important, I am sure nothing remotely like that was included in my CPL syllabus.
As far as Chinook control inputs are concerned I was lucky enough to fly it with very few hours at the time (under 300) and found it flew just like any other helo control wise, tho there were some differences in technique, take off & landing were a wee bit different - a bit like sloping ground technique because of the nose up attitude in the hover. Two wheel taxiing was fun, and autos were flare flare flare with no check at all, and a long long nose up ground run. Glorious toy!