Abid
It could just be a question of a difference in usage of a common vocabulary but I’m not very happy with your use of the word “tease”. For me it implies that something underhand is going on and that Chris is trying to seduce owners with a vibration analysis to be able to sell a full rotor track and balance. Chris has been very clear he/we don’t intend to do any balancing, if we find a rotor that needs it the work will go to whoever locally (perhaps you??) can do the work for them.
As Chris said the aim is simply to carry out the same first flight that you must do for every rotor you track and balance (RTB). This allows you/us to simply see if an RTB is necessary from the polar chart and if the 2/rev, prop and engine vibrations are typical or not from the frequency spectrum.
I would also say that if any owner who profits from Chris’s offer also attends the “Understanding rotor vibrations & basic dynamic balancing“ class they should be able to diagnose for themselves if any further work is needed without any influence from Chris or me.
Regarding stick shake I’m not sure what point you are making, if you are saying that stick shake and rotor vibrations are not necessarily related, I agree. You can have a perfectly tracked and balanced rotor with horrendous stick shake. This isn’t part of the “Understanding rotor vibrations & basic dynamic balancing” class but it’s always one of the questions that comes up in the question/answer session afterwards.
Mike G