Hello..... I was watching a video of Bob.... he talks about correcting CCPM interactions.... what is that?????

Lets say you give full collective for a climb out.

3 servos work to push the swash all the way up.

But as you're climbing out it goes up and starts to roll to the right so you are getting roll with your collective input. That is swashplate interaction.

Ok, I see.... yesterday I set up my t-rex but I missed checking 'ccpm interaction' because I didn't understand what it was..... next thing, I went to fly the helicopter and as soon as I was trying to lift it, it started to go left and backwards against the wind direction.... do you think that had anything to do with it?????? It was not stable at all.... I had to push to the opposite sides to keep it balaced but it was a bit windy and I could't keep it straight and I tried to land it and it was going too much to the left that it turned on the ground.... could that have been caused by the 'ccpm interaction'??????

What type of trans are you using?..What are the settings set for ccpm? explain your hardware

DX7, AR6100..... 120deg SWASH..... AILE 50%, ELEV 50%, PIT 30%... is that what you mean?????? EXP Inhibited....

Yes, that sounds correct so when you have your motor unpluged and you move your stick in a circular motion, does the swash look to move in the correct manner as your thumb input to the sticks

yes, it does....... what I described before it's that instead just staying 'balanced in the air' because I was just pushing the throttle (not the aileron or pitch).... the helicopter started to drift left and backwards... as if the swashplate were not straight... but I wasn't moving anything else... or as if the wind were blowing that way, but it wasn't it was blowing the opposite way!!!!.... I don't have explanatino yet, I know the lama v3 is different but when it was happening it was because the swashplate was straight and I corrected that just applying some subtrim in the air until it doesn't move and stays balanced..... do I have to do the same here??????

It's normal for the heli to want to push left due to the side thrust provided by the tail rotor as a side effect of counteracting the main rotor torque. When you're in a stationary hover, you'll probably notice that the heli is leaning slightly down to the right, which is perfectly normal.

The backward drift could be a CG (center of gravity) problem. If you balance the blade grips on your fingers with the nose of the heli facing toward you or away from you, are the skids parallel to the ground?

i have found that most interactions occur near the limits of servo/linkage travel. If your problem is right when taking off, its probably what bum said, simply the normal drift caused by the tail rotor at low altitudes. If you get your heli in a stable hover at about eye level and dont touch the cyclic and simply watch where it goes, trim opposite and at least your hover should be somewhat stable. Interactions are a bit trickier because fixing one thing usually causes something else to screw up, basically you most likely wont be using the extreme limits of travel anyways so get it to fly solid through 90% of the travel and by the time youre ready to tackle that last 10% it wont really be much of a problem anyways.