Regarding trim problems, I notice a lot of you are talking about joystick settings, etc.  However, there is another thing to consider.

When I get a new airplane, I am usually annoyed by either elevator or elevator trim response.  I experiment with improving it by varying the [Flight Tuning] section of the Aircraft.cfg file. Initially, you always find the parameters "elevator Effectiveness=1.0" and Elevator Trim Effectiveness=1.0".  These are defaults for the Airfile model.

I play around with these (saving the original settings by REMing them out, i.e. "// original was 1.0", etc)

I then vary the one I do not like, up or down, in 0.1 increments until I get what I want.  I have had great success this way.

Also, the null zone of the joystick sensitivity setting (Options Menu) is a factor that may affect you - there has to be SOME free play, but not TOO much!  This allows you to rest your hand on the stick without inadvertently changing the airplane attitude.

Regards
Mike
Buffalo, NY
CAPT USN Retired

I agree with a lot of what is said about trim, but technically, elevator trim ultimately sets a stabilized INDICATED airspeed, not a pitch altitude.  This is true until you approach transonic speed - True Airspeed or altitude does not matter - it is indicated airspeed that elevator trim responds too.

Unfortunately, trim is also a matter of power setting and configuration (flaps and gear) - trim stabilizes IAS for a given power and configuration. Change power or configuration, you will have to re-trim to hold the same IAS.  Each type of airplane disturbs trim differently, but typically, adding power or raising flaps causes the airplane to seek a lower airspeed (nose up pitch impression), and power reduction or flap deflection tends to make a plane seek a higher airspeed (nose down pitch impression).

In the end, TRIM, TRIM, TRIM! You want to smoothly GUIDE an airplane so you can do other things, not just muscle it around.

Another thing: I think most would agree that the distribution of trimming effort would go like this:

Most often used – elevator
Mid – use (props) – rudder
Least use - ailerons


Regards
Mike
Buffalo, NY USA