Hello to all and thank you for your contributions.

I have a question regarding elevator trim on my Global RCM 40 (high wing trainer with flat bottom airfoil), fitted with an OS 46 FX.

The plane generally flies well and has been a good learning tool. However, I notice that the elevator trim appears to be throttle dependent. For example, suppose that I trim the plane for level flight at 2/3 throttle. If I increase to full throttle, the plane gains altitude. If I decrease to half or 1/3 throttle, the plane loses altitude. So,

Q1. Is this behavior normal for this type of plane? If so, why? Is it because the amount of lift generated by the wing is changing with the change in air speed? Does this happen with planes with semi or fully semetrical airfoils? Would a 4*60 do this (I am considering this for my second plane)?

Q2. If the answer to Q1 is yes, then do others who have a similar situation with their plane reset the elevator trim when they change throttle settings, at least when they are going to fly with a particular throttle level for a long time?

Q3. Do others re-trim for landing? Right now I compensate with up elevator as I am approaching for landing at low throttle.

Regards,

Travis