See also a reply I just wrote to a team having trouble getting the plant to climb. Extensive discussion on how to control turn.
<SNIP>The plane design is generally asymmetric to overcome the left turn induced by the propeller, <SNIP>
I need to correct that thinking.
There are two asymmetric features to overcome the left bank induced by the propeller rotation. The longer left wing and the left wing wash in. The goal is to fly a left turn with relatively level wings.
All other asymmetric features are designed to cause a consistent left turn over the range of speeds the plane flies.
- Left prop thrust induces left turn at high thrust, influence dropping as the rubber winds down.
- Tail boom bent to left acts as a rudder to control turn radius in the middle of the flight.
- Horizontal stab tilted to right (left side high) causes left turn and controls the radius as the speed slows.
If you don't have enough turn at the beginning of the flight (flies straight initially and then starts turning), you need more left thrust or more bent tail boom.
If your turn opens out wider through the flight, you need more stab tilt (raise left side higher).
If your turn is steady but too large, you'll need BOTH more bent tail boom (easier than thrust angle adjustment) AND more tail tilt.
If your turn is steady but too small, you'll need to reduce both tail boom offset AND tail tilt.
If you broke enough things, look at the plane when it is fixed, and make sure all the tweaks are still there as intended. Then treat the plane as if you are trimming a new one from the start.