Now when you fly the model....

Fly it directly away from you into any wind. Or directly downwind. Do this many times at 1/2 throttle, So you are flying without crosswind and looking at the model straight on. Set you rudder trim. It may take several passed. Also you will likely have to play with aileron trim trim too.

But make the model fly straight no flat turning...and the ailerons are dead on hands off as well.

Once you have this set...vary the throttle like 3/4 power, or even full power and the same test.

Then fly directly away from you go to a given power setting that will maintain a straight no flat turn situation in level flight and pull to vertical, leaving the throttle where it is even if its 1/2. After the corner straighten the model if it needs it then let go and watch the model. Since its going directly away from you don't be out 1000yds but don't be right over you head either. Do the test many times and make sure you are pulling straight into the vertical....let go and watch the model. This will tend to show you if you need more thrust offset left and right or not.

This same test happens at higher throttle settings...But for now don't vary the throttle in the vertical...set it where you need it and then pull the corner leaving it alone for the up line.


Once you have your thrust line tweaked goo like this then we can talk about variable throttle changes on the upline....This is where we will use a mix if its needed....If the model pulls the corners and goes straight without the throttle moving its set for thrust line. However it is possible that throttle position changes down then up then down on the up line will cause the model veer a little this is usually minor. See what you got and we'll talk more.


Do the tests many many times to determine if the model is doing the same thing. If its very slight to the left or right...try a click or two of rudder trim and then re-do the straight flight away and toward you to see how it affects the horizontal lines and the flat turning. You will get a rudder trim that is about right but it still may wander just a little on a upline...or its goo all the way until full power and at 3/4 to full at the very tops it will wonder just a smidgen. When you get it like that come back and let me know....and we'll discuss the next step.

This is the proper place to apply the throttle to rudder mix. But there are some pitfalls and you want to avoid them. By the way my Focus Sport doesn't have the throttle to rudder mix I just checked the radio.


Troy Newman