Don't know much about this but maybe someone can help.
Picture the plane flying away from you and you watching from the tail end. You than push the right lever on your radio full up.The plane dives down and under and continues to come up and with a little throttle it pulls up levels off and flies straight. Well when it pulls from under and you give it that throttle it aways seems to come up tilted to the left. That means the left side tipped down. Why is the left side tipped down. I have trimmed until I blue in the face. Would it be a weight problem, balance? Suggestions needed! I am flying a Bug. Thanks Ron

darticus:

Its usually one elevator moving more than the other, can also be unballanced from side to side. Its tough to play with ballence when you stick on a battery after each flight. Each time you replace the battery, thangs can get all goofed up. Unfortunately, there are a lot of things that can cause your bird to snap in a tight loop and you just have to play with the problem until you cure it, including CG. Enjoy

or just torque from the prop

I dive my planes power off then give a hard pull up or pitch forward. Usually it will want to snap left or right one way or the other. I can trim using rudder trim to get rid of one or the other but not both. If I trim for reducing snaps when I pull up then the plane needs more right rudder in a hard climb. Trimming for an inverted pitch up, usually reduces the need for right rudder when climbing.
You should get close to neutral but I don't think you can eliminate all of it's tendencies to snap one way or the other.

it's probably just the torque from the prop. it can't be trimmed out you just have to correct with right aileron

Most planes will require you to fly the rudder in an inside loop.....how much rudder depends on the plane and the speed / tightness of the loop.

Pushing the stick forward is called an outside loop. Inside is with the stick back. Sometimes I have a habit of giving a bit of ail. when doing loops without realizing it. Another thing you can try is to trim it with ails till it loops straight, then the use rudder trim to get it to fly straightand level. As said above make sure you have tha same travel on both ails. In fact you could lessen the throw on one side to make it come out level. Could be such a thing as the EPP foam twisting on one side more than the other. Lots of food for thought.

Doh....you are correct of coarse.....I meant outside loop....brain fart

LOL

I'm disappointed - I thought somebody was working on flying a fixed-wing backwards, and looping it - you know, with one of those new variable-pitch propellors - ? Now, a *real* 'backwards loop' - that'd be cool to see! (Helis do that, already, of course - except for mine )

qwerty3, there is a video of a guy doing just that, but I don't remember where I saw it. I'll look and see if I can't find it. Trevor

Sorry I can't find the one I was looking for,but here is one very similar, and very cool! [link]http://www.youtube.com/watch?v=fhCOHF24kRc[/link]