Why does my 4*60 roll to one side on the back side of a loop? It's not a big problem just wondering about it. I'm thinking one of the ailerons needs adjustment, but can someone please point me in a direction.

which way?

to the left?

Mine did..I added a bit of right thrust

There may not be one simple solution. The Engine thrust angle may be off. If the nose ends up more to the left after the loop, you may need more right thrust. One elevator half may need to be adjusted. Again, if it rolls to the left, raise the right elevator half a little bit. Another easy fix could be to check the lateral balance. ie..one wing may be heavier than the other.

If it were MY plane, I would make sure there is approx 2 degrees right thrust built in, and if so, lateral balance the airplane. If that is fine, adjust one elevator half.

If your flying field allows, fly directly away from you and pull a loop. You could see if your problem is YAW or ROLL induced

The elevators may not be moving equally. Even though they are connected by a rod they may not be equal.Especially if when they were glued together they were not weighted down on a flat surface. The epoxy during the drying process can introduce a warp.

Easy to find out. Take a long straight piece of balsa and tape it to the top of one elevator, take another straight stick of balsa and tape it to the other elevator. Both sticks should be pointing towards the rudder to the point where the meet right behind the rudder.

The sticks should line up and stay lined up all the way through the range of travel

As others have said rolling left could very well be you need right thrust.

I have even seen a misaligned rudder cause this

If I remember correctly it's pulling to the plane's left. I already have some right thrust dialed in with a couple of washers on the left side of the motor mount. Should I add another couple of washers?

I'll do the tests you all suggested.

If you already added right thrust and you vertical climbs are straight up then I would check out the elevators to make sure. A 1/8 inch difference will cause this. I had this with my 4*40 and ended up cutting off the elevators and teisting thhem (carefully) to get them to lie flat. Once reinstalled it would track well in loops and mine did roll left but verticals were straight up.

When I built my sixty I laid a peice of wood on the elevators and covered them with a nice thick phone book and it worked out great.

As I mentioned it could be thrust...Ailerons could also cause this. A heavy wing can also cause this. but the most common is elevator misalignment

You could also download a trim chart to help you and you will learn allot just by trimming the plane. Be prepared for a lot of work but in the end you will have a great flying plane. And before anyone askes, Yes I do it to my sport planes also. It's great practice.

http://www.rcaerobats.net/trim_chart.htm

I'd also check my incidences(sp?).

I used to have the same problem and I balanced my plane laterally (wings) and that did help.

If the pushrods from the aileron servos come straight back from the servo horn when the aileron is centered, then the ailerons will move more in one direction than the other. The pushrods should angle slightly towards the center of the servo when the aileron and servo arm is centered.

This will give an equal amount of throw as the aileron moves both up and downward.

Ernie

My vote goes with Bubbagates theory................[8D]