I know that there are alot of people that have tried putting a larger engine on a plane than what is recomended. I was wondering, since I'm trying to do just that, how they compensate for their C/G since a larger engine really makes mine nose heavy. Please inform me of any tips that you may have. (if I use weights, it will take alot.)

...Hangar 9 cherokee-calls for up to a .56 4-stroke and I'm trying to use a .61 2 stroke.

you can buy half ounce lead weights that already have the adhesive installed at your local hobby shop. stick one of those in the tail or stick a fishing weight in there. i dont know how much weight you will need, but probably less than an ounce and you will have the power to compensate, hands down.

First try moving the battery pack and any other equipment as far aft as possible. If that doesn't get it, you will have to add weight to the tail. Try using those stick-on weights on the bottom of the stab. Run some CA around them to make sure they stay stuck.

It sounds like a pretty good idea. Don't know why I wouldn't have thought of it though. But the stick on weights are new to me. I've always used stock lead or something else.
thanks for the tips.

You just have to be careful. If you end up having to add too much weight, then it's no good, because wing loading will be too high. I had an easy 2 trainer that I installed the recommended engine on. It was soo nose heavy, that we had to add close to, or maybe a little over a pound of weight to the tail. I think this plane wasn't designed very well at all. Anyway, needless to say this thing landed hot. Luckily It was not my first plane, so I was able to handle it. One day, though, when I was doing some acrobatics with it, I went to pull it out of a dive, and the wings simply folded up. They couldn't take the strain. Be careful about how much weight you have to add. If it's not more than a few ounces, then you should be fine!
The fishing weight idea is awesome. I've never thought of that.

I'm gonna go against the grain here and ask why you are trying to put a .61 in a .40 size plane of this type? The torque and extra weight of using a .61 is likely to hurt the overall performance of that plane. Even if you shift the battery you will still likely have to add tail weight and the plane is probably gonna weigh 1/2 pound more than it would with a good ball bearing .46.

I have added bigger engines, and I have Learned to CA a long strip of velcrow (the adheisve on it doesn't stick to balsa well) as far back as you can get it, and but some on you battery, and get it as far back as you can, I have a plane where the battery is a good 6 inches behind the servo tray