Well i have done the loops and rolls (rolls left and right) and found it was starting to et a bit boring thus my flight were vut down to about 6 minuts (didnt know what to do so your just flying around burning fuel) SOOOO (mistake #1) i though i would try an outside loop. well i almost got to the apex of the loop when it did this wierd fliping roll thing that really disorentated me. Tried it a couple more times but the same thing kept happening.

What am i doing wrong?

Not sure what type of plane you are flying but if it is a trainer type high wing plane then I suppose that your plane probably just doesn't have enough power to pull through the loop and was stalling at the top. Try it with a bit of an inverted dive first and see if that helps. IF not, wait untill you move up to your next plane and try again.

Yea its an alpha 40 with an evo 40 motor. And i really cant make it to the top im on full down on high rates (its hopless on low)

Sounds like you don't have enough air speed.
Try to start out high up and up right and then do an outside loop.
So instead of the loop connecting at the bottom do it so it connects at the top. You should have enough speed that if it is not going fast enough at the bottom you can roll out.

I've been working with a student on a Hangar 9 Alpha 40 and found it can't maintain the momentum, combined with the aerodynamic drag, to make through an outside loop – its just beyond the capabilities of the plane. If you’re to that point in flying, I’d suggest getting another plane that is more aerobatic to allow you to expand your skills.

Hogflyer

I have incress the momentuim (throw an 10x6 apc pro on there and you will be blown away) but it still wont get it right now im getting inverted and i dive about 200 feet pefore entering the manuver (all at full trotal) and find myslef out of contorl at the top from a lack of power. maybe i could but another prop on there to inporve it a little more. any suggestions?

I honestly don't think there is much more you're going to do to improve it. You're just pushing the plane beyond it's capabilities. The plane is stalling and dropping out of the loop, thats why it's all over the place. A plane can stall at any airspeed, any attitude as long as the critical angle of attack is exceeded. That's what is happening here.

You said the roll is easy....

Try doing a slow roll... and keep flying in a straight line the whole time... No altitude gain or loss... no change of direction during the roll

Try moving the CG back slightly. Most trainers are set up nose heavy and this increases the drag due to the increased demand on the horizontal stabilizer.

Slow roll.. i like never really perfected them il work on those (i used to do them witht the instructor but he would always freak out so i stoped)

I have a lot of stick time on an alpha 40 and it just doesn't like to do outside loops. Try an 11x4 prop on it and tune it right, start with a slight dive, and you can barely make it over the top....but it isn't pretty. Also, it won't slow roll very well either. A plane that is more aerodynamically neutral will be much easier to learn on. Have fun with the Alph though. It's a great plane!

most flat bottom wing don't do outside stuff well
If it was me I would work on my landings till they are automatic
that seems to be the biggest thing people struggle with when they move to there next plane
practice landing with rudder only it will pay off big when you move on to a low wing plane that tends to stall with aileron corrections at low speeds
remember the rudder is the last flight control to stop flying