Hi I have the superstar EP as a trainer could someone tell me why it is not stable! And what you get for flight times and if you have any upgrades on it?

I don't have the EP version of the Superstar, but I do have the 40 sized ARF. It is extremely stable, when set-up following the instructions, and trimmed out by an accomplished instructor. Do you have any help on learning to fly it? Flight times for the EP should be between 8 and 15 mins, assuming that once you have taken off and gained altitude that you back off the throttle. My 40 sized will fly a long time on 1/3 throttle.

I use full throtle and get 30 mph while training at that other wise while i'm learning I seem to put the plane into stall moves at 1/4 throttle but the guy that trains me flys it at walking speed in 10 mph wind at 1/8 throttle.

If you are stalling at 1/4 throttle, but your instructor can fly at 1/8? Probably means you are pulling too much elevator. Your instructor should be correcting you if you are pulling too much.

while he's 84 and i'm 13 and he has a large scale plane license and flew in 2 wars

Watch the way an experienced pilot moves the sticks for smooth laps around the field. It takes VERY small stick movements to fly the model.

Another place that may make it seem unstable to a beginner (even if properly trimmed) is you may be holding the stick off center too long,,, then when the plane continues to bank further, you input MORE in the opposing direction and soon end up slamming the stick from side to side. A way to see that you don't need to hold the stick over (but a bad habit to get into...) is the bump and watch method of flying the model. Bump the stick and let go... watch the result. Bump to make any correction... and watch the result. Its a sloppy flying technique... but it helps prevent overcontrolling. If the airplane is trimmed for level flight and you bump the stick... it will give a visible response.

Properly trimmed (with just a few clicks of rudder trim from straight and level) a trainer will fly lazy circles as long as you let it. The more gentle you are with the controls... the less trouble you will have.

ok

One other thing that should help is a simulator. FMS is a FREE D/L. You use your transmitter and have to provide ant interface cable (about $20)