Dear john/topshelfl,

thanks a million,

Ive tired this CG SOLUTION & come to this conclusion.
At empty fuel tanks the tail is slightly heavy around 15 to 20gms,so I put the battery in the front of the CG.Now I find a very slight diffrence i.e nose up by 25 to 30 degree,if I had may be 10 to 15 gms ,this is solving the problem,also checked with the landing gears change the wheel & used foam wheels (made of hard sponge)this perfectly works.

will check CG now with half tank empty may be 150ml & then fly the model.will keep you updated.

Ive already ORGANSIED the time problem with a alarm clock & Ive decided NOT to fly more than 15min to 20min on full tank & on half tank just 8min,

can you help in adv how to perfectly check that rudder/elavator & most of all the alerions are properly straight?any sight or diagrams.As I learnt one simple method of checking with a ruler seeing that both elavators sides are parellel to the rulers & also I do the same with rudder & Alerion(but find it little confusion with alerion(any suggestion)