hI John,

Good morning to you but here in India is 7.45pm.

thanks for your prompt reply.

you exactly right,without fuel the tail is heavy may be 25grams of wt correct the balance.

I really did not understand moving the CG FRONT/BACK,how does one do that ? (pls excuse me as Im a novice at the CG,
When I do the wing along the spar & lift the model. the tail drops slightly down.but after filling fuel the nose getsvery little heavy not a worry about nose.

Should I use half tank fuel or change the fuel tank from 250ml to 180ml????

As I tested the model on ground with 250ml fuel,it runned continiously for 36min at medium throttle.I want to see how long can this fly in air & understand when to land?

need you expertise.

also will need to chop the grass as I cannot get bigger wheels than 2.5inches & the bigger the wheeels more the wt,if im not wrong.