Thanks a lot guys.... I really appreciate your comments and advices.

ahicks: Actually it was not that easy to come to this forum and learn that the throttle worked that way (compared with nitro is different). It took me to fly with a 10oz tank for 10mins at 40-50% throttle stick thinking that I was flying at actually 50% throttle carb (when I was actually flying at full throttle all time and burning all my gas!) and running out of gas just before landing and crashing. hehehehe [&o] Now I replaced the tank by a 12oz tank but I think I should be fine for a 9mins flight flying at different throttle openings and not full throttle since the beginning!.

I have a Heli DX7 and it has the throttle curve function for the helis setup but I think it doesn't have it for the airplane set up. I was looking for it yesterday and nothing. Thus, I think I will go for the diagram linkage set up which makes sense and I will try to play around with the ATVs to fine tunning.