[hipollito]

I fly in Toluca Mexico 8500 feet, and yeah what these guys siad, its going to be harder for the engine to pull the plane, I always usea a bigger engine, for example u can do .60 with a 1.20 or showtime .90 with os 1.60, usually all .40 planes use .46 or .60 haven´t flown gas there so I cant tell you about that, right know Im flying at 1500 feet, because Im studying in another state, and I can tell its veeery different, for me its a lot easier to fly over here at 1500 feet, but you will get used to it and you are going to make some good responsive fingers..... you will notice that when you come back to flying in a low altitude field!!!