RE: How do you determine what size of servo to use?
Personally, anything over a 60 size gets more that the "standard" servo. Then when you get into the nicer planes it is digitial all around. I am a bit different myself. What I have discovered is this
1-When your engine quits, you glide it in and go pick it up
2-When your servos quit, you get a trash bag and your friends help you pick it up.
morral of the story-- servos are important.