RE: Royal B17 kt
I had a friend that built 2 in college. During Take off we would always stand behind him. It would always take a hard left or right durring take off. It depended on the last engine to spool up or the last wiggle in the tail. It always took off 90 degrees to the runway. Good thing was that when all four engines are up it is flying. He was a bit wild then but it flew well beyond that.