My favorite also rally2. I was thinking the same thing today about warbirds after watching wwII dogfights on the history channel. I wonder how id go about building a gullwing f4u? haha. Would be a cool challenge. As for the the thrustline. I have 2 blenders. 1 swappable. the swappable has 5 dgrees right and 3 down and the other is straight motor mount. Neither one has any torque roll problems.