Think of putting a Paddle on the engine instead of a prop. If the paddle was with the rotation there would be very little torque because the wind moves cleanly past the paddle. Turn the paddle 90 degrees and think of all the torque caused by the drag. Or think of your planes wing. It doesn't like to fly in directions other than the way the wing is facing (Excluding 3D stuff of course!). A "Wall" (3d) is a perfect example of this idea!

Phil (Mesa, AZ)