Here is one very important thing I haven't seen mentioned here: angling the motor slightly down and to the right only applies to motors that spin counterclockwise when viewed from the front. This is to reduce torque related issues, and so, if you angle a clockwise spinning motor down and to the right, you will get even worse torque issues. I made this mistake on my first plane, and I couldn't even get it in the air before it was destroyed. For a clockwise spinning motor, angle it down and to the left, and you should be fine.