How do I knw the rotor blades are on at the right angles?
Actually, this is not something you need to worry about (as long as you have the leading edge facing the right direction!). Once the rotors start spinning, centrifugal force will pull the blades into their proper positions. You will usually see the helicopter start to wobble as you spin up the blades, then smooth out. The wobble comes from the imbalanced caused by different blade lead/lag angles, and the smoothness comes when the blades have both been pulled into position. Different kinds of blades will have different lead-lag angles, depending on the chordwise position of the blade’s center of gravity (closer to the leading edge, or closer to the trailing edge) and the shape of the blade’s airfoil. As long as the blades are well matched (chordwise and spanwise CG, airfoil, weight), you can expect them to ‘seek’ identical lead/lag angles.
