Sorry . . . i thought you were saying this was THE ideal plane angle . . . misunderstood . . . apologies . . . can you field this one though? What is the impact on the HSP and Angle of Attack as the plane angles go from "steep" to "flatter" if other variables are held constant (not sure the can)?
No problem. Again, the HSP (Plane Line) is not affected by a change to the vertical angle of the plane, either steeper or flatter. The Attack Angle will depend on WHERE impact is made on the plane. But, if impact is made at the same distance before Low Point, then the Attack Angle will be more descending when the plane is closer to vertical (steeper).