Gates said then he had every intention of re-starting the initiative when the Air Force had done more analytical work on what it needed the plane to do, and what kind of platform it might buy.

The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.

Using the analytical relationship, many boundaries namely scissors sketed, could be drawn on the parameter plane of horizontal tail area and aeroplane center of gravity.