India Four Two, it's not so simple. The NASA diagram speaks of PRESSURES, but what we need to know is FORCES, and a force is =
Pressure times Area.
And every pressure is acting on a different area. Doing the sums is quite a bookkeeping exercise, I've done it a time or two, and in the preliminary design phase the uncertainty of each element in the summation is so great that you're never quite sure which direction the thrust bearing is loaded - fore or aft!
(Think of a tug of war between two teams of elephants...)
