I relieze there are many variables and only an approximation is possible, but giving the following situation, what formulae are required and what are they:

I have a stream of water flowing through a nozel rotated in two axis (theta, and ???( up and down rotation) by motors. I need to calculate (based on the angle of launch) the approximate distance traveled by the stream assuming no wind. The pressure constant needs to be determined by trial and error(ie, it would fire a stream at a specified angle and i would give it the distance traveled.

Is this possible at all? and if so, are there also equations for calculating water pressure changes as the diameter of the pipe changes?

Thanks