Coming off a 17 " 180 degree vertical bucket elevator, I need a downward slope angle of 65 degrees. How long would my pipe need to be to move right 1.5 feet? what is the height from ground, at the end of that pipe (ie. 14.8 feet")?

Man. I think you mean

17' elevator (17" isn't very tall!)
90° (vertical)

1.5/x = cos 65°
h/17 = sin 65°

But these don't look right. Maybe if you explain things a bit more.