...
The effective length of link 4 (c) and the angular offset (delta) between link 4 and the output vector P can be determined from a geometric analysis of the lengths c1, c2, and the relative angle beta, as defined in the figure.
This has the effect of modifying the output sweep between left side only, right side only, full range, narrow centered, and various intermediate combinations.
...
Also, the velocity analysis suggests there are further nonuniformities in the water distribution. It is particularly noticeable in the full sweep, where the water nozzle travels much quicker through one phase of the right side portion, possibly resulting in less dense water distribution to that portion of the yard and in a slightly larger area compared to the left (due to the position sweep asymmetriesright bias).
Overall, the sprinkler is effective in controlling its output range as designed, in spite of slight inconsistencies.
...