For the rotating sprinkler of Example 4.13, what value of \(\alpha\) will produce the maximum rotational speed? What angle will provide the maximum area of coverage by the spray? Draw a velocity diagram (using an \(r, \theta, z\) coordinate system) to indicate the absolute velocity of the water jet leaving the nozzle. What governs the steady rotational speed of the sprinkler? Does the rotational speed of the sprinkler affect the area covered by the spray? How would you estimate the area? For fixed \(\alpha\), what might be done to increase or decrease the area covered by the spray?

Data From Example 4.13

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h Point O 75 V -113 P4.140