Sprayer systems with drop apparatuses having retractable arms

An agricultural work machine, comprising:

• a chassis;
• an engine mounted on the chassis for propelling the work machine;
• a boom extending from at least one side of the chassis;
• and
• a sprayer system comprising:
• a tank coupled to the chassis;
• an air source coupled to the chassis;
• at least one spray device arranged to selectively apply a fluid from the tank to an agricultural crop;
• and
• at least one drop apparatus comprising:
• a retractable arm with a first end coupled to the boom and a second end coupled to the at least one spray device, the retractable arm including a first arm segment, a second arm segment, a first hinge joint positioned in between the first arm segment and the boom such that the first arm segment is selectively foldable relative to the boom, and a second hinge joint positioned in between the first arm segment and the second arm segment such that the second arm segment is selectively foldable relative to the first arm segment;
• and
• an actuation assembly coupled to the retractable arm to selectively fold and unfold the first arm segment relative to the boom at the first hinge joint and the second arm segment relative to the first arm segment at the second hinge joint based on air pressure from the air source.