A tine device (130) for an impeller apparatus is disclosed. The tine device (130) comprises at least one tine element (230, 230a, 230b) having a first end configured to be rotatably coupled to a central rotor (120) of the impeller apparatus. The tine element (230, 230a, 230b) additionally comprises a second end positioned on a first side of a radial line extending through the first end, and a curved portion located on an opposite second side of the radial line between the first and second ends.
