Variable airfoil profile hollow wiper arms

A wiper apparatus comprising:

• a wiper axis interface configured for mounting a wiper assembly to a wiper drive;
• and
• a lower wiper arm extending from the wiper axis interface to a wiper mount that is configured to connect the lower arm to an upper arm, wherein a first end of the lower wiper arm proximate the wiper axis interface has a first airfoil profile, wherein a second end of the lower wiper arm proximate the wiper mount has a second airfoil profile, and wherein an intermediate portion of the lower wiper arm extending between the first and second ends has a transitioning airfoil profile that transitions from the first airfoil profile to the second airfoil profile, wherein an outer wall of the lower wiper arm is defined about a hollow core of the lower wiper arm, wherein at the first end of the lower wiper arm, the outer wall has a first wall thickness, wherein at the second end of the lower wiper arm, the outer wall has a second wall thickness different from the first wall thickness, and wherein along the intermediate portion, the outer wall has a transitioning wall thickness that transitions from the first wall thickness to the second wall thickness, wherein the hollow core terminates at a first bore opening into a connector bore of the wiper axis interface, wherein the hollow core terminates at a second bore opening into a clevis of the wiper mount.