Charles Sheeler is a bit of an outlier. He is commonly seen as a proto-photorealist, employing many of the same techniques to create photorealistic canvases that the photorealists would later use, but he also created a fair amount of more abstract work that can be lumped in with the Precisionists, a group of American painters working in the 30s and 40s.
This painting, Yankee Clipper, is part of a series on 'power' commissioned by Fortune magazine. With these works you can see hints of abstraction, or an unearthly cleanliness; the subjects of Sheeler's paintings are idealized and lack the flaws and imperfections that all material objects must have.
Maybe I'll delve deeper into another of his paintings another time.