Shell propellers NYT crossword answer is:
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Shell propellers are a type of propeller used in marine vessels, such as boats and ships, to create thrust and propel them forward. They are usually made of metal, such as bronze or stainless steel, and feature a series of curved blades that rotate around a central hub. Shell propellers are an important part of a vessel's propulsion system, and are often used in combination with other propulsion systems, such as diesel engines.