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Modern commercial vessels are typically powered by a single propeller driven by a diesel or, less usually, gas turbine engine.,[3] but until the mid-19th century they were predominantly square sail rigged. The fastest vessels may use pump-jet engines.[citation needed] Most commercial vessels such as container ships, have full hull-forms (higher Block coefficients) to maximize cargo capacity.[4] Merchant ships and fishing vessels are usually made of steel, although aluminum can be used on faster craft, and fiberglass or wood on smaller vessels.[5] Commercial vessels generally have a crew headed by a sea captain, with deck officers and engine officers on larger vessels. Special-purpose vessels often have specialized crew if necessary, for example scientists aboard research vessels.