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In page Monoplane:

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On flying boats with a shallow hull, a parasol wing allows the engines to be mounted above the spray from the water when taking off and landing. This arrangement was popular on flying boats during the 1930s; a late example being the Consolidated PBY Catalina. It died out when taller hulls became the norm during World War II, allowing a high wing to be attached directly to the hull.[citation needed]