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13863821
Wall Art and Photo Gifts from Mary Evans Picture Library
13863821
Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries
Media ID 32307814
© Aviation Ancestry
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VISUAL DESCRIPTION
This vintage advertisement showcases the technological innovation of Rotol Feathering Airscrews, emphasizing "Conservation of Energy" as its main selling point. The graphic illustrates a pie chart with dynamic segments representing different operational states such as feathered, constant speed, and fine pitch operation. Below the chart is a detailed diagram of the mechanism that enables this energy-efficient feature—a constant speed unit paired with a feathering pump. The ad highlights how these airscrews can transition to a feathered state in just five seconds, promising current economy for aircraft operators seeking performance and efficiency.
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