13856780

Wall Art and Photo Gifts from Mary Evans Picture Library

13856780

Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries

Media ID 32300682

© Aviation Ancestry

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> Historic > Monuments and landmarks

> Mary Evans Prints Online > New Images July 2023

VISUAL DESCRIPTION
This image shows a historical document highlighting "Landmarks in Propeller Development" by de Havilland Propellers, a division of the British aerospace manufacturer de Havilland. The document lists three significant milestones: 1. In December 1946, the first manually-variable-pitch propeller developed by de Havilland was officially type-approved in Britain. 2. By January 1947, they achieved another milestone with their variable-pitch propeller being the first globally to be officially approved for turbine installation. 3. Finally, in April 1947, de Havilland's constant-speed feathering and braking propeller became the first British braking propeller to receive official type approval. The text is overlaid on what appears to be an aged paper background with some wrinkles and signs of wear. Each achievement begins with a stylized "First. . . " emphasizing the pioneering nature of these developments at that time. The company logo (D. H. ) is visible at the bottom along with "DE HAVILLAND PROPELLERS, " indicating that this document was likely used for promotional or informational purposes to showcase technological advancements made by de Havilland in aviation propulsion technology during the late 1940s.

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