File:United Air Lines Boeing 247 Prop NASM-C5F9432C2DC32 004.jpg
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Captions
Captions
United Air Lines Boeing 247 Propeller
Summary
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| Description |
English: The variable-pitch propeller advanced safety and efficiency of aircraft by providing a "gear shift of the air." Its dramatic improvement in performance won Frank Caldwell and Hamilton Standard the 1933 Collier Trophy, bestowed by President Roosevelt for the National Aeronautic Association at the White House. This artifact is a specimen of that technology, and was the first of its type to achieve over 2500 hours of flying service.
The propeller flew on a United Air Lines Boeing 247 aircraft, which is generally recognized as the first civil aircraft to embrace features providing economic advantage such as all-metal construction, fully cantilevered wing, wing flaps, and retractable landing gear. However, with fixed pitch propellers, the early version of the aircraft had difficulty at high-altitude. With this controllable, two-position propeller beginning in June 1933, climb rate grew twenty-two percent, take-off distance improved twenty percent, and cruising speed increased 5.5 percent to 274 km/hr (171 mph). |
| Date | circa 1933 |
| Source | https://airandspace.si.edu/collection-objects/propeller-controllable-pitch-two-blade/nasm_A19350039000 |
| Author |
Unknown. The variable-pitch propeller advanced safety and efficiency of aircraft by providing a "gear shift of the air." Its dramatic improvement in performance won Frank Caldwell and Hamilton Standard the 1933 Collier Trophy, bestowed by President Roosevelt for the National Aeronautic Association at the White House. This artifact is a specimen of that technology, and was the first of its type to achieve over 2500 hours of flying service. The propeller flew on a United Air Lines Boeing 247 aircraft, which is generally recognized as the first civil aircraft to embrace features providing economic advantage such as all-metal construction, fully cantilevered wing, wing flaps, and retractable landing gear. However, with fixed pitch propellers, the early version of the aircraft had difficulty at high-altitude. With this controllable, two-position propeller beginning in June 1933, climb rate grew twenty-two percent, take-off distance improved twenty percent, and cruising speed increased 5.5 percent to 274 km/hr (171 mph). |
Licensing
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:39, 27 April 2020 | | 900 × 207 (173 KB) | Peteschulz210 (talk | contribs) | Uploaded a work by Unknown. The variable-pitch propeller advanced safety and efficiency of aircraft by providing a "gear shift of the air." Its dramatic improvement in performance won Frank Caldwell and Hamilton Standard the 1933 Collier Trophy, bestowed by President Roosevelt for the National Aeronautic Association at the White House. This artifact is a specimen of that technology, and was the first of its type to achieve over 2500 hours of flying service. The propeller flew on a United Air... |
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