File:Keystone Y1B-4 (SN 30-281).jpg
![File:Keystone Y1B-4 (SN 30-281).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Keystone_Y1B-4_%28SN_30-281%29.jpg/800px-Keystone_Y1B-4_%28SN_30-281%29.jpg?20070425171824)
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Summary
editDescriptionKeystone Y1B-4 (SN 30-281).jpg |
English: Keystone Y1B-4 bomber, serial number 30-281. This aircraft was originally the first Keystone B-3A to be built; it was converted into a Y1B-4 by adding larger, more powerful Pratt & Whitney R-1860-7 Hornet B radial engines, as well as low-pressure tires. |
Date | early 1930s |
Source | U.S. Air Force photo [1] from the image gallery on the website of the National Museum of the United States Air Force. |
Author | USAF |
Licensing
editPublic domainPublic domainfalsefalse |
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This image or file is a work of a U.S. Air Force Airman or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image or file is in the public domain in the United States.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:18, 25 April 2007 | ![]() | 1,800 × 1,209 (188 KB) | Piotr Mikołajski (talk | contribs) | Keystone Y1B-4 (S/N 30-281). The first B-3A was converted to Y1B-4 configuration with the addition of R-1860-7 radial engines and low pressure tires. Image taken from [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2439 National Museum of t |
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- File:060421-F-1234P-009.jpg (file redirect)
- Category:Keystone B-4
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Image title | Keystone Y1B-4 (S/N 30-281). The first B-3A was converted to Y1B-4 configuration with the addition of R-1860-7 radial engines and low pressure tires. (U.S. Air Force photo) |
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Headline | Keystone Y1B-4 |
IIM version | 2 |