File:D-558-2 Dropped from B-29 Mothership - GPN-2000-000251.jpg

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Description	English: The D-558-2 #2 is launched from the P2B-1 in this 1956 NACA High-Speed Flight Station photograph. The D-558 Phase Two aircraft was quite different from its Phase One predecessor, the Skystreak. German wartime aeronautical research records, reviewed in 1945 by Douglas Aircraft Company personnel, pointed to many advantages gained from incorporating sweptback wing design into future research aircraft. These findings along with wind tunnel studies performed by the National Advisory Committee for Aeronautics (NACA) at Langley Memorial Aeronautical Laboratory, resulted in the modification of the straight wing D-558-1 Skystreak contract to include investigation of sweptback wings. Three redesigned aircraft were built by Douglas Aircraft Company under a contract from the Navy Bureau of Aeronautics and named D-558-2 Skyrocket. Originally all three were designed for ground take-off and used mixed power propulsion systems, consisting of a turbojet engine for take-off and a rocket engine, for greater speed in flight. The early flight tests were made using only the turbojet engine with the rocket engines added, when available. As the flight program evolved, only one D-558-2 ended-up powered by a mixed rocket and turbo-jet propulsion system. From the experience gained during the X-1 rocket program and from Skyrocket mixed propulsion flights, the Navy and the NACA proceeded to have all three of the D-558-2 aircraft modified for air launching from a Navy-operated P2B-1 Superfortress (Navy version of the Air Force B-29), later becoming NACA 137. Although not designated an "X vehicle," the D-558-2 was essentially an X-vehicle aircraft in design and function, and contributed much to aeronautics research.
Date	1950s date QS:P,+1950-00-00T00:00:00Z/8
Source	Armstrong Photo Gallery: Home - info - pic Great Images in NASA: Home - info - pic
Author	NACA

This image or video was catalogued by Armstrong Flight Research Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: E-2478.

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This image or video was catalogued by Great Images in NASA of the United States National Aeronautics and Space Administration (NASA) under Photo ID: GPN-2000-000251.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

Other languages:

العربية ∙ беларуская (тарашкевіца) ∙ български ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ galego ∙ magyar ∙ հայերեն ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−

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	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	01:05, 7 September 2015		5,100 × 4,000 (1.77 MB)	Innotata (talk \| contribs)	Transferred from en.wikipedia
	22:11, 8 April 2009		3,000 × 2,343 (3.3 MB)	BotMultichillT (talk \| contribs)	{{Information \|Description={{en\|1=The D-558-2 #2 is launched from the P2B-1 in this 1956 NACA High-Speed Flight Station photograph. The D-558 Phase Two aircraft was quite different from its Phase One predecessor, the Skystreak. German wartime aeronautic