Use these free clip art images for your collections, school projects, website art and more. When checked, Shutterstock's safe search screens restricted content and excludes it from your search results. The "Quiet Bird"—Boeing's secret project designated Model 853—on a trailer at Boeing's Wichita research center in 1962.
A schematic of the Quiet Bird shows that it was intended to have a "variable density" material used for its outer skin to reduce radar reflectivity. It may have influenced the design of Boeing's AG-86 Air-launched Cruise Missile, originally developed in 1974. Lockheed Martin's F-117A 'Nighthawk' Stealth Fighter was the first stealth combat aircraft to fly; its angular shape was driven by the limits of computer modeling in the late 1970s.
More than two decades before the first flight of the F-117A "Nighthawk" stealth fighter—and two years before Russian mathematician Pyotr Ufimtsev would publish a paper first defining the physics that would drive development of stealth aircraft—engineers at Boeing's Wichita, Kansas, facility performed tests on an experimental design that might have been the first stealth aircraft ever. Built with a non-metallic skin of a "variable density" material, the Quiet Bird model was tested and refined during radar cross-section tests at Wichita over two years. According to Boeing, the Quiet Bird was originally built as a prototype for an Army scout plane study. However, some of the design elements of the Quiet Bird may have influenced Boeing's AGM-86 Air Launched Cruise Missile. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Conde Nast.


If you can't find the clipart your looking for then please do not hesitate to get in touch and we will gladly help. According to images and information just recently released by Boeing, the company performed testing on a stealth aircraft prototype in 1962 and 1963.
This factor, given the inter-service politics defined by the 1948 "Key West Agreement" (PDF) that put jet fixed-wing aircraft purely in the domain of the Air Force, may have doomed it from the start. And the project fueled other work within Boeing on non-metallic and composite construction. See, for example, Tacit Blue.When I first saw these images, I thought Boeing had screwed up their information.
Keeping it company is an YF-23, an XB-70, the X-3 experimental plane, and all sorts of other neat stuff.
Now, what would have inspired them?A better logical assumption was that they stumbled on something very visually similar to modern stealth design by happenstance and convergent design; modern stealth fighter designs are aerodynamic first and stealthy afterwards, because we have the computational power to do that AND the theory behind RCS (Radar Cross section) reduction available. If you'd shown me these pix out of context without Boeing's background text, I would have figured it to be a modern stealth demonstrator. And the military was apparently not all that interested in stealth technology in the early 1960s, according to the notes Boeing published with the images.
The craft's planform looks much more like a modern stealth aircraft, especially in the high domed cockpit and the curved surfaces.


In the 1960s, this was a reasonably aerodynamic design that happened to have a lower than normal RCS.
However, it demonstrated the effectiveness of design and construction approaches that would later be applied to stealth aircraft. Similar design coincidences happened before: the B2 is a stealthy flying wing, but the much earlier Northrop YB-49 (1947) looks remarkably similar, and IT was based on the even earlier flying wing designs by Horten.
It wasn't until the supercomputer-assisted design of the B-2 that stealth began to build in curves.This thing, the Quiet Bird, looks like a modern stealth demonstrator.
The rough science behind RCS reduction was vaguely understood in the 60s (Ufimtsev's landmark paper on the subject was published in 1962, after all, and as has been pointed out even the Blackbird family of aircraft incorporated some RCS-reducing features), but this thing looks like a product of the 90s than the 60s.
That said, if, based on what you are saying, they could not have come up with this design in the 60s and considering that something similar would only fly in the 90s, the ony logical assumption I can make is that they built that inspired by something they came upon and it didn't go to production either because they couldn?t make it work as they wanted or the cost was not feasible.



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