The Real X-Jet
From Transformers to the X-Men, the Blackbird is still Hollywood's favorite futuristic jet. Here's the real story of its birth.
- By William E. Burrows
- AirSpaceMag.com, March 01, 1999
(Page 6 of 7)
While the U-2 was given a very simple ECM system, says Thomas, the SR-71’s electronic bays were crammed. All of the ECM equipment, plus the SR-71’s nose-mounted high-resolution optical bar camera and its side-looking radar and other sensors, were operated by the reconnaissance systems officer, or RSO, who sat behind the pilot. The CIA’s A-12 had one pilot who ran everything, but the Air Force decided that the load was too great, so it had the Skunk Works make room for the RSO.
That change and others created real differences in both airplanes’ performances. The A-12 actually flew up to 5,000 feet higher than the SR-71, was a bit faster, and had cameras that could cover three times as much territory with better resolution. The penalty for adding a crewman was a smaller camera. “The A-12 was like the U-2,” says Bob Murphy, the SR-71 plant manager. “It had a massive camera, a very, very large camera, whereas in the SR-71, the second guy sits where the massive [Type I] camera went in the A-12.”
Whatever its limitations relative to the A-12’s camera, the SR-71’s was by all accounts good enough. According to Ben Rich, it could peer more than 130 miles into a targeted territory. It is still used on U-2s and remains classified. The SR-71’s performance was also somewhat reduced by the side-looking radar it carried, plus gear that collected electronic and communication intelligence by sniffing out radars and listening to radio transmissions.
The CIA’s contract for the A-12 specified that it have very-low-observable qualities but not that it be completely stealthy. Still, the low-observable specification was a problem that had to be solved before the contract was finally signed in February 1960. Its blended body reduced its radar reflectivity dramatically. Its overall shape, including the two vertical tails that cant inward plus lots of curves, helped to hide it. So did special radar-absorbing plastic panels made of silicone and asbestos that had to be formulated to withstand temperatures of roughly 550 degrees.
What was more difficult, according to Thomas, was shaping the surfaces so that they intercepted, captured, and absorbed or redirected radar signals. The trick was to guide the radar signal around the aircraft before either dissipating it or redirecting it. He describes the plastic panels as a series of gradually phased “steps” that accomplished this with exquisite nuance. “An enormous amount of invention had to go into this thing,” Thomas says, “and it was all done simultaneously in a matter of 31 months.” And, as almost everyone who was involved likes to point out, nearly all the engineering was done with slide rules and calculators rather than computers.
Besides creative genius, Kelly Johnson had an aggressive and practical business sense. When he thought up the A-12, he saw the airframe as the equivalent of a basic automobile chassis that could be assembled as a sedan, a convertible, or a station wagon. The key was to use different forward fuselages on the same basic body, wing, and tail. The separation point was at Frame 715, which connected the wings at the roots of their leading edges. Everything behind 715, including the nacelles and their inlets and engines, remained essentially the same while the forward fuselages differed. The basic design was therefore turned into a long-range missile toting interceptor called the YF-12. Another version, the M-12, carried a ramjet-powered, camera-carrying drone called the D-21 on its back. “M” stood for mother; “D” for daughter. The thing was used briefly over China with mixed results and one of the D-21s destroyed the M-12 that carried it when it slammed into the aircraft during separation.
There were even plans that never materialized for a penetrator version that could have carried nuclear missiles. Pratt & Whitney’s Joseph Daley says that the Soviets at the Strategic Arms Limitation Talks in the late 1960s insisted that it not be built because “if it was used offensively, there was no way in the world you could defend against it.”
And there was yet another permutation—a bizarre one. SR-71 lore has it that the airplane was really designated RS, for Reconnaissance Strike, but that President Johnson mistakenly called it the SR when he announced it in 1964; the name stuck and it became Strategic Reconnaissance.
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Comments (9)
Bouroughs did a great job of describing the machine development. However he did overlook the J-58 engine's need for a ground based Starter Cart (2 Buick Wildcat V-8s) and that the JP-7 required an "exotic" igniter called TEB ( Tri-Ethyl-Borate).
To see some of the personal experiences on the A-12, go to the following web sites:
http://www.habu.org/a-12/06932.html
http://www.wvi.com/~lelandh/m21_Crash.html
http://www.roadrunnersinternationale.com/oxcart_pilot_training.html
There are a number of pilot's stories under the Roadrunners...
Posted by Edward Power on June 11,2011 | 12:26 PM
This is a very interesting piece. I am a retired Navy Civil Servant. I was an electronics engineer for 25 yrs with the Navy Civil Service. My Dad worked for Lockheed during the Kelly Johnson years. He was superintendant over the skunk works tooling dept, 3rd under Kelly Johnson. His name was Edwin C. Mort. He passed away early January of 1989.
This piece answers many questions I have had about the "Black Bird".
Posted by Richard E. Mort on June 11,2011 | 08:58 PM
My father worked for General Electric from 1945-84
and did work with a lot of other companies during
that time.
One such company was the Skunk Works during Kelley Johnson's time and I remember the Blackbird being
refered to as the YF-12A.
My father worked with a lot of space exploration programs(Including the X-15 during Harrison "Stormy" Storms time)
defense projects and commercial aviation jobs(The SST program with Boeing until President Nixon axed it in 1971)
I've always been interested in what my father did BUT just
didn't have the math or science knowledge to persue it. I
still read LOTS of science fiction. Sir Arthur C Clarke
was both our favorite author.
My father lived from 1919-1995 and I was born in 1949.
Thanx! for letting me ramble on a bit.
Great piece on the Blackbird...
06 16 11
Posted by Don Ducker Jnr on June 16,2011 | 09:11 AM
Now 12 years later Annie Jacobsen has written Area 51, and in there is a lot of information about Oxcart, the Skunkworks and other formerly classified projects.
Posted by PeterK on June 23,2011 | 05:54 PM
The SR-71 also served as the artistic inspiration for a cover illustration (http://www.isfdb.org/wiki/images/a/a9/ANLGJUL68.jpg) for a novella by Dean McLaughlin in the July 1968 issue of Analog Magazine. The artist was the late Frank Kelly Freas who depicts an SR-71-like aircraft looming over WWI fighters as a result of the 20th Century airplane arriving unexpectedly over France in 1918. The story somewhat humorously depicts the frustration of the modern airplane's sole pilot who discovers that his modern missiles can't shoot down wood and fabric biplanes with tiny radial engines.
Posted by Diana Powe on June 24,2011 | 05:33 AM
Excellent work Mr.Burrows. Nothing captures my imagination like the Blackbird. Not even my beloved Corsair.
Marines are the reason I don't speak Japanese.
Soldiers are the reason I don't speak German.
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If it were not for the United States Military,
There would not be a United States of America.
Freedom comes at a price. Remember those who paid it.
Posted by Hank Armstrong on June 24,2011 | 10:19 AM
It is just breathtaking to think of the 'Murderers' Row' of engineering, design, and fabrication talent that Kelly Johnson surrounded himself with in the 50's and 60's at Lockheed's SkunkWorks. Of course, the Cold War-driven unlimited budgets and different gov't/defense contractor relationships of that time enabled a lot of innovation, but to imagine the history-altering aircraft these guys dreamed up and built is just amazing. With slide rules and calipers and feeler gauges . . . .
Like Ben Rich spoke about in his book, SKUNK WORKS, these groups of guys in white shirts and ties and pocket protectors, justifying their blueprints over cigarettes and coffee and slide rules to crusty, seen-everything fabricators whose experience tempered their ideas must have been an intoxicating atmosphere. I often think THAT's why it was buried behind layers of Black World secrecy: They were just having too much fun making history, one rivet at a time.
Posted by Joey Wilson on July 8,2011 | 01:20 AM