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Travel Diaries: The XB-70A

8/6/2016

 
It's been a long day, mostly spent driving. This time I'm en route from Detroit, MI, to Columbia, SC. The main goal is to get me and the truck back home, but (again thanks to my wife) there's some extra time built into the journey. I was on I-75 for most of the day and am now in an Econo Lodge in an undisclosed location in eastern Tennessee with some KFC and beer. I'll skip over my stories about the new Against Me! song and sob story hustlers at a rest stop in Kentucky and get to the most interesting part of the day: an awesome technological artifact on display at the National Museum of the Air Force in Dayton, Ohio.
The XB-70A Valkyrie

If you're interested in military aviation history but you've never been to the USAF museum in Dayton, Ohio, you owe to yourself to get there at some point. As the official museum of the Air Force, they have access to a lot of unique aircraft that you just can't see anywhere else. I made my second visit today, specifically to visit the newly-opened fourth building housing the only XB-70 in the world. The "X" designation is given to aircraft that are experimental.
PictureXB-70A in the National Museum of the Air Force, Dayton, Ohio.
​The XB-70 is a captivating aircraft: graceful, powerful, and unlike anything else that was every built (well, with the exception of the Soviet's attempt to copy the design). It was the result of a perceived need in the 1950's for a long range heavy bomber to deliver nuclear weapons from an altitude and with a speed that would make it immune to being intercepted. The B-70 program was killed by the double whammy of the development of ICBMs (inter-continental missles could deliver nuclear warheads more efficiently than manned aircraft) and the development of increasingly effective surface-to-air missle technology that could bring down even high altitude aircraft. Although the bomber program was killed, two XB-70's were built as research aircraft. They flew from 1964 to 1969, one being destroyed in an accident in 1966. You can read about the development and history of the XB-70 on Wikipedia. This video also tells the story.

I've been fascinated by photos of the XB-70 since I was a little kid and it was a thrill to see it in person (I was delighted to find that many other unique experimental aircraft that I'd only ever seen in pictures were also on display in the new building -- really amazing). As a technological artifact, this vehicle marks the endpoint of the evolutionary trend of bombers going faster and higher. It was designed to fly at Mach 3 with a ceiling of 70,000-80,000 feet (depending on the source). Just over sixty years after the Wright brothers first flew their aircraft a total of distance of 120 feet at about 6.8 mph, humans had produced a flying machine that could surf through the stratosphere on its own shockwave at three times the speed of sound. 

The chess game of military aviation took design in new directions after the 1950's, leaving the B-70 as a design that was strangely both ahead of its time but also obsolete. The B-52 (which the B-70 was supposed to replace) is still in service, and emphasis is on producing bombers that can fly low  (such as the B-1B) and/or use stealth technology (such as the B-2) to avoid radar detection. The newly announced B-21 is a stealthy, sub-sonic design that aims to evade detection rather than outfly it.

I think the phenomenon of advanced "orphan" designs like the XB-70, produced at the very edges of technology but also not terribly useful, may be more common than we might guess. Technologies change, and once common ways of doing things often persist in niche roles. The "survivors" however, are not the most developed expression of a technology.  I had a 1987 Dodge Colt, for example, that had a very complicated feedback carburetor. Fuel injection has replaced carburetors in automobiles, but carburetors are still used in numerous other applications. But neither my chainsaw nor my lawnmower has a feedback carburetor like the one on a  1987 Dodge Colt. I can think of other examples. The most "advanced" examples of technology occur not at the end of a technological tradition, perhaps, but at the "peak" of its use. Just a thought.

Tomorrow I'm hoping to see a perpetual motion machine from the Civil War. It's going to be hard to top finally getting to see the XB-70.


Here are a few additional photos I took of experimental aircraft on display in the National Museum of the United States Air Force. Here is a map of building four showing the locations of the aircraft. Many of the "X planes" on this list are present.
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View of the ailerons and six engine outlets of the XB-70A. The X-4 (1948) is hanging from the ceiling to the right.
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A Bell P-59B, the first operation U.S. jet aircraft. It was developed during WWII but not deployed.
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The XF-85, a small jet aircraft that was used to explore the practicality of "parasite fighters" that could be carried to defend large bombers such as the B-36. The plane would be dropped from the bomber to fend off enemy fighters then recovered back into the bomber via the large hook on the front. Once mid-air refueling became possible, the "parasite fighter" idea was scrapped.
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Lockheed YF-12. The well-known SR-71 was developed from this aircraft, originally designed as a Mach 3 interceptor that would be used to protect the continental U.S. from Russian nuclear bombers. As that perceived need diminished in the late 1960's, the interceptor program was cancelled. The derived SR-71 continued to be used as a high-speed, high-altitude reconnaissance aircraft.
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Tacit Blue, a stealth research aircraft that was declassified in 1996. It was used to demonstrate how stealth aircraft could be used in air-ground battles and, apparently, how things shaped like bricks could actually be made to fly in a controlled fashion.
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VZ-9 Avrocar.
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Back of the YF-23, which lost the design competition to what is now the F-22. To the right is the X-36, a small aircraft used to experiment with tailless flight.
Mike Morgan
8/6/2016 11:08:47 pm

Can you tell us anything about the 2 small aircraft in the lower right of the picture? They look "cute"????

Andy White
8/7/2016 04:24:13 am

Those are the X-24A and X-24B. They were 1960's-1970's piloted "lifting body" aircraft that were built to experiment with maneuvering wingless aircraft. That research was used in designing the Space Shuttle.

I'm going to add some more photos to the post.

Denise
8/15/2016 11:28:40 am

Hey,

After the War my Father In Law worked on the Valkyrie XB-70. It was compartmentalized that he never knew it even flew until my husband and I gave him some DVDS for Christmas. The fun part is when on the initial landing, the landing caught on fire. Papa Spear actually worked on the landing gear.....he claims he wasn't at work that day. he he. Beautiful plane.

Denise
8/15/2016 11:30:35 am

At least the XB-70 sort of had a secondary life as being the basis of the Concord, which of course is also sadly gone.


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