Key Points – The A-12 Oxcart, developed by Lockheed’s Skunk Works for the CIA in the early 1960s, was the single-seat, Mach 3.29 (at 90,000 feet) precursor to the USAF’s more famous SR-71 Blackbird.
-While both were designed for high-speed, high-altitude reconnaissance, the A-12 was faster and flew higher, focusing primarily on photographic intelligence.
-The SR-71, a larger, two-seat aircraft, carried a more diverse sensor suite (including side-looking radar and ELINT), had a slightly longer range, and was built in greater numbers.
-The A-12 program, America’s first operational stealth-influenced aircraft, ended in 1968, partly due to cost and inter-service priorities.
A-12 vs. SR-71
The United States developed spy planes that were difference-makers during the Cold War. The U-2 spy plane flew for several years, but by 1958, the CIA decided the famous aircraft needed replacing as it was becoming vulnerable to Soviet SAM (surface-to-air missile) defenses. Discussion on this matter began two years before Francis Gary Powers was shot down over the Soviet Union.
The agency contracted Kelly Johnson of the Lockheed Skunk Works aircraft fame to build a spy plane capable of traveling at Mach 3 (2301 mph). The program operated under the codename ARCHANGEL. Johnson had developed the U-2 for the CIA after just nine months of receiving the contract.
Johnson’s team produced the A-12 in 1962. On April 26, 1962, the first A-12 lifted off from Groom Lake, Nevada, where the agency kept its U-2s.
Meet The A-12 Oxcart
It was a marvel of engineering then and now. Nicknamed the Oxcart, which was distinctly uncharacteristic of the speed at which the A-12 traveled. Lockheed unofficially dubbed them “Cygnus,” named after the constellation of Cygnus, the swan.
To meet these challenging requirements, the Skunk Works engineers developed cutting-edge innovations in titanium fabrication, lubricants, jet engines, fuel, navigation, flight control, electronic countermeasures, radar stealthiness, and pilot life-support systems.
The Oxcart was America’s first stealth plane, though it was never completely stealthy. The amount of fuel it had to carry to fly so fast for so long required changes in the airframe design that made it easier to track on radar. The innovative design and technologies developed for the A-12 were used for years after and helped lay the foundation for future stealth research.
In 1965, the A-12 was declared fully operational. It attained a sustained speed of Mach 3.2 (just over 2,200 miles per hour) at 90,000 feet altitude—an unbroken record for piloted jet aircraft.
The program ended in 1968, in part because the Air Force wanted control over all Mach 3 aircraft and didn’t want the CIA involved in what they perceived as their mission. The costs associated with operating the fleet of 15 A-12s and the new SR-71 were cost-prohibitive.
The SR-71 Blackbird
Just a few months after the first flight of the A-12, in December 1962, the Air Force ordered six “reconnaissance/strike” or SR aircraft for high-speed, high-altitude flights over hostile territory: the SR-71 Blackbird.
The SR-71 was nicknamed the “Blackbird” because of the special black paint that covered the aircraft. Although the Blackbird’s stealthiness resulted from radar-absorbent structures along the chines, wing edges, vertical tails, and inlet spikes, the paint helped to release some of the heat generated by air friction and to camouflage the aircraft against the dark sky at high altitudes.
The Blackbird was also a product of Kelly Johnson’s Skunk Works. It, of course, achieved fame for overflying the Soviet Union for years without ever being shot down. The Soviets fired more than 4,000 missiles at it and never hit it.
What Are The Differences Between The A-12 and SR-71?
The primary differences between the A-12 and SR-71 involve the crew size, sensor payload, and overall size.
According to CIA records, the A-12 was a single-seat aircraft, while the SR-71 was a two-seat aircraft. The SR-71 also carried more sophisticated sensor systems, was heavier, and was slightly longer. While the A-12 was faster and could reach higher altitudes, the SR-71 was designed for more diverse reconnaissance missions. Here is the breakdown of each aircraft.
A-12 (OXCART/Archangel)
Crew: Single pilot.
Sensor Payload: Primarily focused on high-resolution photography for overflight reconnaissance.
Speed and Altitude: Faster and could reach higher altitudes than the SR-71, with a documented speed of Mach 3.29 (2,208 mph) and 90,000 feet altitude.
Size: Smaller and lighter than the SR-71.
Role: Primarily designed for overflight intelligence gathering with cameras.
The A-12 had a more streamlined, less bulky design compared to the SR-71.
SR-71 (Blackbird)
Crew: Two-seat cockpit with a pilot and a radar systems officer.
Sensor Payload: Carried a wider range of sensors, including side-looking radar, cameras, and ELINT (electronic intelligence) systems.
Speed and Altitude: Slightly slower, flew at a lower altitude than the A-12 but later achieved a top speed of Mach 3.32 (2,547 mph) and a service ceiling of 85,000 feet.
Size: Larger and heavier than the A-12.
Role: Designed for more diverse reconnaissance missions, including side-looking radar missions and gathering intelligence without needing to penetrate enemy airspace. The SR-71 also had a more extended range, 3,250 miles to the A-12’s 3,000-mile range before it would require aerial refueling.
About the Author:
Steve Balestrieri is a National Security Columnist. He served as a US Army Special Forces NCO and Warrant Officer. In addition to writing on defense, he covers the NFL for PatsFans.com and is a member of the Pro Football Writers of America (PFWA). His work was regularly featured in many military publications.
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