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SR-72 ‘Son of Blackbird’: The Mach 6 Spy Plane Finally Revealed?

Image: Creative Commons.

The SR-72—also known as the “Son of Blackbird”—is a potential hypersonic unmanned aerial vehicle (UAV) concept that is currently being developed under Lockheed Martin’s Skunk Works or Advanced Development Programs. It is the highly anticipated successor to the aerospace company’s much-vaunted SR-71 Blackbird, which retired from U.S. Air Force service back in 1999.

Lockheed Martin initially confirmed that it was working on the next-generation aircraft more than eight years ago, but there have been very few updates since.

However, according to, “the Air Force and Space Force have sent a not-so-subtle YouTube message (see video above) to countries messing with the U.S.’s various global sandboxes that includes what appears to be a sneak peak of a drone dubbed Son of Blackbird.”

SR-72: A Real Sighting?

At the conclusion of the roughly three-minute video, “the slickly produced video cuts to dark image of a sleek and stealthy-looking aircraft in a hangar that meets the USAF geek description of the SR-72 Mach 6 snooping platform. The military forums lit up with speculation that the video preceded official confirmation of the super-secret program’s existence.”

The SR-72 is being designed to fly for several minutes at a speed of Mach 6—which is more than four thousand six hundred miles per hour. To achieve this, Skunk Works is believed to be collaborating with Aerojet Rocketdyne on a unique propulsion system that will help enable the aircraft to reach such mind-bending speeds.

“Lockheed Martin’s Skunk Works department has been making noises about a revival of the legendary (SR-71) bomber, a jet that was capable of flying up to Mach 3. That’s slightly more than three thousand seven hundred mph, about one and a half times speedier than the .220 Swift, reportedly the fastest bullet ever produced,” Gene Kosowan of writes.

“But the Skunk Work’s brain trust claims the SR-72 might even double the speed of its predecessor. That’s a tricky proposition considering the plane’s air intake would be brutal at those speeds, like trying to start a campfire in gale-force winds,” he adds.

Need for Speed

If such speeds can be reached, the SR-72 would surely give the United States a sizeable advantage over enemy forces. The aircraft could theoretically depart from a base located in the continental United States to hit specific targets across the Pacific or Atlantic Oceans in only about ninety minutes. Defense writer Dario Leone at Aviation Geek Club notes that “intelligence can be gathered or weapons delivered before enemy air defenses are even alerted.”

SR-72 Screenshot

Possible Image of SR-72. Image Credit: YouTube Screenshot.

Do take note that there’s already been talk of the SR-72 eventually being able to achieve Mach 7. Citing author James C. Goodall’s book 75 Years of the Lockheed Martin Skunk Works, Leone writes that “NASA is funding the validation of a previous Lockheed study that found that speeds up to Mach 7 could be achieved with a dual-mode engine that combines turbine and ramjet technologies.”

Ethen Kim Lieser is a Washington state-based Science and Tech Editor who has held posts at Google, The Korea Herald, Lincoln Journal Star, AsianWeek, and Arirang TV. Follow or contact him on LinkedIn.

Written By

Ethen Kim Lieser is a Washington state-based Science and Tech Editor who has held posts at Google, The Korea Herald, Lincoln Journal Star, AsianWeek, and Arirang TV.



  1. Ahmad Dan-Hamidu

    November 23, 2021 at 2:58 am

    In paragraph six of this article, you wrongly described the SR-71 as a “bomber” aircraft. It’s a “reconnaissance” (spy) aircraft, ya might wanna correct the error.

  2. B Kilmer

    November 23, 2021 at 12:31 pm

    You might also want to check your Mach to MPH conversions. If Mach 6 is “more than four thousand six hundred MPH”, then Mach 3 (1/2 the speed) can’t be “slightly more than three thousand seven hundred MPH”

  3. Red Hill

    November 23, 2021 at 1:05 pm

    That’s right, the SR-71 is a reconnaissance bird and not a bomber.
    Also, the Skunk Works explains that a mistake was made when the paperwork was filed for designation and naming.
    It was mistakenly labeled as the SR-71 instead of RS-71 (for Recon & Surveillance.)

    My concern is about fuel burn rate. The SR-71 has very long engines which are required to ensure that the air is compressed, fueled, ignited and burned within the length of the engine. The fuel they already use has a very high burn rate, but to fly twice as fast would require the engines to be much longer or the burn rate would have to be much faster. Maybe a combination of both?
    The article (para. 5) mentions that it could “…fly for several minutes at a speed of Mach 6.” Maybe it would use Hydrogen Peroxide rockets for a short time like the X-15 which was also built be Lockheed.

    Also, Mach 6 is less than 4,000 mph because the Mach number (the speed of sound) at 85,000 ft is only 660 mph, not 760 mph like at sea level. And they’re not going to fly the plane at sea level. The only time they fly it below 60,000 ft is while taking-off, landing, or refueling.

  4. phil stacy

    November 23, 2021 at 6:59 pm

    Marxist Democrats have a new tool to spy on domestic terrorists. This is an obsolete war toy because the new weapon is migration to conquer. Anyone can cross the erased border and join the looting of a defeated America.

  5. cheddar baggins

    November 23, 2021 at 8:24 pm

    For a while, there was a satellite image on Google Maps near the Sikorsky range in Palm Beach County, FL, near the William P. Gwinn airfield 06-FA. The object looked like a diamond, and seemed to be a mockup for a radar range there to get RCS data. The image is no longer there. Make of it what you will.

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