Key Points and Summary on SR-72 – The SR-72 “Darkstar,” the hypersonic successor to the SR-71 Blackbird, is being envisioned not just as a spy plane but also as a bomber, a role its famous predecessor never fulfilled.
-While the SR-71 was never weaponized due to the physics of firing projectiles at Mach 3+, the unmanned SR-72 might be designed to launch its own hypersonic weapons.
SR-71 Blackbird. Image Credit: Creative Commons.
-However, its extreme speed, while a massive advantage for survivability, could limit its loiter time over a target area, a key consideration for a strike platform.
-The debate continues over whether the “Son of Blackbird” can be a truly effective bomber.
SR-72 As a Bomber or Strike Aircraft — Does This Make Sense?
In the 2022 cinematic summer blockbuster “Top Gun 2: Maverick,” the SR-72 is nicknamed “Darkstar.”
In real life, the SR-72 program, as can be surmised from its cleverly combined alphanumeric designation and unofficial nickname of “SOB” as in “Son of Blackbird,” is seen as Lockheed Martin’s) legendary “Skunk Works” division’s direct successor to the iconic SR-71 Blackbird, which, 27 years after its retirement, still holds the world record as the fastest air-breathing aircraft ever built—officially Mach 3.2 but unofficially at or above Mach 3.5.
As truly impressive as the Blackbird’s speed capabilities were, the Son of Blackbird would presumably leave its “parent” plane (as it were) in the dust, to the tune of Mach 6, giving the proverbial “new kid on the block” true hypersonic capabilities.
And although, just like its legendary ancestor, the SOB is still envisioned first and foremost as an intelligence, surveillance, and reconnaissance (ISR) platform, it’s also reportedly being considered for missions for which the SR-71 was never used: as a bomber or a strike aircraft.
But would these sorts of missions be feasible?
Historical Precedents: The Would-be Blackbird Bomber
Believe it or not, the SR-71 was also briefly considered for bombing missions back in the day. Indeed, in the early stages of the Blackbird’s development, there was one prototype variant known as the YF-12, which was designed to carry 250-kiloton nuclear warheads. Designers later scrapped this design feature in favor of radar-jamming systems.
As noted by Matthew Ryan in a February 15, 2018, article for World War Wings titled “The Crucial Reason Why The SR-71 Blackbird Was Never Weaponized,” “But the reason that the Blackbird was never weaponized boils down to the physics of the aircraft … [The SR-71] is faster than a speeding bullet and that is how the problems develop. If the SR-71 were to fire off a shot while in flight, it would likely crash into the projectiles it fired off causing damaging itself. Since the Blackbird was utilized for speed and reconnaissance the addition of weaponry would only add extra weight and increase drag.”
SR-71 Blackbird. Image Credit: Creative Commons.
In turn, this meant reduced fuel capacity, requiring more in-air refueling, and additional operational costs.
Moreover, precision-guided munitions (PGMs) weren’t an option when the Blackbird first flew in 1964; therefore, that would have led to concerns about the accuracy of bombing from the plane’s operating altitude of 85,000 feet.
It wasn’t until October 1986 that the US Air Force finally had its first operational supersonic strategic bomber, the Rockwell B-1B Lancer (aka the “Bone”).
How the SR-72 Could be Weaponized
According to Christopher McFadden of Interesting Engineering in an article titled “SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025,” unlike the filmic version of the Darkstar, the real SR-72 is going to be unmanned, at least according to some reports.
This will undoubtedly be disappointing news to test pilots who aspire to become a real-life Maverick, but it also means fewer pilots’ lives being placed at risk.
Moreover, SR-72 could support Lockheed Martin’s new High-Speed Strike Weapon (HSSW), which can fire hypersonic weapons faster than any other system and instantly achieve hypersonic speeds; for good measure, it can maintain these speeds for longer periods. Presumably, at least in theory, the SR-72 could fire the HSSW at an angle that avoids the risk of the warbird running into (and afoul of) its own ordnance.
Ergo, if the SR-72 and the HSSW were to become a viable tandem, that would be an ideal tag team for striking targets in hotly contested battle spaces where manned aircraft would be too slow and too risky.
But again, no one is really for sure if this is possible.
SR-72 In 4 Words: Bomber Might Not Happen
However, if this SR-72 Darkstar bomber concept were to happen, there would still be some technical considerations and concerns.
First and foremost is the loitering capability. Yes, that Mach 6 speed would enable the SOB to enter and exit the battlespace in record time.
The problem is, if that warplane were to need to make a second or even a third pass against the target, that super speed would result in a longer distance required for the plane to turn back around for those follow-up attacks, and that means a lot of fuel consumed in the process and therefore less Time Over Target (TOT).
This can be seen in two merely supersonic (as opposed to hypersonic) 4th Generation fighter-bombers that the US Air Force can and does use for ground-attack missions: the Lockheed Martin F-16 Fighting Falcon and the Boeing F-15E Strike Eagle (we could also include its newly fielded successor, the F-15EX Eagle II). These planes are superbly accurate in delivering air-to-ground ordnance, but at speeds of roughly Mach 2.0 and 2.5, respectively, they’re gas guzzlers.
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Contrast this with the “low-and-slow” Fairchild Republic A-10 Warthog. Though its airspeed maxes out at a mere Mach 0.59, its fuel consumption rate enables it to loiter longer and make multiple attack runs before finally going “Bingo Fuel” and needing to return to base (RTB).
This helps explain why Congress is so reluctant to see the Warthog retired, even though the USAF has already started the A-10’s retirement party.
Whether the 6th Generation SR-72’s turbine-based combined cycle (TBCC) hypersonic propulsion system will offer an improvement in fuel efficiency over the 4th Generation engines remains to be seen.
About the Author: Christian D. Orr, Defense Expert
Christian D. Orr is a Senior Defense Editor. He is a former Air Force Security Forces officer, Federal law enforcement officer, and private military contractor (with assignments worked in Iraq, the United Arab Emirates, Kosovo, Japan, Germany, and the Pentagon). Chris holds a B.A. in International Relations from the University of Southern California (USC) and an M.A. in Intelligence Studies (concentration in Terrorism Studies) from American Military University (AMU).
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Zhduny
July 11, 2025 at 12:24 pm
Monsieur Orr, SR-72 today now is great-legends legendary vaporware.
The boffins at livckmart boeing and darpa have nevner been able to get past the materials problems confronting sustained high-speedy speed flight that have been blocking them all this very long long while.
Thus SR-72 today still being a load of hot air. Also explains why US intelligence agencies have been attempting to hack into north western polytechnical university for ages and ages now.
Northwestern, or NPU, is the premier high-speedy speed flight institution in china.
It has succeeded in achieving sustained mach 12 flight using air-breathing machine.
The US today can’t hokd a csndle to What the chines have been achieving since roughly abour a decade ago.
Since the time of the very beginning of wu-14 test flights or flight tests.