Finally! US Air Force Declared SR-72 DARKSTAR Is REAL!
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- Опубликовано: 26 сен 2024
- The existence of the mysterious SR-seventy-two has finally been confirmed! This hypersonic spy aircraft, with capabilities that sounds like it stepped out of a science fiction movie scene has created a lot of waves in the aviation world and even more in the hearts of aviation enthusiasts. There are several questions concerning this aircraft that have been shrouded in secrecy for too long. What are the capabilities of this extremely advanced aircraft? Can it, in any way be compared to its predecessor?
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#Hyperspeed
When I was in the Navy in1971 I saw an SR-71 parked on the far end of the tarmac at MCAS Yuma. You couldn't get anywhere near it. In 1994 I saw one at the air museum at Davis Monthan AFB in Tucson. I touched it.
Around 94 i saw one in person at March Air Force Base .... pretty sure we got to check it out hands on...
@@kennethwalton5465 Yup..if these birds were declassified/decommissioned in'94 they must have had a replacement (SR 72?) already flying. ..considering that, I can only imagine what USAF has up their sleeve now..Oh, then there's that USSF thing..boggles the mind..
Saw one in the strangest place possible, on a barge. It was heading up to the Smithsonian from the Cape. There was also an F-4 and I think a Sherman tank
@@napoleoneinstein2487 I lived in Yuma for nearly 40 years less than 3 miles from MCAS Yuma. They have the third longest runway in the country. I know that MCAS YUMA is one of the ditch sites for the Space Shuttle because of the length of the runway there. It doesn’t surprise me that the SR-71 was there in the 70s.
@@napoleoneinstein2487Exactly. I HIGHLY doubt the Pentagon just lost trillions. Outside of the bribes, a lot of it is just on classified equipment.
Which leads to the bigger discussion of whether that should be allowed, while spending enough money to conquer most the planet.
The military will NEVER retire ANY aircraft if they don’t have a BETTER one to replace it.
Mercury Magnetic Propulsion is being developed. The magnetic field generated by the craft makes it impossible to detect on radar. UFO sightings for the last 20 years have been the US Air Force testing the aircraft.
I hope I’m still alive when they actually release it to the public.
There are also Real Genuine UFO's in the air also!
In November 2018, Lockheed Martin said that a prototype of the SR-72 was scheduled to fly by 2025
Yes the proof is the B-52 and the A-10 and probably the C-130 and others that Im unaware of.
@@bjarnejensen4486 If that's what they said then that means they had already been testing it the mid 2000s. LOL.
I heard the Chinese were working on some kind of plasma turbine engine, but the mercury magnetic field propulsion system sounds awesome
By the time civilians know about it, the aircraft has been around for 25 years
I saw a streak fly over LaGuardia Airport 15 years ago, I agree with your statement.
As a retired aerospace & defence professional of over 40 years I agree.
They are just now willing to admit to this one, what other UAP do we have in our arsenal now?
Prototype 1987
Fact yes
What is really amazing is the SR-71 was designed without computers. No CAD programs, not even a hand held calculator, but with Slide Rules. Those guys were the real deal math geniuses, working for NASA, defense contractors, the Manhattan Project, Oak Ridge, etc.
For the longest time they kept the max altitude classified. There were some hints when pilots said they could see the stars while it was daytime below them. So high that during an engine failure the pilot was able to glide halfway across the US.
The same goes for so many of the nuclear reactors that have been powering populations for decades. Where are those abilities now? Cheers.
Great point.
So true!! Real amazing work
Had a older electronics instructor that talked about instructor he had that could smoke them using a slide rule.
They could fly so high they could see the curvature of the earth
If they are talking about it openly that means they already have something faster and better that is top secret.
Your wrong imagination.
Your wrong imagination.
@@silentwatcher1455 mmhmmm so you have family in the military like me? You have family that are part of the Joint Chiefs of Staff like me? You understand how the military operates and they tell you everything right? No dude they will not show or talk about their latest and greatest tech. If they do show you it means its no longer considered top secret and that means something else has taken its place.
@John_Corner222 i totally agree with you. Never reveal something that is not yet challenged.
@@silentwatcher1455 Imagine. The Lockheed Martin F-22 Raptor's development began in the early 1980s when the U.S. Air Force (USAF) started developing requirements for an Advanced Tactical Fighter (ATF). There could be more TOP SECRET projects lined up to be released in the future whenever useful and necessary.
120 years ago we were barely flying and look at where we are now. This is just crazy.
i can only imagine what the next 120 years would look like!
It's even more crazy when you realize that the SR 71 and the moon landing happened in the sixties. We have made a lot less progress since then, comparatively.
@@romeomargot-picquendar1281 I would argue that a ton of progress has been made. It's just buried by black budget programs that don't officially exist.
Yep, we would have been to Saturn already if that wax just had not melted on those wings.
@@a-10warthog55 Not really, we had supersonic planes and went to the moon almost 60 years ago. We've refined a lot since then, but no major breakthroughs, we still use basically the same engine technology as we did back then.
Two things I'd like to add here...1. You as a civilian hear about it, it's obsolete with something you will not hear about for another 25 years. 2. There is a reason we now have Space Force...
The reason we have space force is the same reason we have the tsa and middle management ; to justify spending.
A-ha but you are so privileged that you can divulge that kind of ifno regardless of the fact that it would be a security violation to even mention it.
Can't be a violation if they're admitting it's existence...and as a civilian I believe we're 50yrs plus behind the tech. Lockheed are huge here in New Zealand.
We probably have modern SABRE engines that allow us to simply fly straight into space now
It’s like Jeepers creepers only comes out 20 years
"one of the most strongest metals." That quote brought to you by the department of redundancy department.
Or was it the Redundancy Department of Redundancy?
@@aaronmh78 knowing our government, we have both!
@@MD-gc4xq bingo!!
I doubt that I doubt your statement.
Titanium is not remotely the strongest metal. It is not even close to high-grade steels. Merely Ti has a specific gravity of ~4.5 (varying slightly depending upon the alloy) whereas the often far stronger steels have a specific gravity of ~8.5-9.5. However, Ti can maintain structural integrity to far higher temperatures.
Nothing will ever be sexier than the SR-71.
Opinions are like...LOL JK. Check out The Beech-17 "Staggerwing", & IF she ain't #1, She ain't far from it.
Another reason titanium was used on the SR-71 was its' high melting point.
Strength to weight ratio. Holding titanium fakes your brain out with how light it is
And the cockpit "glass" is clear quartz crystal. Again, glass would melt.
they should just keep the name Darkstar...and if they have admitted having Darkstar...what's in the secret hangers now?
the deathstar
@@KennethCherisol and clones in stormtrooper suits.
Lightbulbs
Mockingbird
Which the left helped since they been in office
@8:23
Yes, Mach 6 is faster than the blackbird. The airframe for the blackbird is rated for Mach 4.4.
I just have a question do you really believe that would ever really print the actual top speed? I’m not saying they didn’t. It doesn’t benefit them to print the actual speed or even let it be known. I did read some stories about some pilots saying there was something else left, but they dare not take it there unless it was an emergency. Not sure what would chase them at the speed they can maintain, but it is a thought. I often think some of the stuff we see in the civilian world is just tests for the military world like every time the shuttle went up. They were just testing materials and the longevity.
With whome are we competing for air superiority at 80,000 ft...?
@@ericstyles3724space debris.
@@ericstyles3724Surveillance dirigibles
As the reveal of the SR-71 taught us, they only unveil the big new thing when it isn't big or new to them.
The SR-71 was revealed before it flew.
We only learn about these planes when they are obsolete. Wonder what is taking its place?
Black triangles-space force
A hypersonic drone. Imagine how fast you could make something go if you don’t have to worry about making the pilot black out.
Being a navy veteran, I can assure you that anything that is considered top secret. Is only on a top secret clearance. 🇨🇻
I was briefly stationed at Creech AFB and we had to clear the flightline at certain hours due to the airforce testing. The only glimpse I saw was a roughly rounded triangle shaped drone about 2/3 the size of an f22. It was taxiing in the hanger, but we never once heard it take off or land and wouldn't show up on IFF systems currently used in active duty aircraft.
SR71 was always my favorite aircraft. I wish the SR72 well. Will be looking forward to seeing it.
In 1990 I was making a delivery at Washington Dulles Airport when I saw an SR-71 make a fly-by the tower before landing. It was being donated to the Steven F. Udvar-Hazy Center - Dulles location) of the Smithsonian Air and Space Museum. Before arrival it had set the coast to coast speed record, having taken off from March AFB in California, then flew out over the Pacific, reaching altitude and speed crossed the West Coast then the East Coast in about 61 minutes.
I lived in Palmdale, CA at that time. I remember seeing the SR-71 doing a few touch and go at AF Plant 42. Coolest thing I ever saw. That day they broke the speed record I was sitting at the table having coffee when there was a huge BANG. That was the plane starting the run from the pacific side. A year later, driving by plant 42 the SR-71 was just parked by the road on the other side of the fence. It's now the Blackbird Park. If you're ever in the area you should plan on going there. There's a SR-71 and an A2 (the CIA version), as well as other related exhibits.
The prototype has already flown twice at the time i write this. The prototype is a 2/3 scale single engine version. SkunkWorks is the production facility at Plant 42 located in Palmdale.
Here is an interesting fact. Both the SR71 and the SR72 are not Black. What color do you think they actually are? I will come back to answer or acknowledge who gets the right answer first.
Enjoy!
Best Regards,
Mike Turber
SIA
We have the best aerospace engineers and scientists in the world.
We have the biggest money printers in the world... Fify
And budget.
Spending more on military than the rest of the world combined might have something to do with it.
@@3ls4g4c10us
And??? If anything it makes what he said that much more concrete.
I don't think so
The fact that it doesn't have missiles and other weapons because it can out run it is such a cool but crazy thing
probably because of the design it has to be 100% aerodynamic, stealthy and light weight which is why it can't accommodate weapons. It's also not what it was designed for. But makes you imagine how scary an aircraft like that as a strategic bomber with a single Hydrogen bomb would be.
Cannot outrun top secret lasers
To be able to take-off and enter space without sitting on top of a Rocket has always been the mindset.
Ever notice how modern design almost resembles Sci fi flicks of the past
Clint Eastwood's Firefox for instance
2007? Mach 6? I heard about that in the late 90's. Look up Aroura.
Titanium wasn’t selected for strength it was used because of the heat generated while flying that fast. Countries really weren’t scared of the SR-71 as it was only utilized for reconnaissance. They were afraid of the YF-12, the fighter/bomber variant for obvious reasons. It would be able to Delia nuclear weapon faster than any other aircraft and not be caught while doing it.
We developed the XB-70, Russians developed the MiG-25 to counter it, we developed the Phoenix to take out the MiG. When the YF-12 was canceled, they switched the Phoenix to the F-14. The idea was to station the YF-12 in Iceland so the attack scenario was about 25 minutes to Moscow.
The name Dark Star came from a military radio transmission received by an amateur radio enthusiast who herd the name Dark Star used after a large sonic boom over the area they lived
Yep, just posted about this but you beat me to the punch 😂
wasn't there another one something like aroura some also to do with a radio enthusiast hearing several sonic booms in a row
@@adambreckenridge3741 Maybe the story about the guy hearing sonic booms and then radio transmissions of some unknown flight controller telling an aircraft with the call sign Gaspipe that it’s however many degrees off in relation to a glide slope trajectory or something?
I may be mixing up two stories though.
@@adambreckenridge3741 Yep. The Aurora was a pulse detonation engine aircraft, it was shown in the tv series "Jag".
It might be that this did not work out, maybe it still exists. Looks like the current hype are those rotational detonation engines which provide continuous supersonic thrust.
@@adambreckenridge3741 flagged
They admitted that a couple months ago. You're late to the games.
Better late than never.
By decades
2:34 The purpose of Titanium had nothing to do with stealth, it had to do with the fact that aluminium would simply melt at the speeds that the SR-71 was designed to operate at. Titanium has a higher melting point, it's that simple.
Agree
I read a book about the development of the 71, after a high altitude, high speed test flight, the vehicle lost brakes upon landing. They were in the desert, so the aircraft wasn't damaged. Inspection found an aluminum plug had melted out of one of the hydraulic components. Kelly Johnson wanted to know how the hell an aluminum part found it way into his plane, lol.
Traylor was right,not only that but knew were it was parked.
Is he posting anymore? Haven’t seen any videos from him in a long time.
Erm... I'm still waiting on further evidence.
You know, ive never actually heard of how "Skunk Works" came to be. I appreciate you including that.
Aurora has been flying since the early 90s , my brother was at edwards back then and it was talked about and distantly seen . Its probably ready to be declassified soon , since theirs probably superior things being piloted or pilotless
The aurora project was the B-2 Spirit. Gotten confirmed by a test pilot of that plane and several others.
@@QuintGeckoA cover story that makes no sense considering the B2 was fully funded and in the white at that point.
I'm betting Aurora was just an earlier prototype of, or proof of concept for Darkstar, same purported engines involved, turbine, ramjet, scramjet, similar general description.
@@arqHHM Yeah. Almost how the “Have Blue” prototype was to the F-117.
I also think the Rockwell X-30 NASP was cover story to divert funding for Aurora way back when.
When the SR71 Blackbird was parked on land it would leak fuel like crazy. But when it was supersonic the metalic materials would heat up and expand and stop leakage. This was a deliberate design aspect to allow for heat expansion. So no smoking
I am so impressed Clarence Kelly Johnson designed that plane completely alone with no help of any kind, what a heroic and truly amazing effort. 1:57
Absolutely! No computer helped him.
He had help from a slide rule.
I was thinking similar😂
Alien anyone??
"Declares the SR-72 is real"
So you're telling me it's already obsolete? 😮💨
SR-71 Developed by Skunkworks
Skunkworks devision is owned by Lockheed Martian
If Lockheed Martin and the Air Force has declared it real, then I posit one of 2 distinct scenarios.
1) It isn't actually real and is being used as a red herring to keep snoops away from what they're actually working on, or
2) It is real, but no plans to actually produce it because they have already something better in the pipeline.
There is absolutely no way the the Air Force would admit to something being real before they have actually put in into service.
MACH 20: Over 15,000 MPH!!! That's fast. I thought my F-16s were fast. MACH 6 is going to kick some tail. I wish I was still in the USAF to see this.
The video says "an altitude of 85,000 feet (16 miles)". You can't kid a kidder. It is capable of FAR better.
To a certain point. You get up that high and there's an entirely different environment to deal with. JP-7 still needs O2 to burn. You'd have to introduce another type of fuel/engine for starters. Plus the atmosphere is so thin, control surfaces on the aircraft would not be able to do their job as well. It's an entirely different animal above that height.
Such aircraft makes it much more important to choose the best national leaders.
I saw it flying through the Michigan upper peninsula in 2019. Was way higher than any Comercial jet and crossed the night in about 10 seconds in and out site.
Ace combat 7 needs to update its stable of aircraft
I never believed the F-35 cost that much. I always thought the only reason to why it was over budget was that much of the funding was being funneled into black projects developed by the U.S. government.
the triangle UFO replaced the blackbird back in the 90s lol
And here I am standing here with my club next to my fire
Laser weapons..??? For causing "wildfires" just like in Maui ..??? Sweet!
pass the pipe
@@vaporiiz no pipe here; only eyes and a brain.. you should try it some time.
We had a black v shaped plane fly by us when we were camping out in the Steen mountains in Oregon. It was so fast that we almost missed being able to see it. It crossed the valley we were camped in just a few seconds. Sounded odd too.
I remember when I was in the Air Force in 1971 and in the George AFB control tower seeing the SR-71 brought out of retirement and flying in the pattern. It was later revealed or rumored that it was involved in secret operations in the ranges in the Edwards Air Force Base area. The SR-72 may be the result of that testing.
"Top Run, Maderick" ! Copyright issues?
No Lockheed Martin designed the one in the movie, it was kinda like a early teaser for the Blackburn
@@Ch1ckeNug01 This. They were working together. The Lockheed logos are in the movie.
@@ILruffian yes I’m aware, just saying that there won’t be any copyright issues because Lockheed designed the craft.
@@Ch1ckeNug01 No doubt, we are in total agreement. The two companies were cooperating.
Ramjet? You mean scramjet!
Need both I suspect.
Roger.
@@Z4Zander Roger Ramjet
What human on earth would even be qualified to drive that thing?!
this thing fly's not drive. It's an aircraft
I’ve heard on TV that some of these really fast aircraft are going to be drones that are basically the size of modern fighter jets.
it had better be our guys !
I believe it’s being touted as “Optionally Manned” so it may very well be a drone.
@@generalrodcocker1018 Drive! Ask a pilot.
that voice sounds so real until he hit the two ninety two million dollars.. 🤨
Is that the laser that they use to wipe out Maui in Hawaii seems like nobody talks about that anymore
My thought as well
Ditto
Facts great comment the very first comment I actually clicked the 👍
Numerous inaccuracies
I guess it was 40 years ago or more, when I worked on some of the prototype engine parts for the SR 71… And I actually got to walk up and look at one in a hanger in a secret place. It was pure cool.
Not laser weapons, directed energy weapons. They've worked well since 2001.
A laser IS directed energy. Duh.
@@svennoren9047 Directed Energy Weapons (DEWs) are in use. Laser weapons are a subset of directed energy weapons. Various types are at different stages of deployment around the world. Microwave Weapons that caused victims extreme pain, (skin burning, blood boiling) were used on 9/11 forcing 1,200 of them to jump to their deaths.
@@stealthhumor Do you have _any_ evidence to back up that claim?
When I was in the military, we were working on radar and running scenarios for the patriot missile system in White Sands we could only do it at certain times of the night because the radar was so powerful that it affected the local airport quite some distance away. There was something going on because we got glimpses of very high speed aircraft speeds that should not be possible. I still wonder what that was. It wasn’t an anomaly. It was caught on radar but vanished so fast that we always wrote it off as a missile or something some sort of test but now looking back on it I think it was something different. The radar cross-section was larger than a missile, but moving way too fast for a plane at least that’s what we thought. The timeline would be probably early testing. This was before the revealing of the stealth fighter to the general public when we first invaded Iraq. So many weird things.
That’s interesting, because I thought the disk-shaped craft is the best 😉
it's secret for a reason.
When will they admit that the UFO Tick-Tack is theirs too?
Maybe if they ever get their hands on one!
@@ericanderson3453 Talk to Bob lazar.
It was not ever actually a thing.
It was an artifact produced on sensor spoofing technology from projects developed by DARPA, the project was called Nemesis if I recall correctly.
@@rifleshooterchannel208 pretty sure it was eye-balled by at least two pilots, Col Fraver (might be spelt wrong) and his wingman/woman.
@@67geetar I really doubt they saw something that was allegedly moving Mach 4.5
I was surprised to hear of a carbon composite that can take more heat than titanium. There's currently no commercial carbon composite that is this heat resilient, so it's more likely to be a modified carbon composite with some form of ceramic matrix or similar, but it's heavier. This has always been the glass ceiling for hypersonic flight, which is why the SR71 leaked fuel on the apron before takeoff
Nice model🥶🥶🥶
So magical. We will only be able to afford 5 in production if we are lucky
Here's your UFO people !!
Cute.
Talk to me about SR-91 Aurora or TR-3B Ad-Astra and then I'll be impressed.
This is so much more badass then being able to afford the knee replacement I need. Yes, and I have "good insurance"
It's not Lockheed that made it, but Skunkworks.
While part of Lockheed Martin, it's still a unit on it's own.
Intresting...2 × 3200 pounds of thrust to propel a small jet plane to mach 6... cool 😎
They keep talking about it as a fighter, but it would be suicide to try to deploy munitions at M6.
Laser, he said.
@@captmack007 SR = spy/recon, F = fighter, B = bomber. If in fact it does have a laser, it's not for use a weapon. Maybe LIDAR.
Vertical stabilizers aren't needed since 1945 when the Horten Ho 229 was the first jet powered flying wing.
Computer systems just massively helped flying these wings.
If they have a similar aircraft and im sure they do it will not need a pilot any longer.
Real and extremely awesome!
@6:00
You didn't mention that sunk works was a cartoon. The cartoon company didn't want them using their name. So they changed it to Skunk works.
In Dayton Ohio they have at least Four, Yes Four Sr71 's. They keep at least operational . I got to touch one of them !
Before civilians find out, then the bird is about to go on retirement
Worked at a Lockheed division in California during late '80's/1990. Got the SR71 T shirt from the company store.
They should've kept it a secret
I knew we have UFO technology in the military and hope they don't say everything this plane can do and our military is going to be the strongest ever ! USA 🇺🇲🇺🇲
Hopefully the PLA generals and Xi lose their arrogance and consider this broadcast truthful. Hope this revelation promotes peace. US technology is for peace; Chinese technology is for coercion and aggression.
@@1Dising2u That's an interesting observation. Over the past 70 years, how many wars around the world has US instigated? And how many wars has China fought?
Which brings up another interesting fact. How much weaponry has US sold over the last 50 years? And who does these weapon sales profits go to?
@@1Dising2uPeace? Bless your heart. It's for protecting interests. Research how many coups the US was responsible for/directly involved in.
This isn't opinion or conjecture. It's pure facts. There are more that haven't been declassified.
Don't think i didn't notice the AC7 footage. I fly it in red too.
The fastest plane in existence currently is made and kept secret by the Cameroon airsquad.
It was able to reach mach 16
This and the TR3B are some true game changers‼️
The SR71 is hilarious. Leaks fuel and has to be refueled once it's in the air. On the other hand, it is still unmatched in some areas. What a marvelous machine. It would appear that the 72 will be superior as well and of course not leak fuel.
The leaking fuel thing bewilders me so much. They really weren’t able to create a solution for that? XD Eh, what do I know. What an insane aircraft…
@@malokeytheallaround I saw a video that went into some details on the tech of the SR71, but I don't remember the details on why the leaking. If I was to guess, I would say they didn't have the time or budget to solve it.
@inforobob so apparently the reason it does that is because at cruising speed, the titanium plates expand from the heat and thus fills in the gaps. When it’s grounded, it shrinks and produces the leaks.
It baffles me because that’s a lot of expensive, special fuel just pouring on the tarmac. I wouldn’t think that to be more cost effective than spending a little more time and money for a workaround. But hey, it doesn’t matter anymore, the Birdie is retired now.
@@malokeytheallaround Thanks, I thought it was heat related, but could not remember the particulars. I'm skeptical it's really retired. One must be careful believing anything a government tells one.
Wait till DEI gets ahold of this. 😂
A plane that outruns rockets 🚀 is major insanity lol
Well, that claim of outrunning rockets is sorta baseless in that if you can build a plane to run at certian speeds, why can't you build a rocket to run at certian speeds? Tongue in cheek at best.
@@bashinnc agreed!
Inconel and Ti are my favourite metals, CF is my favourite composite.
"90 minutes from New York to Paris..." Hey wasn't that some lyrics from a hit song several years ago?
Grew up with the Blackbird, was my first model and choice 2nd only to the F14 in my book. #22
China has just announced that they have flying people. Oh, wait, yhey already have those in martial arts movies.
Were shown a lot of stuff through movies and TV. It just gets brushed off as "ohhh, it's just a movie. It's not real."
The SR-73 must be operational now.
As of May 2024, the US Air Force, nor Lockheed Martin, have officially confirmed Lockheed Martin is developing the SR-72. They haven’t denied it, but they certainly haven’t confirmed it. At best, this video is wishful thinking.
It's legit. The Blackbird has been around it awhile.
You should see what they are working on now. Research another old school Russian nuclear sub with the Poseidon nuclear torpedo
They may not have confirmed it, but if you watch skunkworks video about the Darkstar and top gun 2, they cover the inlet and outlet for both engines. This is usually only done to avoid a professional engineer with keen eyes to guess about the engines and try and compete. Even though it's maintained through said video that it is not an actual viable aircraft, it's odd that they would cover the inlets and outlets if there is no flight capability.
The worlds first and only 7th generation aircraft.
if we can get a bunch of em in the next 5 years we're gonna need em
Fire backwards like Firefox movie Clint Eastwood.
Good stuff to see🎉😊
(0:15~) "...with capabilities that SOUND..."
What does the "Top Run Maderick" logo mean @ 5:20? Is there a back story here?
Thank you. In order to stay free we have to be the strongest.
MKBHD: So I've been using the Darkstar daily for the past 6 months...
Where does the A-12 fit into this picture?
EVERYWHERE. The only answer is more A-10, and an A-12 seems like it should be more than an A-10.
@@TheTerryscotttaylor A-12 was a variant of sr-71. Had a table full of lifers, sitting at a table at a family gathering that said he was flying A-12s and as I walked past they immediately hushed
That was in the 80s
There’s probably another 10 years before I found out What an A-12 actually was
Things not mentioned were how much fuel the SR71 uses. It also has to take off with 1/4 full tanks because of weight then immediately be fueled. Then it needs to land only large runways with low filled tanks. Even with it's large size for holding fuel it has a very limited time in-air before needing refueling and maintenance. Thus even if an SR72 was developed that did not fly much faster but was more fuel efficient, it would be a useful leap forward.
the only aircraft made with a ram jet over a turbine engine . this is the reason it can fly so fast and so high.
the Ram jet part of the engine has no moving parts . it only works at very high speeds