How long did it travel at hypersonic speeds while operating it's air breathing engine? I'm going to guess it was shorter than the thermal soak time of whatever material they were using for the inlet. The non-simple conical form of a scramjet means shockwave impingment has to happen in there somewhere and you can bet there's no material on Earth that's going to last more than a couple minutes.
Hypersonic air-breathing craft that generate lift just aren't a reasonable thing to make. Hypersonic "gliders" and other rocket lofted things that get up to speed outside of the atmosphere and then just briefly travel through it make sense. But all this 'research' towards lift generating air-breathing hypersonics is just a trap to get nation states to dump money and effort.
The USA invested a lot in them in the 1960s/70s. That research pretty much conclusively found lift-generating thrust-producing in-atmosphere hypersonic craft weren't feasible. So the US let it drop.
Fast forwards 50 years and other nation states are looking for ways to achieve ICBM-like performance without being mistaken for an ICBM. They foolishly fund these projects and then have to save face. The "hypersonics" are lauded as impressive "new" weapons for propaganda.
The US, seeing this propaganda, has researchers that realize they too could use the funding again even if the end goal is silly. They could get in on the propaganda too. I assume the decision makers re: funding just don't understand the physics.
The world's militaries want a *homing* hypersonic missile, to avoid AEGIS missile defense and attack a US Carrier moving at 35MPH, trying to actively dodge out of the way.
That means steering and thrust on the way down, likely staying at hypersonic speeds until it impacts the moving target.
The world's militaries are trying to kill the US Carrier Strike Force.
There's no need for air breathing, or other, thrust for this. Maneuverable reentry vehicles have existed for quite a while. We can call them hypersonics for nationalistic reasons but the speed is only achieved after the atmosphere and very briefly in it going down.
If the goal is to avoid looking like an ICBM trajectory to avoid the other nation states thinking it's a nuclear attack then it makes sense. But it's still not achieveable for long periods of flight so the ICBM is required regardless.
> "[Hypersonic] Maneuverable reentry vehicles have existed for quite a while"
I keep reading this comment on HN. It's like saying "What's the deal with Chuck Yaeger breaking the sound barrier, we've had supersonic bullets that do that for a long time". There is zero overlap between the two.
Maneuverable reentry vehicles can wobble around a bit while falling, whereas the point of hypersonic weapons is maneuverability for a significant part of the trajectory.
Not just maneuvearable, but actively maneuverable, aka able to sense some type of input inside the cone of visibly superheated air around it. This is different than an ICBM RV drifting around with RCS before re-entry or a cruise missile idling about before it's accelerated to attack speed.
Unrelated but that's also why any talk of stealth with hypersonic is stupid; everything around the projectile is going to give off more of a signature than the projectile itself
> Not just maneuvearable, but actively maneuverable, aka able to sense some type of input inside the cone of visibly superheated air around it.
For ICBMs these are called MARV warheads and they were first demonstrated in the early 1980s, and every major power has had them, though many don't have any operational now.
> avoid AEGIS missile defense and attack a US Carrier moving at 35MPH
They want a propaganda tool. As the other comment mentions, manoeuvrability is cheap. And projectile defenses’ vulnerability to swarming is well know.
But launching tens of thousands of explosive-laden drones sounds low tech, so we get Xi and Putin touting hypersonics and our military-industrial complex smelling money in the counter.
You do not need to manuver to hit a carrier? 35mph is "slow" relative to a missle, and a carrier takes literally minutes to speed up / slow down / turn. You can math out and shoot a literal cannonball and hit a moving 35MPH carrier within a few inches...
First, you need accurate, current location info on the carrier. That's not easy.
Second, you need something that can launch your cannonball. That's not easy, either, because if you're within cannonball range of a carrier, then you are within range of an enormous amount of return fire from the carrier strike group, and you're dead long before you get a chance to fire your cannonball.
The problem is getting current targeting information to a launcher that's 1000 miles away from the carrier, and then the carrier still moves enough to really matter during the time that your missile travels that 1000 miles.
Where does that "swarm“ of drones come from? Any drones cheap enough to use in a swarm have very limited endurance and weak sensors. Possibly useful in the littorals, but a total joke for blue water operations.
Satellites are limited and impossible to hide. The carrier strike force knows exactly when they are in view of an adversary's reconnaissance satellite. In any future major conflict the satellites will be the first casualties. There is a very active arms race in anti-satellite weapons.
That swarm of drones will almost certainly be spotted by the AEGIS air defense network (the cruisers and destroyers that escort the carrier), and shot down. Cruisers and Destroyers serve as the "screening" role for the Carrier, you will always see the cruiser/destroyers first in the Carrier Strike Group no matter what angle you approach from (and vice versa, they will see you first before you get to the Carrier).
This gives the cruisers/destroyers a chance to shoot down the drone swarm (or whatever air platform you're using). If its too much for the sea-based air defense systems to handle, they'll radio for assistance from the Carrier and F18 / F35 jets will be dispatched, beyond the horizon, before the swarm even sees the Carrier or pinpoints its location.
That's the difficulty of fighting a Carrier. Not the Carrier itself per se, but the entire team that works together. AEGIS cruisers have the best radar systems the US Navy can offer, and their large power plants can make their RADAR systems more sensitive / higher power than anything you can possibly hope to put into a drone.
That's not how it works. The launching platform will never have a sufficiently precise target track to hit a carrier with an unguided weapon from any significant distance. Flight time will be at least several minutes so even a slight course deviation is enough to generate a miss. The new generation of hypersonic missiles will have some onboard sensors and ability to seek out a target, but only within narrow limits.
The US Aircraft carriers are powered by two nuclear powerplants, with massive rudders/turbines that can propel, accelerate, and move the craft at surprising speeds.
In fact, one of the problems of the US Supercarriers is that at these high speeds / acceleration, an unprepared sailor can fall off the ship. Its legitimately one of the most common ways to die on a US Supercarrier.
Your only comment about heat load is that it's the most important factor and then I should look at some picture. There's zero reasoning in that picture.
After release from an aircraft, the first stage boosted the vehicle to the expected scramjet ignition envelope. From there the missile’s Northrop Grumman scramjet engine fired up and propelled the cruiser to speeds greater than Mach 5 (five times the speed of sound) for more than 300 nautical miles and reaching altitudes higher than 60,000 feet.
The British are still investing in development of the Reaction Engines SABRE air-breathing hypersonic engine concept. They have a novel design to address engine cooling but it's unclear whether it will really work.
Meanwhile Russia is successfully fielding hypersonic weapons in it's invasion of Ukraine. Additionally, US air defense tech is severely lacking compared to Russia's multilayered systems. Yet US spends much much more. Where is the money going?
How many HIMARS rockets are the Russian defense system shooting down?
Given all the ammo dumps on fire this past week, it is clear that the Russian air defense system fails at subsonic rockets, let alone supersonic or hypersonic.
We'll seriously discuss air defense the moment Russia can deal with cheap rockets / Missiles (HIMARS or Neptune).
But Moskova sank and now S300 /S400 systems are getting wrecked. The Russian systems have proven to be a complete joke to a degree no one expected.
Against the Russian adversary, it has become clear that hypersonics are not needed. Neptune (subsonic sea skimming cruise missiles) and HIMARS (ballistic semi-guided subsonic rockets) are all that's actually required.
Even Israel, with limited territory that it wants to protect isn't successful in 100% of times. Currently air defense of all military powerful countries is able to defend against limited attack of ballistic missiles, not against every single rocket that MRLS spews in a span of 20 seconds.
btw Iran rocked US bases in Iraq just fine with not terribly modern rockets.
12 missiles, zero deaths, some concussions, advance warning to the Iraqis, and targeting a lightly-defended base; "due to the lack of a missile defense system at the bases, no missiles were intercepted".
Wouldn't read too much into it. It was a tit-for-tat response to the US droning an Iranian commander.
Which is why I'm arguing in favor of missile swarms, rather than hypersonic missiles. A missile swarm will accomplish the same thing as hypersonic, in that it will overwhelm the enemy's air defenses and allow you to prioritize specific targets with high chance of success.
HIMARS rockets, launched 6 at a time (or at least, 6 in a minute), seem impossible for the Russian army to stop. They may have some systems shooting down some of these missiles, but the Ukrainians are clearly hitting a lot of important targets with just 4 HIMARS systems.
Just saturating with 6+-HIMARS coordinating and massing fire would probably be cheaper than deploying hypersonic missiles (!!!). Don't get me wrong, HIMARS are expensive... but hypersonics are __REALLY__ expensive.
Future "Swarms" of missiles can enable missile-to-missile communications (who is still alive? Anyone sensing enemy RADAR signatures that we need to dodge? Etc. etc.) to improve overall missile performance.
S300/400 works just fine against aircraft and probably cruise missiles.
HIMARS rockets are small, fast ... S300 was supposed to stop them, but we can't be sure how many are getting hit even then I don't think we can accept to get a volley of 6 rockets interceded.
That said, of course Russia's used of supposed 'hypersonics' is a pointless distraction.
There isn't an obvious gap anywhere here, other than it seems PAC/Patriot systems are so expensive there are few deployed, which is a bit scary.
Also, no matter how good your AA, where there is a ton of missiles and jets, some things get through.
> You don't get a swarm just because you deploy multiple missiles at the same time.
A missile swarm knows that Missile #5, and #10 were shot down, and that missile #5's target was more important than Missile #1's target. A "saturation attack" won't have this effect.
Simple intelligence, not even "AI level", but some basic communications between missiles, can lead to better mission success.
A "saturation attack" means hitting an area with maybe 30 missiles and hoping all the targets get blown up. A missile swarm on the other hand, has those 30 missiles communicate, prioritizes, and focuses upon target locations as they get intercepted, all automatically. If 25 missiles get shot down, the remaining 5 missiles still hit the top 5 most important targets. If 15 missiles get shot down, the 15 missiles spread out and hit lower priority targets (rather than redundantly making the craters bigger).
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A "Swarm" is just an incremental upgrade to the already well performing "saturation attack" strategy. But we have enough communication systems that coordination and prioritization should be in our next-generation missile systems.
This isn't a revolution, its just a natural evolution to the age-old saturation strategy. Put simple dumb computers to make the strategy even better in the future.
For gosh sakes 'swarm' / 'saturation' practically the same thing.
And yes, there's no point in 'hypersonic missile' obviously if you can just shoot $100K rockets, but the hypersonic cruise missiles have a much bigger payload and much longer range, and, likely cannot be used in 'saturation level activities' most times.
'hypersonic' are just cruise missiles that go a bit faster.
I think an issue is HIMARS rockets are quite cheap compared to S300 ones. It's all fine using a $3m missile against a fighter jet but against half a dozen inexpensive missiles incoming they are a bit stuck.
I read somewhere the Ukrainians were mixing cheaper non guided missiles in with the guided ones to make it harder for the Russians to shoot them all down.
Those ammo depots are not that far into Russian occupied territory. Do we even know if they have many S-X00s set up there, already? Also, Russian DoD or whatever they're called has reported intercepting some of those HIMARS.
Also, at the start of this, Ukraine had around 100 S-300s - which is one of the reason Russia has had a difficult time. Those are effective systems. And there's a reason the US made a big deal about Turkey purchasing S-400s.
> Do we even know if they have many S-X00s set up there, already?
Their targeting is such shit they can’t avoid shooting down their own materiel. Russia’s menace is more akin to the Taliban than the USSR or China. A pest due to proximity.
Friendly fire is a thing even for US troops; 24% of US combat casualties in the first Gulf War were blue-on-blue. It's definitely happening in Ukraine.
^ That's an old rusi post. Russia was not running a lot of air operations (other than choppers) in the beginning because Ukraine had 100 or so S-300 systems. Airplanes and pilots are expensive. But they've absolutely been ramping up air operations in the past several months. But in general, why send in a jet when a standoff missile will do the same job with less risk?
This by Andrei Martyanov (who's a US citizen fwiw) is worth a watch:
The tiff with Turkiye over their purchasing of the S-400's had nothing to do with their being highly effective (they are). The issue that the US had was simply with a NATO ally purchasing Russian defense equipment.
edit: respecting the Turks' rebrand, minus the special "u" character.
> Do we even know if they have many S-X00s set up there, already?
The alternative is that S-X00 systems are too expensive for Russians to deploy to protect their command posts and ammo dumps. Which... seems unlikely?
I think its more likely that the Russian systems failed, rather than the Russian army being too cheap / incompetent to deploy them to important locations like that.
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We also have the Moskova cruiser, which was using similar missile defense systems. Given that the Moskova sank vs a Ukrainian domestic cruise missile (the Neptune missile), we know its missile defense system was defeated by subsonic "normal" missiles.
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I really don't know why we'd ever invest into hypersonics, at least against Russia. Its abundantly clear to me that their missile defenses just can't handle normal missiles, let alone saturation attacks or hypersonics or whatnot.
> Meanwhile Russia is successfully fielding hypersonic weapons in it's invasion of Ukraine.
If Russia needs to use hypersonic weapons against Ukraine, that's frankly a bit embarassing. They're either having a harder time than they should be against Ukranian air defenses, or they're low on conventional missiles.
> Additionally, US air defense tech is severely lacking compared to Russia's multilayered systems.
The continued existence of the Ukranian Air Force (including drones taking out SAM sites) and the sinking of the Moskva seem to indicate the Russian air defense advantage may have been overstated.
Doesn't seem too embarrassing, they've hit several locations with high concentrations of foreign mercenaries and weapon stores with them. Mercenaries who survived reported that the incoming missile detection systems didn't go off at all.
And remember, Ukrainian air defense is mostly made up of upgraded Soviet (Russian) systems which just prove that the S-x00 and others are work well. And regarding the Moskva - it was a sitting duck, and an old duck with very outdated systems.
"The stockpile is unknown, they've already burned through half their likely inventory thus far, produce only a few dozen a year, and are using balistic missiles on weird targets" seems to point to the opposite conclusion they're going for.
Mind cluing me in to who "smoothiex12.blogspot.com" is, and why "Russia makes a lot of energy and aluminium" means they can produce sophisticated circuitry and fancy weapons in suddenly massive quantities?
The er.. much-vaunted S300 and S400 systems very recently proved ineffective against American HIMARS systems and the so-called 'hypersonic weapon' they used in Ukraine (never mind 'why?') was basically a sub-ICBM missile that didn't operate within a hypersonic envelope. Such 'hypersonic' weapons have been in a lot of countries arsenals for decades now, they just called them ICBMs or whatever.
The type of Hypersonic weapon mentioned in this thread is one that breaths air (either scram or ram jet, I forget)and so is an entirely different beast, one which Russia has no known capability of.
You seem to have a flawed interpretation of the events in Ukraine - if anything, this war seems to highlight just how utterly advanced NATO's weaponry is against an increasingly evident paper tiger. If Russia didn't have the nuclear card to play, the situation on the ground (and air, water) would be VERY different. I doubt Russia would exist in its current state by this stage, its military having been utterly routed. Sadly for Ukraine, they hold that card and threaten it often, like all decent states do... .
The Russian Paper Tiger was supposed to run out of munitions three months ago, yet - here they are day after day conducting massive artillery and missile attacks, intercepting much of what is thrown at them and consistently taking over territory. And that's with the Junior team (small invading force vs defending force); much of the ground fighters are actually from the Ukrainian Donbas.
Two of those articles are pre-war; bit weird to cite given the difference in Russian performance between the theoretical and the in-practice thus far.
Russia having lots of artillery tubes and shells has never been in doubt; it's other logistical aspects they seem to have struggled with. The gains in the Donbas are small, incremental, and balanced fairly well by losses near Kherson and Kharkiv. For the main axis of an invasion by one of the world's largest militaries, it's not much to brag about thus far.
Considering that Russia's top objective is to take the Donbas, that seems like a success. Ukraine is not Iraq 2.0; they are/were the largest military in Europe outside of Russia. And that is without considering all the western weapons and training support.
Yes, it's a clear failure thus far. Unexpectedly slow progress, unexpectedly high losses, and "we just want the Donbas" was clearly not the original goal. They're having to settle for that, and they'll have to hold it.
> Considering that Russia's top objective is to take the Donbas, that seems like a success.
Maybe you can borrow George W. Bush's "Mission Accomplished" banner?
I mean, state media had a victory article ready to go (https://www.bbc.com/news/technology-60562240), and it's fairly clear they were hoping to capture or exile Zelensky and other officials in the first few days.
> According to whom? Reddit armchair generals?
As of May, they'd lost more troops than they lost in a decade of bloody war in Afghanistan.
On the geopolitical front, it appears Putin also managed an own-goal by driving Finland and Sweden towards NATO membership. Even the most tortured propaganda doesn't manage to portray that as a goal of his.
> According to whom? The Kremlin never stated goals outside the original 4 or so.
Yeah, no. Do we consider western editorials as official government positions?
> As of May, they'd lost more troops than they lost in a decade of bloody war in Afghanistan.
Completely meaningless. We're talking a real (kinda) near-peer war vs playing in the sandbox vs guys in sandals with AKs. It's disingenuous to compare the two, and you know it. Iraq is not even a proper comparison. You'll need to compare what's going on now with WWII combined arms battles. Maybe some of the Korean battles.
> Even their stated goals included Ukraine's demilitarization and "denazification". Hard to do that if you stop at the Donbas.
Ukraine wasn't supposed to be a a “near peer” for Russia.
> You'll need to compare what's going on now with WWII combined arms battles.
The question, really, is whether domestic public (and elite) opinion sees the costs like an outside existential threat like WWII or an external intervention of choice like Afghanistan.
Oh, Russia are and have been for decades now, VERY GOOD at throwing heckloads of people and mid-late Soviet-artillery at A Situation to 'win' it. They tend to be somewhat Pyrrhic victories, but what does that matter when you utterly control the domestic narrative? The basic strategy of total annihilaton is the same one beloved of Stalin, who called artillery "the God of war". He wasn't wrong, but I'm not sure the people underneath it much appreciate its effectivity.
I don't think anyone beyond the ever-optimistic has at any point disputed that Russia has huge stocks of weaponry to draw from - it just doesn't have a lot of particularly technological or, dare I say it, 'graceful' weaponry to deploy.
Anyway, point here being that Russia doesn't have hypersonic weaponry in the vein tested by America here.
They do appear to want to invest in Satan-class mega ICBMs and even a nuclear-powered [highly-polluting] cruise missile, or the submarine-based nuke which 'could wipe out the British Isles' which is Putin's wet dream. Subtle. Think of the outcry if anyone in the west even considered such ridiculousness in this day and age... .
> US military doctrine states that an invading force needs a 3:1 attacker:defender ratio. Russia went in with the inverse of that and is still winning.
What do we define as winning here?, Ukraines tactic is to fall back to defensive positions when they are about to lose something so not to lose men. The gains Russia has made are very small and the amount of equipment and men it has taken to make them is huge.
Most of those games where made before long range heavy western weapons started being delivered too, I suspect their gains will slow down even further because of this.
Missile defense systems seem able to defend against normal rockets.
Hypersonics beat the defense by flying faster.
To defend against a hypersonic missile, you yourself need to build a hypersonic air defense missile.
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I still don't know if it's a practical weapon though. It seems like normal missiles / rockets are working vs Russia (Moskova and these ammo dumps this past week).
Maybe Chinas air defense is a worthy adversary. But it's clear we ain't building these for Russia...
I believe modern ICBMs are not really so defensible against. Perhaps some of the simpler ones like North Korean or Iranian ones. If nothing else, dropping a fast projectile from space is an easier way to create hypersonic speeds than using an air-breathing engine, and there's nothing stopping you implementing manouvreability into these (and I believe that's what modern ICBMs do at the end). US has missile defence programs but they don't seem like a huge priority in the grand scheme of things (just an amateur defence follower here).
The main thing about hypersonic weapons seems to be that others have them and US don't so it better close the hypersonic weapons gap. I suppose you never know where the technology might lead. But for example, during the Cold War, Russia had weaponry specifically designed for destroying US carrier groups, which were thought to be a major threat. Whereas US didn't need such weapons, since Russia didn't have carrier groups. So there can be a bit of asymmetry built in from the get-go.
ICBMs go hypersonic speeds. These "hypersonic" weapons don't fly a ballistic trajectory and are therefore:
- Easy to discriminate from ICBMs (e.g. potentially not start a nuclear war if you need a conventional "fast" weapons).
- Later/harder detectable, because they fly lower it can be more difficult to detect them.
- More manoeuvrable.
- Harder to intercept, an ICBM doesn't always fly at top speed, and travels in a predictable arc.
- Fancy / cool sounding, other countries have them, so none of the major players want to feel left out.
No- ICBMs at re entry are just as fast or faster than current hypersonic weapons. Upwards of Mach 20, depending on how you want to define the Mach number, whereas hypersonic are typically in the range of Mach 5-10.
The "hypersonic" term originally comes from describing the engine type of these weapons, not the vehicle speed. But the term has somewhat evolved over time to describe most any hypersonic (speed) vehicle that's maneuverable throughout its various flight regimes (that don't already fit an existing weapon category, like some air to air missiles).
Which means they don't follow a predictable flight trajectory like ICBM's.
The lack of a predictable flight path is what makes missile defense so much more difficult, not the speed.
I feel like the speed is what makes it difficult vs non-hypersonic missiles. Patriot/Aegis/Iron Dome/S-300/400/even CIWS seem to be relatively effective at defending against non-hypersonic maneuverable missiles.
ICBM reentry vehicles are hypersonic as well, but are (mostly) ballistic. The modern usage of the term "hypersonic missile" refers to maneuverable hypersonic missiles that can more effectively evade missile defense systems
Hypersonics are being made primarily to ensure MAD. The US is building a number of ballistic missile defense (BMD) systems, including Aegis BMD, THAAD, Patriot (to an extent), and GBI. There's enough of these to defend against a handful of missiles launched from North Korea or Iran, but not against all of Russia's fleet (assuming significant numbers of them still work of course). China has a significantly smaller nuclear arsenal, so they may be worried that the US could eventually have enough BMD to render their threat of MAD non-credible. Plus, they also want conventional hypersonics to better attack carrier strike groups
I'm not totally sure why the US wants to build nuclear hypersonics, since they have enough nukes in high enough readiness that nobody's going to be able to eliminate the threat of US MAD anytime soon. I think it's being done for simple research purposes so they have an idea what their enemies' hypersonics are like, and for prestige reasons
Not necessarily, ICBMs follow predictable ballistic flight paths. There's some space for weapons that are really hard to defend against due to unpredictable trajectories and really high speeds.
Iskander's reported (by the Russians) g tolerance is insane, they are supposed to handle something on the order of 50g. From what I understand this level of maneuverability makes missile defense extremely difficult.
Also, it's important to distinguish the acceleration along the axis (much easier to handle) from the perpendicular acceleration which is caused by aggressive maneuvering.
Also, Iskander is a short range ballistic missile, it is not the equivalent of the Minuteman. I don't think there is anything anywhere else that's closely comparable in capabilities to the Iskander.
“Acceleration up to 10 g's,” with tolerance for “experiencing g forces more than an order of magnitude higher.”
The tough bit is guidance system survival. For Russia, reliant on Chinese solid state tech, 50g is an accomplishment. For China or the U.S., the task is more trivial. (There is a broader point of blinded sensors.)
> don't think there is anything anywhere else that's closely comparable in capabilities to the Iskander
Because there are better tactical tools for almost every mission. Russia can’t maintain that diversity of materiel, so they monobody onto the Iskander.
Question, since you probably know more than me: what would be NATO's way of defeating a single high value target that is under good air defense? First suppression/defeat of that air defense, then launch Tomahawks or whatever other missiles are available? That's something I'd imagine an Iskander is good at. (My example may not be very realistic).
> what would be NATO's way of defeating a single high value target that is under good air defense?
Too many branches to give a meaningful answer. What kind of air defence? How high value? What’s the urgency? Need for deniability?
Iskander does okay for all those missions. But there are better tools for each branch. There is no mission profile I can think of (which, to be clear, isn’t worth much) in which Iskander opens novel tactical space. It’s compromises across the board.
> what would be NATO's way of defeating a single high value target that is under good air defense?
Wild Weasel air force pilots, who fly into areas of high air defense and fights it head on.
> First suppression/defeat of that air defense, then launch Tomahawks or whatever other missiles are available
Probably the opposite. Pilots and F35 are more expensive than Tomahawks. USA opened Iraq 2003 with 700+ Tomahawk missiles and then flew in with Wild Weasel pilots afterwards.
Bonus points: as the enemy shoots down Tomahawk missiles, you learn where their strongest air defense systems are.
So a massive bombardment of Tomahawk cruise missiles aimed at the most important radar / air defense systems / enemy runways, followed up by specialist pilots who train for the role of flying inside the enemy's air defense system.
Maybe 2003 Iraq is a bad example because their air defense system was basically crippled before the Wild Weasel pilots even entered the battlefield. Nonetheless, a huge saturation attack like that is what the USA is capable of. There's something to be said about just masses of missiles attacking all roughly at the same time... its really hard for defense systems to react to such a large mass.
Fyi, there are hypersonic ramjet tube artillery shells being developed by the Norwegians. Pretty cool stuff, great range extension and you don't have to worry that much about engine unstarts (some shells will simply miss, by a lot, if they unstart). And there is no problem with bringing the ramjet to the minimum operational speed, the howitzer does that for you.
Quick reminder that hypersonic weapons are not in any way new. Most ballistic missiles reach hypersonic speeds, the V2 rocket used by Nazi Germany in WW2 very nearly reached hypersonic speeds. ICBMs generally go above Mach 20. What is new here is an "air-breathing" cruise missile traveling at hypersonic speeds. It's not traveling in a ballistic arc, or gliding after a boost phase, but actually reaching hypersonic speeds "under its own power" so to speak. No weapon actually fielded today does that, though several countries are developing it (including the US, Russia with the Zircon missile, and India with the BrahMos-II).
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