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Sea Dragon- US Navy developing supersonic antiship missile for its nuclear submarines

F-22Raptor

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Identifying the mystery weapon
This weapon could be one of a number of concepts we identify below. But to start, a submarine-launched version of the SM-6 multi-role missile seems like the most conventional possibility. This is not a cruise missile, but the designation stated in the Washington Post's article could be just a due to the writer's lack of knowledge of existing weapon systems and their capabilities or just a misinterpretation of what is clearly a fairly opaque program.

The SM-6, which you can read all about in this recent profile we published on it, can be launched from the Mark 41 Vertical Launch Systems found on American destroyers and cruisers. In its latest form, it is fully networked, allowing it to receive targeting data from a variety of platforms, including airborne, ground-based, or surface-based sensor nodes. This concept is called Cooperative Engagement Capability/Naval Integrated Fire Control CEC/NIFC and it is one of the most important concepts the sea-going force is trying to implement at this time.

Although it was designed primarily as a surface-to-air weapon to be used against air-breathing threats and ballistic missiles during their terminal stage of flight, the SM-6 has an increasingly potent long-range anti-ship and a land-attack capability able to promptly strike targets over long distances. The fact that it flies at very high speeds on a ballistic-like track instead of a flat cruise missile like flight profile makes it especially hard for enemies to defend against.

Most of America's nuclear fast attack submarines and all its guided missile submarines have 'strike length' vertical launch cells similar to the Mark 41 VLS, that are used to house BGM-109 Tomahawk cruise missiles.

A new arrangement, with two large hatches that cover a number of launch tubes and can be more easily adapted to different weaponry, is now being fielded on latest Virginia class submarines. Soon boats equipped with the Virginia Payload Module, which carries four of these large modular missile bays, will be under construction.

These same cells currently used for Tomahawk cruise missiles could be configured to house an altered SM-6-booster combination capable of launching the missile submerged without destroying the launch cell. If such an arrangement were developed and implemented, the variety and flexibility of firepower that America's submarine force would possess would greatly increase.

Because the SM-6 is networked and doesn't rely on organic sensors installed on its firing platform for targeting, submarines could even act as clandestine launch platforms for anti-aircraft attacks. This would allow for more vulnerable assets, like E-2D Hawkeyes, MQ-4C Tritons, P-8 Poseidons, and powerful radar-packing surface combatants to stand off at long ranges, using their sensor's great reach—outside the range of their own or nearby weapons—to their advantage and remotely ordering up attacks on enemy ships and aircraft by surprise.

The unique list of information Chinese hackers stole from the Navy contractor also points to such a system, which would rely on electromagnetic threat libraries, crypto-communications, and a wide variety of sensors for detecting and engaging threats.

Raytheon, the company who makes the SM-6, has a long history of providing tailored weapons for American submarines, and some non-traditional programs have recently seemed to disappear into the realm of deep classification. For instance, the initiative to arm Navy subs with AIM-9X air-to-air missiles as a short-range last-line of defense against prowling anti-submarine warfare aircraft. That program went as far as being successfully tested before going dark, which you can read all about it in this past feature of ours.

It is also possible that the Washington Post article's author was wrong about the missile's supersonic capability, which would point to fielding an advanced anti-ship cruise missile like Lockheed's very stealthy and smart Long-Range Anti-Ship Missile (LRASM) aboard submarines. Yet this would probably be a less covert affair developmentally speaking. But such a weapon would be especially useful when combined with the SM-6—or another high-speed anti-ship weapon—allowing for long-range, multi-layer attacks on enemy flotillas. Also, the Navy, and its submarines will be getting a long-range, subsonic, anti-ship capability via the Block IV Tactical Tomahawk.

It's more likely that his weapon could actually be LRASM-B, or at least an evolutionary relative of it. LRASM-B was being developed alongside the subsonic LRASM-A around the turn of the decade and would have performance nearing Mach 3, operating in a similar fashion as the Russian-Indian developed BrahMos anti-ship missile.

Development work continued on LRASM-B until around 2013 when it was officially passed over. It is very possible that this design was brought back to life under the shadowy Sea Dragon program, with a focus on submarines as a launch platform, not ships. The budgetary dates and what was mentioned in the Washington Post article would certainly support this possibility as well.

Maybe even more promising is the possibility that this is actually the product of a supposedly defunct 2000s initiative to create a high-speed cruise missile dubbed Revolutionary Approach To Time-critical Long Range Strike, or RATTLRS for short. This weapon was all about hitting time-sensitive targets very quickly with little preparation, being able to fly at high altitudes and at speeds approaching Mach 4, obliterating its target with submunitions, a high-explosive warhead, or a penetrating warhead within about 30 minutes time at its maximum range.

This Lockheed-led initiative built on the Skunk Works' experience with the D-21 drone and was supported by the Office of Naval Research and NASA. It was funded throughout the 2000s, had successful payload delivery tests on the jet sled, its engine was built by Rolls Royce, and was approaching a complex flight demonstration phase when it disappeared. This could have been due to budget cuts that happened around the turn of the decade, but maybe it was revived in 2013, adapted for the anti-ship mission, and deep in development in updated form by 2015. It's also worth noting that a submarine-launched capability was part of the program's initial vision.

Adding to the case that RATTLRS may have been reborn in secret is this tidbit of information brought to us by our good friend Stephen Trimble's twitter feed. Apparently, the Navy has been showing off a model of this exact concept just months ago without any real explanation as to why:

Finally, the mystery missile could be a hypersonic missile, not a supersonic missile, for the Ohio class submarine, which the Navy is quietly developing and has test flown fairly recently. Still, the Pentagon has openly discussed these and other hypersonic tests recently, so it's not exactly top secret. Also, this wouldn't be a variation of an existing system as described in the Washington Post article. Fielding such a system operational by 2020 also seems remarkably ambitious, but it may be possible and certainly, China has an extreme interest in hypersonic technologies.

These are just the clearest possibilities for what this weapon could be. It's also possible that it is another weapon system clandestinely developed to a certain degree in the past, and brought back into development due to the changing nature of the world by the middle of this decade. During the mid-2000s, time-sensitive strike was such a big deal due to the Global War on Terror that numerous programs existed that never seemed to go anywhere—at least publically.

http://www.thedrive.com/the-war-zon...ship-missile-did-china-hack-from-the-u-s-navy
 
Hmmm...classified supersonic weapon? Not sure if that should be it. Its just speculation IMO.
 
Approach should be modular
New derivatives could be developed with addition or replacement of subsystems booster/engines
 

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