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8 Mar, 8 tweets, 5 min read
Intercept photos of South Korea's Haegung shipborne air defense missile. One of the few non-US systems to incorporate both a radar and IR seeker.

PC: ROK ADD
South Korea's Agency for Defense Development publishes quite detailed photos, video, and diagrams of their surface-to-air systems in particular. (Pictured: M-SAM-I and M-SAM-II)
More M-SAM intercepts and schematic.
ADD's brochure on L-SAM, their upper-tier missile defense system, includes these schematics of its exoatmospheric and endoatmospheric interceptors.
Also depicted in detail: the L-SAM's kill vehicle, MWIR IR seeker, and shroud separation mechanism. Also an interesting photo of a part in an anechoic chamber.
They don't use a notional landmass for this diagram. The capability is clearly directed at North Korea. Map locations approximate prior launch points?
A digram of the envisioned L-SAM kill chain. Info from long-range radar and Green Pine radars are fused to KICC and KTMO-Cell, and sent via Link-16 to the L-SAM battery operations center. The L-SAM command could share information with M-SAM and Patriot battery operations centers.
Older footage of M-SAM II intercept.

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More from @divert_thruster

Masao Dahlgren 2 Profile picture
5 Feb
Thread on Russian missile defense countermeasures I couldn't find a home for. According to V.C. Belous, Soviet design bureaus began development of balloon decoys and dipole chaff in the early 1960s; projects dubbed "Willow," "Cactus," and "Mole."

(Belous 2002)
It's hard to find which entities were involved, but the Central Research Radiotechnical Institute (CNIRTI) was the only one I found explicitly named. They reportedly developed varieties of chaff, decoys, jammers, and other devices since the 1950s.

(Spassky et al 2004)
Between 1960 and 1970, the Corporation of Research and Development establishments and other entities developed 9 decoy systems, named "List," "Pa'lma," "Ledokol," "Kiparis," "Bereza," "Kashtan," "Magnolia," "Lavr," and "Vyaz."

(Sergeev et al 2004)
Read 9 tweets
Masao Dahlgren 2 Profile picture
21 Dec 20
The Navy originally contemplated a variety of THAAD variants for its theater missile defense system before settling on the SM-3 design.

Photos: Johns Hopkins APL
Something I haven't seen much of was the SM-2 block IVA.

Photo: APL
The Block IVA, and THAAD, were some of the few interceptors designed with IR seekers for interception within the atmosphere.

Photos: APL
Read 13 tweets
Masao Dahlgren 2 Profile picture
30 Oct 20
Dr. Gillian Bussey reveals ongoing work on HyFly 2 airbreathing hypersonic weapon at IDGA Hypersonic Summit. Intended for use on carrier-based aircraft. Original HyFly program ended w/ unsuccessful flights in 2006, 2007. HyFly 2 completed Critical Design Review in the last year.
HyFly uses a Dual Combustion Ramjet, a hydrocarbon propulsion tech developed by JHU APL in 70s/80s and matured through HWT and ARRMD programs. Uses 2 sets of scoops & combustors for supersonic and subsonic combustion, allowing for performance over wider speed range up to Mach 6.
The Navy successfully tested a 50%-scale HyFly engine, FASTT, in 2005.
Read 7 tweets
Masao Dahlgren 2 Profile picture
28 Oct 20
More detail on Army-Navy cooperation for C-HGB/LRHW from this year's Hypersonic Weapons Summit. Both expected to share Navy-developed 2-stage booster. Image
More on the basing modes: Army expected to have battery of 2-round launchers for a total of 8 rounds/battery. Navy will certify cold-launch system for Virginia Payload Module. Image
Map of C-HGB flight tests and the test vehicle configuration. Image
Read 4 tweets
Masao Dahlgren 2 Profile picture
1 Sep 20
DoD 2020 estimates of China's missile force:

SRBM: 250 launchers, 600+ missiles
MRBM: 150 launchers, 150+ missiles
IRBM: 200 launchers, 200+ missiles
ICBM: 100 launchers, 100 missiles
GLCM: 100 launchers, 300+ missiles
Minor quirk on SRBM counts.
Here's how the *estimates* have changed since the 2019 report (pictured):

SRBM: ±0 launchers, missile est. less specific
MRBM: ±0 launchers, missile est. less specific
IRBM: +120 launchers, +40 to 120 missiles
ICBM: +10 launchers, + 10 missiles
Read 4 tweets
Masao Dahlgren 2 Profile picture
2 Oct 19
Recent firing of the Naval Strike Missile from USS Gabrielle Giffords reveals interesting serrated detail on the intake section.

Photo credit: U.S. Navy
More detail here. As @larthallor says, the photo could imply that multiple materials were used. This isn't groundbreaking; a similar approach was used on the SR-71. It could also be that the leading edge serration angles are optimized for different frequencies.
@larthallor And here's a cutaway of the NSM in its deck-mounted launch canister, illustrating its propulsion, fuel tank, warhead, and other systems.

Photo credit: Kongsberg
Read 6 tweets

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