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30 Oct, 7 tweets, 4 min read

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.

More from @divert_thruster

Masao‘s PDF stash

@divert_thruster

28 Oct

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.

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.

Map of C-HGB flight tests and the test vehicle configuration.

Read 4 tweets

Masao‘s PDF stash

@divert_thruster

1 Sep

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

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Masao‘s PDF stash

@divert_thruster

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

@larthallor

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

@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

Masao‘s PDF stash

@divert_thruster

27 Jul 19

1) 500 follower special: Let's talk about wind tunnel testing for reentry vehicles. Pictured: unnamed RV in NASA Langley's high-temperature structures tunnel. Test section diameter: 8 feet.

Photo credit: NASA

2) The flight regimes for strategic RVs are incredibly harsh. In 30 - 45 seconds, the RV reaches speeds up to 7km/sec and ~200g acceleration loads. For reference, an AMRAAM reaches around ~1.5km/sec.

Photo credit: DTIC

3) Hypersonic velocities are unattainable thru turbine-driven facilities. Instead, hypersonic tunnels store pressurized gas and blow them through expansion nozzles for short duration. The gas is then collected in vacuum chambers, like these at NASA Langley.

Photo credit: NASA

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