Benjamin Chung

4.8K posts

Benjamin Chung

Benjamin Chung

@ckfinite

Computer science PhD student at Northeastern University. I work on types in Julia, with rocket GNC, and a bunch besides. Also @[email protected]

Katılım Haziran 2011
219 Takip Edilen176 Takipçiler
Benjamin Chung
Benjamin Chung@ckfinite·
@6502_ftw @queenofthed @MBielieskov With respect to the engagement geometry, getting in front of a target missile is essentially the same kinematic problem as getting below it. Where differences can arise is if the target is trying to evade with aerodynamic maneuvering, but Kh-22 was not designed to do that.
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Benjamin Chung
Benjamin Chung@ckfinite·
@6502_ftw @queenofthed @MBielieskov This is well within the intercept envelope of Patriot, particularly since it's not a maneuvering target. Due to these issues, the Kh-22 is nowhere even particularly near a pacing threat for a modern SAM system. "Hard," today, would be Zircon that's doing mach 5 at 100 meters.
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Mykola Bielieskov
Mykola Bielieskov@MBielieskov·
Even a rather limited number of Patriot SAMs provided to UA proved to be a huge boost of UA air defense/anti-missile capability as recent events made clear.
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Benjamin Chung
Benjamin Chung@ckfinite·
@6502_ftw @queenofthed @MBielieskov Ukraine not having anything that can engage Kh-22 pre-Patriot is because of how old their missile park was (though S-300VM should have been able to). Regardless, Kh-22 is a much easier target than the maneuverable pseudo-BMs that both Patriot and SAMP/T use as reference threats.
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Benjamin Chung
Benjamin Chung@ckfinite·
@6502_ftw @queenofthed @MBielieskov Kh-22, by modern standards, is not particularly fast (cruise is at mach 5 at about 27km altitude) and doesn't really maneuver in so doing. The reference threats for modern systems are things like ATACMS or Iskander that are 2x faster, coming from higher, and are maneuvering.
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Benjamin Chung
Benjamin Chung@ckfinite·
@queenofthed @MBielieskov Kh-22 isn't a particularly challenging target for a modern SAM system; Kinzhal, Iskander, or even Kalibr all pose more a more challenging (faster, faster, lower altitude, respectively) threat. It was great for its era but that was ever so long ago.
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Tania
Tania@queenofthed·
@MBielieskov I'm waiting for a Kh-22 to be intercepted. As someone from Kremenchuk, I would then be justified in wanting to hold on to the necks of every "non-escalationist" in US administration.
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Chase Doak 🐻
Chase Doak 🐻@ckdoak·
@ACapaccio @elonmusk And the lens was a 200-500mm zoom lens with a 2x teleconverter attached. So a 1000mm focal length equivalent. Full frame sensor.
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Chase Doak 🐻
Chase Doak 🐻@ckdoak·
Not gonna lie. First, I thought this was a #ufo. Then, I thought it was @elonmusk in a Wizard of Oz cosplay scenario. But it was just a run-of-the mill Chinese spy balloon!
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Benjamin Chung
Benjamin Chung@ckfinite·
@n0x1ous @Buildzoid1 @VideoCardz No - "single seam" are better than the "double seam" that Nvidia used in their terminals (more terminal clamping force). We hadn't previously seen terminals of this design fail like this.
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Jeremy
Jeremy@n0x1ous·
@Buildzoid1 @VideoCardz Does this mean it’s a poor build quality of cable? Wondering if quality cablemod cables would have this issue
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Benjamin Chung
Benjamin Chung@ckfinite·
@IgorWallossek Either construction would have been fine because they're modern crimp terminals. Instead, the solder-on-bus solution in the connector means that the joint is unacceptably susceptible to mechanical failure causing high resistance. It's just a nonsense of a connector.
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Igor Wallossek
Igor Wallossek@IgorWallossek·
The horror has a face - NVIDIA’s hot 12VHPWR adapter for the GeForce RTX 4090 with a built-in breaking point. Cut open, analyzed and disposed of in the trash. A feast for the fire fighters #nvidia #rtx4090 #melting bit.ly/3swHRNV
Igor Wallossek tweet media
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Benjamin Chung
Benjamin Chung@ckfinite·
@KeysBeast1 @CommanderWolfyX @IgorWallossek @USCPSC Even if you don't have a bad solder joint solder is notorious for developing hairline fractures when subjected to mechanical loads. It's not a suitable termination methodology for this kind of cable and crimps have been de jure for decades for this reason exactly.
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KeysBeast
KeysBeast@KeysBeast1·
@CommanderWolfyX @IgorWallossek @USCPSC i saw that after i wrote it but they should have some sort of tabs helping to hold the wire in place if the solder lets go real easy to have a bad solder joint its not a logic board it tabs for the pins and crappy soldering
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Benjamin Chung
Benjamin Chung@ckfinite·
@namcost1theonly @IgorWallossek Nope. 16AWG can be terminated directly into PCIe power connectors with a crimp connection, see molex.com/pdm_docs/ps/PS…. This is likely what the PSU vendor's cables are doing. Nvidia's solution here is failing for all the reasons why soldered wire-to-board termination is bad.
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Benjamin Chung
Benjamin Chung@ckfinite·
@LupintheI @IgorWallossek Hell, you can even crimp in two wires per contact if you do it right and that with some careful design would likely let you make this adapter wherein they're splitting some of the supply pins.
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