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Sturgeon's House


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Everything posted by Kal

  1. This technique could've been applied to silicon spring steel circa WWII if people had known about it, also it is very suitable for casting, it would've allowed for superior cheap cast turrets fro Soviet or Israeli tanks, but that era is over.
  2. https://impact.ref.ac.uk/casestudies/CaseStudy.aspx?Id=24686 it was originally developed from considering gun barrels, austenised steels can have superior properties to QT when the service tempertures go above QT' tempering temperature.
  3. http://msmsjec.blogspot.com/2016/08/super-bainite-high-hardness-steel.html Commercial Super Bainite Steel is low alloy –4.7% (Si Mn Cr Mo) –0.8% C -with no Al, Co, Ti, Ni. Proof Stress at 0.2% (0.2PS -Rp0.2) is -1673 MPa Ultimate Tensile Strength (UTS) (RMm) is -2098 MPa Elongation (El) is 11% Reduction of Area (RA) is5% Charpy Notch Impact number 5 Joule -based on a 10mm x 10mm specimen at room temperature Vickers Hardness (HV30) of 690HV30 Brinell (10 mm Ball, 3000 kg load) of 574HBW Rockwell C (20 degree cone 150 kg) of HRC 57 Available in a fixed width of 1250mm up to 5.5m length and two gauges 6.3mm & 8.5mm. Made as a Pearlite -easy to process Ballistic mass efficiency of 2.5 in a perforated steel armour system increasing the Carbon, and or adding Al,Co are the main ways to improve this steel. The key takeaway is that this is a lower cost/ lower performance version
  4. This is what also called pizza bainite, super bainite, etc It is (nothing more, nothing less) than replicating the bainitic matrix of ADI (Austempered Ductile Iron) in a steel. There are attempts to sell this as armour, for instance PAIVSE 600 https://www.tatasteeleurope.com/en/news/news/2013/2013_lightweight_armour_steel_trade It is very suitable for making in a perforated state, it can be supplied "soft" then punched/machined/rolled, and then austenised and controlled (slow) cooling for final hardness/strength. the main problem with this grade of steel, is that it requires a high carbon content (and high silicon) to drive the grain refining process to make it both tough and strong, unfortunately, that also makes not suitable for welding. Both PAIVSE 600 and it's Polish equivalent seem to have attempted to replicated superbainite, while keeping carbon low enough to be close to/within some other grade of steel, its still not suitable for welding, but its easier to source than purely optimized super bainite, although it not as good ballisticly as higher carbon versions. This style of steel was kinda accidental discovered by Francisca Caballero in Cambridge UK around the year 2000, by 2006 https://www.phase-trans.msm.cam.ac.uk/2006/ICASS.pdf https://link.springer.com/article/10.1007/s11665-013-0557-4/tables/2
  5. Phase 2 https://www.eos-aus.com/wp-content/uploads/2019/10/R400BrochureAUS_WEB.pdf https://www.defenceconnect.com.au/land-amphibious/5330-commonwealth-signs-land-400-phase-2-rws-contract So will it have M230LF?
  6. FWIW. A modern 50 tonne, 6 wheeled offroad mining vehicle can have a payload of between 80-96 tonne. So a wheeled vehicle with bolt on armour fraction of over 50% - 60% is not a difficult challenge using steel. How this applies to tracked vehicles? I dont know. But having a 1.5 tonne payload for every tonne of offroad truck seems like a COTS benchmark. https://elphinstone.com/wp-content/uploads/2019/10/Elphinstone-3900-Series-Specalog.pdf
  7. Hmmmm No Burnie Tasmania. (Elphinestone factory, Sential 2 - land 400 phase 2 contestant)
  8. Considering the local pollution, i sure hope the foam is mostly harmless, because if it cant handle the foam, it cant handle holland
  9. Another MBT APS, not suitable for use near infantry, so not suitable for IFV etc
  10. If they can get it work. 2xxx series has about 50% improvement over 5083 for ballistic resistance.
  11. Kal

    Boeing T-7A

    This is a big win for SAAB. The T38 was operational for 60years, so the T-7 could also be in operation until the end of manned fighters! Marketing wise, there are also interesting possibilities, Saab marketing to euro centric states, Boeing marketing for rest of globe. Perhaps a lot of porting from gripen/super hornet to T7A cab also occur for other operators.
  12. Kal

    Boeing T-7A

    https://www.boeing.com/defense/t-7a/ I know its not Northrop, but it reminds me of a scaled down YF-17 with only 1 engine. A spiritual successor to the T-38. Ie T38-F5-YF17-FA18-FA18F-T7A
  13. back of napkin cals a 100g cartridge of explodium is about 25mm dia and 185mm long, at 2.30 MJ/kg is about 230KJ An APFSDS might also be 25mm, if we very very crudely approximate the energy at 200mm offset, we get 1/66th of the energy available to induce some yaw, so thats about 3.5KJ. lets drop it down to 2.5kJ. This is approximately 5 baseball bat hits. but time left for momentum of yaw to take effect is perhaps 8m distance divided by 1600 m/s, so 1/200th of a second. so, yeah, thats enough to introduce some yaw, not much, but probably enough for 2-4 degrees of yaw.
  14. I don't think that represents how tanks would use DU as an armour. Thats more academic level study.
  15. dunno about that, if a computer can intercept a nasty at 800m/s, it can intercept a nasty at 1,600m/s question is, does the intercept reduce said nasty's penetration. Obviously an ATGM is far more fragile to attack than a solid rod of tungsten/DU etc.
  16. the best tank and being the benchmark tank often are quite different. Leopard 2 is a "better" tank than the T90/T72. doesn't mean that the T90/T72 isn't the global benchmark tank. Abrams is probably a "better" tank than a Leopard 2, doesn't mean that the Leopard 2 isn't the western benchmark tank. Egypt is supposedly buying some T90, despite getting near free Abrams, whatever the politics, I suppose ongoing costs are also large. just how much training can a non oil state afford with an Abrams.
  17. yeah, you are right. I'll just have to be patient, and wait for a photo to come up. Australia and UAE both seem to have M230LF, UAE's are thought to be mounted on an THeMIS unmanned ground vehicle. https://johnmenadue.com/mike-scrafton-facilitating-repression-abandoning-values/ but this is off-topic, although M230LF is an USA (Californian) product?
  18. Whatever is accessible in the front. Is design with hinges for easy accessibilty.
  19. EOS has sold RWS that support 30x113 to UAE, but those RWS are somewhat separate from the guns they carry. The australian ABC would lead us to believe that they have, personally I would expect that payment for the gun goes to a separate entity than payment for the RWS.
  20. comparing the AS21 to K21 they seem quite different, possibly the rear half is similar, but the front half appears really quite different. Do the lifting hooks reveal the weight distribution ? If so the weight is biased to the aft.. I can't see the equivalent on the Lynx.
  21. another russian patent wedge shape ERA https://worldwide.espacenet.com/publicationDetails/biblio?II=0&ND=3&adjacent=true&locale=en_EP&FT=D&date=20010620&CC=RU&NR=2169334C2&KC=C2#
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