LANTAC UK Posted February 23, 2020 Report Share Posted February 23, 2020 A few stills from High Speed video. We purchase a Photron Fastcam last year that allows us to do in depth analysis of muzzle device design and gas flow in the real world. This was a 220Gr Subsonic 300 Blackout in quite a short barreled rifle (9.5''). Quote Link to comment Share on other sites More sharing options...
Gandy Posted February 23, 2020 Report Share Posted February 23, 2020 That’s brilliant thanks for posting interesting. Were most groups of photos consistent with each other or were their variances? Quote Link to comment Share on other sites More sharing options...
One on top of two Posted February 23, 2020 Report Share Posted February 23, 2020 Fantastic !! Quote Link to comment Share on other sites More sharing options...
LANTAC UK Posted February 24, 2020 Author Report Share Posted February 24, 2020 15 hours ago, Gandy said: That’s brilliant thanks for posting interesting. Were most groups of photos consistent with each other or were their variances? These were stills taken from video. The camera can record up to 1,000,000 frames per second at reduced resolution. You can capture a bullet at 20,000 to 40,000 quite effectively at HD resolution. Quote Link to comment Share on other sites More sharing options...
SchmidtP3 Posted February 24, 2020 Report Share Posted February 24, 2020 Wow, that looks incredible. Thanks for sharing the pics, hopefully there might be some follow up analysis to break it down. Quote Link to comment Share on other sites More sharing options...
Rutland lad Posted April 15, 2020 Report Share Posted April 15, 2020 Mmm. An unusual round. I know of only one reason to be using that. Stay safe. Quote Link to comment Share on other sites More sharing options...
BlueBoy69 Posted April 15, 2020 Report Share Posted April 15, 2020 Lovely imagery, well videography. Much better than the stuff I used to use, but that was 20 odd years ago... What frame rate and exposure were you using? Some interesting ways to visualise the flow field. The first, referred to as 'fast frame differencing', is covered in the video below. Go to about 7:15 if you don't want to watch the whole thing. It's that or use Schlieren, again covered in a video by the same person. I've used this method, but using the sun as the point source. Anyway, I bet it's not a quite as one of these... The Russian PSS (ПСС) Vul (Вул) semi-automatic silent pistol that fires the SP-4 (СП-4) captive piston round. It's a very weird gun as the chamber and barrel are separate entities. The former recoils a short distance with slide and the pressurised case within it before it finally extracts the case. Note that the SP-4 round itself is pretty complex so that it can seal the high pressure and temperature gas within after firing. The PSS is almost totally silent, other than mechanical noise, due to the use of the SP-4 round. Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted April 15, 2020 Report Share Posted April 15, 2020 Excellent ! Thanks for posting those BB69 Quote Link to comment Share on other sites More sharing options...
BlueBoy69 Posted April 15, 2020 Report Share Posted April 15, 2020 I had to rewrite the entry on it in the book Jane's Infantry Weapons (now known as 'Jane's Weapons: Infantry', but it just doesn't have the same ring) when I worked for Jane's, so had a lot of data. Well, you might like the replacement for the PSS... tada, the PSS-2! It's a far more pokey version of the PSS, firing the SP-16 round. The SP-4 fired from a PSS has an MV of between 195-205 m/s (640-673 ft/s), the bullet weight 9.91-10.0 g (153-154 gr), its muzzle energy about 200 J (147 ft.lbf). The SP-16's MV is around 300 m/s (984 ft/s) with a similar weight projectile, so about 2.25 times the muzzle energy. The projectile has a sharp chisel-shaped nose to penetrate soft body armour and helmets. Some images and videos below. A PSS-2 SP-16 round. Note the mostly encapsulated primer to stop it from being blown out by the internal pressure when ejected. PSS Vul being fired PSS Vul internal operation (all in Russian, so mute it if it's annoying) Quote Link to comment Share on other sites More sharing options...
les Posted April 16, 2020 Report Share Posted April 16, 2020 Thank you to everyone for posting all the video clips etc. Absolutely fascinating slo-mo. Quote Link to comment Share on other sites More sharing options...
brown dog Posted April 16, 2020 Report Share Posted April 16, 2020 16 hours ago, BlueBoy69 said: I had to rewrite the entry on it in the book Jane's Infantry Weapons (now known as 'Jane's Weapons: Infantry', but it just doesn't have the same ring) when I worked for Jane's, so had a lot of data. Well, you might like the replacement for the PSS... tada, the PSS-2! It's a far more pokey version of the PSS, firing the SP-16 round. The SP-4 fired from a PSS has an MV of between 195-205 m/s (640-673 ft/s), the bullet weight 9.91-10.0 g (153-154 gr), its muzzle energy about 200 J (147 ft.lbf). The SP-16's MV is around 300 m/s (984 ft/s) with a similar weight projectile, so about 2.25 times the muzzle energy. The projectile has a sharp chisel-shaped nose to penetrate soft body armour and helmets. Some images and videos below. A PSS-2 SP-16 round. Note the mostly encapsulated primer to stop it from being blown out by the internal pressure when ejected. PSS Vul being fired PSS Vul internal operation (all in Russian, so mute it if it's annoying) Fascinating! The round itself; the chamber arrangement. Amazing. If you want to start any other threads on similar unique weapons , please feel free to do so Quote Link to comment Share on other sites More sharing options...
MarinePMI Posted April 29, 2020 Report Share Posted April 29, 2020 That looks very similar to something I saw called a "Braddock" round, a few years back... Quote Link to comment Share on other sites More sharing options...
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