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LANTAC UK

Some High Speed Stills...

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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'').

 

300blk gram.jpg

300blk.jpg

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That’s brilliant thanks for posting interesting. Were most groups of photos consistent with each other or were their variances? 

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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.

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Wow, that looks incredible. Thanks for sharing the pics, hopefully there might be some follow up analysis to break it down.

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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...

1384166823_PSSVulfiringSP-4ammuntion.jpg.8274ce06a24ae37885095fea9184b5ac.jpg

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 piston 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.

363463929_SP-4rounds.jpeg.f9bd5a8e20702a5b220b77ea72e47f37.jpeg

The PSS is almost totally silent, other than mechanical noise, due to the use of the SP-4 round.

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Excellent ! Thanks for posting those BB69

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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

1485416565212.jpg.de383271c65526156908cc9460dabdf9.jpg

SP-16 round. Note the mostly encapsulated primer to stop it from being blown out by the internal pressure when ejected.

393204428_SP-16cutawayround.jpg.5c5baa9b3f8f29fe2430278ba700b5e0.jpg

PSS Vul being fired

 

PSS Vul internal operation (all in Russian, so mute it if it's annoying)

 

 

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Thank you to everyone for posting all the video clips etc. Absolutely fascinating slo-mo. :)

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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

1485416565212.jpg.de383271c65526156908cc9460dabdf9.jpg

SP-16 round. Note the mostly encapsulated primer to stop it from being blown out by the internal pressure when ejected.

393204428_SP-16cutawayround.jpg.5c5baa9b3f8f29fe2430278ba700b5e0.jpg

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

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