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Test firing a custom 4 gauge shotgun

radx says...

Yes, that's a larger diameter than an anti tank rifle, which usually was between 12.7mm and 20mm. But compared to, say, a 20mm Lahti L39, this most likely uses a lot less propellant in the cartridge. A lot. Thus less muzzle energy, less recoil, less injuries.

For comparison, Rock Island had a four gauge and a .950 JDJ (that's ~24mm) in one of their auctions, and they took them out for some shooting. Here's the clip: link. And yes, that's Ian from FW in the background.

SFOGuy said:

That's larger than a WW I anti tank rifle bore, right? How did he not dislocate his shoulder?

Test firing a custom 4 gauge shotgun

radx says...

For people unfamiliar with "gauge": 4(12) gauge basically means that your barrel diameter is equal to the diameter of a lead ball weighing 1/4(1/12) pound.

In case of this 4 gauge shotgun, we're talking about a barrel diameter of almost 27mm.

eric3579 (Member Profile)

Keanu Reeves Tactical 3 gun shooting

radx says...

At the risk of sounding like an ass: every 3-gun match I've seen looked extremely narrowed down in terms of the required skill set. The shooters are ridiculously fast and accurate, but at the end of the day, it's tagging paper and steel with an AR-15 at 20m or less. Lots of skill required to be good at it, but oh so very narrow. Like high-power, if you will.

2-gun, run & gun, even cowboy action seem to require a more diverse skill set. Events like Red October, even though it had a lot of paper at point blank this year.

eric3579 (Member Profile)

WWII Russian prisoner of war HAD TO tell the world his story

radx says...

One number to illustrate how harsh the Soviet prisoners were treated: official records say more than 4000 Soviet prisoners died at the Stalag 3B in what is now Eisenhüttenstadt, compared to "only" 128 non-Soviet prisoners.

*promote

The moment when you dedicate your life to revenge

Largest Turboprop in the world Antonov AN 22 Manchester

radx says...

Counter-rotating propellers sparked my curiosity when I first saw them on a British Seafire Mk46 at a flight show in the early nineties.

So my amateur's answer would be that it's about the problem of turning the engine's power into thrust. With increasing power, you can either increase the propeller's RPM or its area. So you either a) spin it faster, b) increase its diameter, c) use a more favourable blade geometry, d) add more blades.

a) and b) both lead to blade tips moving faster, and once they approach the speed of sound, wave drag sets in and ruins your day. b) also runs into issues in terms of ground clearance. Thus the Kim Jong-un blades on planes like the An-70: short and fat.

c) is rather difficult to do in terms of manufacture -- that's why more pronounced blade shapes are a relatively recent development.

d) on a single propeller decreases the efficiency of each blade as it passes through the previous blade's vortex. That's why, for instance, German planes in WW2 almost exclusively relied on 3-bladed propellers with increasing blade size, whereas Supermarine went to four and even 5 blades rather quickly. You can work the issue to a certain degree by modifying the blade geometry, thus the 8 blade props on a modern A400M.

Adding more blades by adding another propeller gets around d), although the aft prop still loses efficiency compared to the front prop. On the other hand, counter-rotating props massively reduces problems with torque, which can be rather horrendous for single engine prop planes. The Bf 109, for instance, is (in)famous for being difficult during take-off as it pulls to the side quite violently.

moonsammy said:

I don't know enough about aerodynamics to understand how stacking the propellers like that makes any sense, so I'm just going to assume it's some sort of Soviet technomagic.

Cop Who Shot Walter Scott Pleads Guilty, Gets 20 Years

YouTube Rewind: The Shape of 2017 | #YouTubeRewind

radx says...

It's two for me: Gavin and Dan. Didn't recognize anyone else, not even when they listed the names at the end.

Speaks to the diversity of content on YT, doesn't it. At least for the time being, until the next adpocalypse or problems at Patreon.

eric3579 said:

I think i saw four or five YouTubers i knew and or sometimes watch. Weird because i watch a shit ton of videos.

eric3579 (Member Profile)

Honduras: One of the Worst Elections in Recent Memory

radx says...

Following the military coup in 2009 (supported by the Obama administration, especially HRC), the current government (supported by the Trump administration) kills activists left and right, and changes the results of last weeks presidential election as it pleases.

Ain't bipartisanship great...

newtboy (Member Profile)

eric3579 (Member Profile)

Gigantic Hornets Nest Extraction in Louisiana

radx says...

Doesn't make it less unpleasant, but those are wasps, not hornets.

Whoever discovered this blob of buzzing must have backed away very quickly, I assume. Might still be running, actually.



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