@@ronanchristiana.belleza9270 Typically, barrel lengths are chosen based on how much powder you expect to burn, on average. You always want positive pressure behind the round until it is out of the barrel. Normally, without an evacuator, this pressure would equalize fairly quickly, and the toxic gasses could slip back into the crew compartment. I.e. a not very attractive plunger. The evacuator basically prolongs this equalization, and forces it to happen forward of the evacuator (away from the turret) like a (relatively) soft puff of air lasting for a few seconds after firing. This makes negative pressure near the crew compartment, to pull fresh air through the barrel while the breach is open, preventing toxic gasses from getting into the crew compartment. If you ever see old tanks lift their gun right after firing, they're doing this because they don't have an evacuator, typically. The hope is that they can point the gun up enough that the hot gasses want to escape away from the turret.
@@ronanchristiana.belleza9270projectiles create a vacuum behind them so without good evacuation Id expect the barrel to suck on the gases rather than expel them. but not too aggressively because it isn't sealed
I know I go on about quality and whatnot, but sometimes it is as simple as making something work. Quality should be seen as the best option for the specific task, not as the best thing ever in general
@@F.R.E.D.D2986quality doesn't have to be complicated. That evacuator is so simple there is really nothing that can go wrong with it. Probably only being replaced when they replace the barrel.
Ever seen how we tested the stabilizers for a tank once? We put a beer on the barrel and ped all over the place with it! We also ave silencers for tanks that look like dicks
my dad was a tank mechanic in the 80s. I was obsessed with tanks as a kid. I think I made him repeat everything he knew at least 100000x. I remember toward the end when I'd ask about the "barrel bump" the long explanation became "so the crew doesnt die" lol
I'm sure it must have made your dad really proud to be able to share his knowledge with you especially knowing it was something you had a sincere interest in. Stuff like that often means a lot more than we ever think about. Pretty cool y'all had that opportunity❤
Did the obsession turned into helping build bigger and better tanks? Otherwise there’s no major contribution to society it seems! This isn’t meant for your dad.
One night in Iraq that became known amongst my unit as "THE four hour fire fight" my light infantry unit was operating with a mechanized infantry unit. My best friend and I are in the prone with our SAWs pulling security and around us Abrams and Bradleys are zipping around almost running us over and the RPG's being shot at them were hitting right near us. This one Abrams took a hit, stopped, rotated it's turret towards the shooter, and BOOM fired it's main gun maybe 10 feet to my right. It was awesome but definitely did a number on my hearing. No clue what happened to the guy that thought shooting a RPG at an Abrams was a good idea.
@@douglasgay4497 Oh, I'd definitely not call who we were fighting soldiers. They were either gurillas or martyrs. The martyrs do the stupid stuff that gets them zapped and the gurillas live to fight another day and using the martyrs deaths as a recruitment tool.
@@douglasgay4497 To borrow from the Fat Electrician: He made the mistake of thinking he was the main character. He wasn't but he did get a 'conciliatory' mention in the credits as "Bologna Mist Cloud #1":
I was on the Sheridan, M48, M60, M60A1, M1 Abrams with a 105 mm rifle bore main gun. The bulge is a Bore Evacuator. It gets rid of gas after the main round is fired. It has to be unscrewed, the holes cleaned of carbon using very large q-tips.
Furries: furiously claim they are not zoo files Also furries: obsessed with animal parts to the point that it's the first thing they think about when watching a tank gun barrel video.
@@Hillary4SupremeRulerwhenever an object leaves a space, gases or fluids, depending where it is moving, fill the space the object was occupying. Watch again. Think of when a boat moves. Have you ever watched its wake?
Gas from tank round explosion bad. If no bulge present gas stay in barrel and when crew open barrel to reload round, gas go in where crew is and no good for crew. With bulge the gas is sucked out as round leaves. Hope that helped.
My dad was a tank commander (M4A3 Sherman) at the end of WWII. There was one little vent fan about the size of a kitchen fan in his tank. Firing the 75mm straight tube gun smoked the interior up so bad you could barely breathe or see. Dad said that’s why you always saw pictures of Sherman tanks with the commander standing in the hatch. That’s also why tank commanders had a short life expectancy in combat.
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
I was looking for this comment! I'll only read through the comments that follow a video &/or narrative that incorrectly describes the other, leaving the comment when required.
@@chev2500hd1 Wrong. The holes are 5 holes drilled at a 30 degree angle toward the muzzle. The Bore evacuator does not expand. Only some noob would call it "dragon's breath'. This sounds like something a private would make up. It's called a flare-back.
After the round is fired, the bulge stop the pressure wave from killing the crew. It allows the propellant gas to be delayed behind the round and escape through the front of the barrel after the round exits. I think.
No bulge = the excess gas is so much that it has to flow backwards into the crew causing all sorts of issues. Bulge = gas has more room to travel to while still able to propel the round forward and no gas into the crew
Does the breech open while the round is still traveling down the barrel? If not, why would the pressure inside the barrel be higher than inside the turret?
I was a 19K30 in the army for nine years. I was on a tank for those who don’t know. This thing is one smooth ride and firing on the run was a genius idea. I will tell you that in garrison they go 45 to 50 miles an hour. In war that governor is taken off and its balls to the walls. We could get it up to 70 if we needed to. This video is talking about the bore evacuator. Basically the round shell burns up in the main gun when fired and the smoke and fumes it creates comes out of that bulge. So all that’s left is the aft cap so it can be reused. It’s also another way of telling how many rounds we fired being the carry 40 rounds max.
Thank you for this, i tried looking up why a secondary puff of smoke comes out so much later than the initial firing and Google had no idea wtf i was talking about 😂
the exiting of the projectile acts to create a negative pressure in the barrel, therefore, the smoke will want to come out since everything seeks to be at equilibrium. hope i got it right
Here's how I understand it: During firing, lots of the toxic gas is ejected from the barrel, but some stays in the barrel and can be leaked back into the tank, especially once the toxic gas pressure inside the barrel drops below atmospheric pressure outside (~1 bar). By adding that attachment, some high velocity gas is slowed down, increasing its pressure (by the Venturi effect), allowing it to push out more of the high velocity, low pressure toxic gas after firing. Maybe I totally missed it idk lol
@deadlylampshade4065 I think the idea is that there's not a section of low pressure gas which sucks air into the barrel and forces it to move backwards into the crew chamber. It just equalizes the pressure in the barrel to keep the flow from reversing
@@deadlylampshade4065. There is no “clean” air. The gasses stored in the bore evacuate are pushed toward the muzzle and pull all the gasses in the bore with it.
@deadlylampshade4065 it doesn't need clean air. It just needs to get rid of the dirty air. The cannon can become a minor vacuum for a bit. The goal is to not get the toxic gases back in the crew compartment.
@@nesa1126 Probably not for the most part, but surely there are differences (however slight) between ones centered on the barrel and not, both from an engineering and a physics standpoint, otherwise they'd all be the same. Will have to do some reading 'cause it would be cool to know what they are.
@@brandonb6164 I'd considered that but it looked offset from the top too, as if the bore was on a diagonal, but perhaps that's just because of the viewing angle.
@@thomgizzizHave you ever fired an M1 Abrams main gun before? The M1 Abrams really is the best tank in the world along with the German Leopard 2. Look at what M1 Abrams did to Saddam Hussein Russian T-72 tanks in Iraq during "Operation Desert Storm" ....
@@224dot0dot0dot10 Those were "Lions of Babylon" tanks, locally produced in Iraq. They were not up to Soviet standard. Also the Abrams is much newer than the T72 and has undergone constant modernization upgrades. Bad comparison, guy.
You unscrew the evacuator before you go to gunnery and clean out the little holes with pipe cleaners. If they are dirty or clogged it’s possible they will not work properly and you will get the flames back inside the turret as soon as you fire.
@@TheXXIIIrdVet no clue. I wasn’t a master gunner. And I don’t think it affects the velocity. The APFSDS round exits the muzzle with a velocity at around 1mile per second.
Exactly, that floored me, it’s relatively “thin barrel” visible, it looks solid, not bending… would have never thought it was 3+ tons either. Goodness…
As a former armor crewman, we called the “bore evacuators”. Less smoke inside the turret and the rest was sucked out by the “turret evacuation fan”. I miss those days.
@@SelectCircle I think you're basing your opinion on youtube videos depicting 2 countries whos use of combined arms tactics and old tech leaves a lot to be desired. Further, current anti drone technology currently allows singular troop level engagement or swarm level engagement of drones. (VAMPIRE, Lattice and Anvil, DroneGun, Silent Archer, MEDUSA and Mjölnir to name a few) . Not to mention APS devices like TROPHY. Threats change, tactics/tech changes accordingly. Tanks will be around for centuries to come.
@@32Umzy It's almost a shame that on the future automated battlefield courage like yours won't be needed. The fighting will be done by drones and bots.
Derrrp the potentially harmful and (explosive) gas can enter the crew compartment. The gas byproduct of burned propellant is not flammable or explosive. Automatic 👎
It is more like an air pressure bypass. The round pushes airthrough the barrel in front of it and this pressure escapes into that device, instead of travelling all the way out the front of the barrel. The round passes the device and the pressurized air from the device flows into the barrel after the round again, flushing the propellant gases out of the barrel. And it might even reduce the resistance of the air in front of the round
So I initially assumed that it was for the gasses produced during the firing of the projector, however I did not realize it was to prevent the gasses from entering the crew chamber. That was a very cool video, awesome job!
Some people say it is better to have a magic sword than a magic shield but to them I say NEIN!!! Warfare is SCIENCE! The science of shields! "But Karl what do you think of das axe oder spear" I say this is RUBBISH!!!
That isn’t a very good depiction of how a bore evaluator works. There are four small holes in the barrel angled toward the muzzle. As the round goes past, some of the gasses pressurize the bore evacuator. After the round leaves the muzzle and the pressure equalizes the gas in the bore evacuator rushes out pulling the gasses in the barrel with it.
That makes more sense than most of these other attempts to explain it. I think it's fair to say that many people who watched this video fundamentally didn't get it, which leads me to think he didn't explain it well.
@@tanker335 Never made it to Germany until after I retired. I bounced back and forth between Korea and the states. I know the DMZ well. I was on M60A3s for 4 1/2 years. Great tank.
The Boar Evacuator allows a high pressure to form and as the round leaves the barrel and SUCKS the remaining gasses out of the barrel because a low pressure at the barrel holes draws the high pressure gasses at the boat evacuator.
I always figured it had something to do with equalizing pressure, or possibly being a cooling mechanism to prevent the barrel from warping. It's so you don't choke. Huh.
@chev2500hd1 From what i can see of this, the gases are pushed out, in much the same way you'd be pushed out (and not pulled or sucked out) an aeroplane window if it were to break.
@@castleanthrax1833 brother, do you know what the venturi effect is? the gasses are pulled out by way of vacuum. dont rely on this animation of the bore ecav in operation it is 100% incorrect
@@chev2500hd1 This is a simple equalisation of pressure. There is no constant mechanical force involved. The action of the shell creates a partial vacuum, and then the equalisation of pressure forces the remaining gases out of the barrel.
😂 not one single word to explain how the gasses escape better because of the bulge. Just banal descriptions. What concept is happening to evacuate the bore better? You literally say that atmospheric pressure can prevent gasses from exiting the bore, yet the bulge changes nothing about that, and expels gasses forwards exactly the same as if there were no bulge at all. Maybe this is explained properly in the full video, but this short needs to be deleted. Embarrassing from a channel I typically respect.
Fun fact: The first tank gun to feature bore evacuators is the British Royal Ordnance L7 which was designed in the late 50s! It was used on tanks like the Centurion, Leopard 1 and the M48 Patton.
Do the gases not shoot forward and escape out the barrel in front of the round as it travels through the chamber? I could see why this would evacuate pressure (assuming the pressure in the barrel is less than 1 atmosphere a moment after firing) but how does that not invalidate the pressure built up in the end half of the barrel, where accelerating the round is concerned? Just seems like something that would perform at its function better if it was closer to the end of the barrel, much like how a flow-through suppressor works on a rifle barrel to reduce back pressure and gases in the face of the shooter.
There are videos of MBTs firing their main guns on YT. If it has a bore evacuator, there will be a puff of smoke coming out of the barrel a second or two after the round leaves the gun. If you have ever wondered why that happens, it is the bore evacuator in action.
Imagine how insane this idea must’ve sounded “What if we make it wider so that gas can get away from the projectile,and then have it get sucked out when it leaves the barrel”
29 วันที่ผ่านมา
Somebody had to picture fluid dynamics in order to come up with that idea, and then they had to put it in terms everybody can understand. Now that's genius!
Modern ammunition, both anti-tank and high-explosive, usually contains stabilizing fins to keep the round on straight flight instead of rifling the barrel. As projectiles fly at faster and faster speeds, it takes more energy to spin the projectile so that it maintains stability. Moving to fin-stabilized rounds means more energy can be put into sending the round down-range instead of spinning it so it flies straight. Some nations have been slow to adopt this. The 120mm guns the British use on their Challenger 2s have all been rifled because the HESH (High Explosive Squash Head) rounds they use are more effective when spinning. With the emergence of the Challenger 3, they are beginning to use smoothbores now.
And the round exiting the barrel acts as a plunger pulling the gases with the rounds exit out of the barrel. Smart.
It would still do that without the evacuator
@@LanaaAmornot nearly as effectively, though
@@yerteth Can you explain please?
@@ronanchristiana.belleza9270
Typically, barrel lengths are chosen based on how much powder you expect to burn, on average. You always want positive pressure behind the round until it is out of the barrel.
Normally, without an evacuator, this pressure would equalize fairly quickly, and the toxic gasses could slip back into the crew compartment. I.e. a not very attractive plunger.
The evacuator basically prolongs this equalization, and forces it to happen forward of the evacuator (away from the turret) like a (relatively) soft puff of air lasting for a few seconds after firing. This makes negative pressure near the crew compartment, to pull fresh air through the barrel while the breach is open, preventing toxic gasses from getting into the crew compartment.
If you ever see old tanks lift their gun right after firing, they're doing this because they don't have an evacuator, typically. The hope is that they can point the gun up enough that the hot gasses want to escape away from the turret.
@@ronanchristiana.belleza9270projectiles create a vacuum behind them so without good evacuation Id expect the barrel to suck on the gases rather than expel them. but not too aggressively because it isn't sealed
The fact that the cannon alone weighs 3.3 tons is mind-blowing.
So is the round that exits it
I love how so many people are missing the joke that the explanation has more likes
@@aplanenerdandagamenerd9087What? no
@@artraudgaming3575 Pretty sure they're saying the round is mind blowing, not that it weighs 3.3 tons.
And they're right.
@@CSpottsGaming ah yeah
Not sure if it means the entire upper turret or the barrel? Hard to imagine that the barrel weighs that much alone.
As someone with a gun bulge himself, this was very insightful
Sounds painful, see a doctor 😂
Bro💀💀💀💀
Me too right up top
I guess your gun bulge is for evacuating gas. I’m sorry to hear that.
That's not right if it's the middle
That's how you identify the adult male tanks.
LMAO
female tanks have machine guns only
🤦🏾♂️🤣 Stop
it removed my comment on tankettes
I agree. This guy has a nice description but it’s all wrong. That bulge is representative of the bulge I get from all of that freedom.
I like the logic behind simple engineering like this, it simply works so there's no need to overcomplicate the process
"It works, there's no moving parts to get f@cked, means less maintenance."
K.I.S.S. in action; Keep It Simple, Stupid.
"It just works"
The best solutions for the problems usually are the simplest!
I know I go on about quality and whatnot, but sometimes it is as simple as making something work.
Quality should be seen as the best option for the specific task, not as the best thing ever in general
@@F.R.E.D.D2986quality doesn't have to be complicated. That evacuator is so simple there is really nothing that can go wrong with it. Probably only being replaced when they replace the barrel.
Bro you have no idea how happy it makes me that you don’t use an ai to voice your shorts 😭
AI narrator are ruining youtube I swear
@@xenostimye, using your own voice is a USP nowadays lol
it makes you that happy? stop crying for god's sake.
@@gordonlekfors2708stop crying
His accent is equally annoying.
Those German engineers are fucking wizards
Good old Kraut space magic
Ever seen how we tested the stabilizers for a tank once? We put a beer on the barrel and ped all over the place with it! We also ave silencers for tanks that look like dicks
Quite literally, too.
Poor wizards.
@@kampfmuffins5507 Just read this comment and dying for more context, please fill me in with more tank info I won't realistically ever use.
I also have a bulge in my midsection, and evacuating gasses is a concern for anyone around me.
Your Adam’s apple that huge? You know what they say about men with big Adam’s apples…
🤣
You might want to see the doctor if there’s one in the back too
😂
You need an expansion valve
That bulge has been there since that trip to Saigon. My doctor told me it's normal. Oh you mean the bulge on the barrel of the tank...
😂😂😂
Very clear explanation. I was a tanker for 8 years. We just told people "because" 😆
Excellent clear and succinct explanation lol
Same here for the same time. Sometimes, it's easier just to say that than to go into detail. Like how a CITV works lol
You see when a male tank sees a female tank...
Best comment 😭
lol
Tank nicknamed "big papa" seeing the tank nicknamed "big mama"
if only half of a males "barrel" bulges... they really need to see a doctor
You didn't say that in your Mike Brady voice,"You see ,Bobby...."& drone on until the point of boring the entire audience.
my dad was a tank mechanic in the 80s. I was obsessed with tanks as a kid. I think I made him repeat everything he knew at least 100000x. I remember toward the end when I'd ask about the "barrel bump" the long explanation became "so the crew doesnt die" lol
I'm sure it must have made your dad really proud to be able to share his knowledge with you especially knowing it was something you had a sincere interest in. Stuff like that often means a lot more than we ever think about.
Pretty cool y'all had that opportunity❤
Did the obsession turned into helping build bigger and better tanks? Otherwise there’s no major contribution to society it seems! This isn’t meant for your dad.
@@alvaroq2024 What im the fuck are you even trying to say here dude?
sure kept his mind refreshed on a bunch of stuff we would forget as mechanics
@@DrMurdercock Summary his dad didn't hug him enough and now HE is a dick.
For those of you that dont know, the German engineers used magic to make the barrel within remain floating.
Ah, more of that infamous Kraut Space Magic.
Vril
Stolen Dutch magic seems more likely.
You just put a note on the drawing and it happens.
Me while I watch this:
Don’t make a bulge joke
*DON’T DO A BULGE JOKE*
Must be a real battle, huh?
@@rainbowwhitey9274 I literally made this comment to get the 2,000 comment
One night in Iraq that became known amongst my unit as "THE four hour fire fight" my light infantry unit was operating with a mechanized infantry unit. My best friend and I are in the prone with our SAWs pulling security and around us Abrams and Bradleys are zipping around almost running us over and the RPG's being shot at them were hitting right near us. This one Abrams took a hit, stopped, rotated it's turret towards the shooter, and BOOM fired it's main gun maybe 10 feet to my right. It was awesome but definitely did a number on my hearing. No clue what happened to the guy that thought shooting a RPG at an Abrams was a good idea.
Lol, some soldiers aren't very smart.!
I think we have a pretty good idea of what happened to him, lol. Thanks for your service sir
@@douglasgay4497
Oh, I'd definitely not call who we were fighting soldiers. They were either gurillas or martyrs. The martyrs do the stupid stuff that gets them zapped and the gurillas live to fight another day and using the martyrs deaths as a recruitment tool.
@@Aquablecs
Yeah I would've loved to see his face when he realized those 70+ virgins are all dudes like him lol.
@@douglasgay4497 To borrow from the Fat Electrician: He made the mistake of thinking he was the main character. He wasn't but he did get a 'conciliatory' mention in the credits as "Bologna Mist Cloud #1":
Is that a bore evacuator, or are you just happy to see me?😩
😂😂
Lmfao!😂😂😂
American Freedom is in fact delivered by Germany, how ironic xD
USSR too.
And British armor
@chipschannel9494 we use a different variety of composite armor than British choban. Ours includes depleted uranium while theirs does not.
@@davesomeone4059 USSR is a joke.
@@belekas2729 and yet had better rocket motors than anyone in the west for 40 years lol
I was on the Sheridan, M48, M60, M60A1, M1 Abrams with a 105 mm rifle bore main gun. The bulge is a Bore Evacuator. It gets rid of gas after the main round is fired. It has to be unscrewed, the holes cleaned of carbon using very large q-tips.
Yes, the M1A1 doesn't have a 120mm gun as he mentioned - that was only the M1A2.
@@yorokobi9530 ?? part of the M1A1 upgrade program was the addition of the 120mm gun
I need some of these big Q tips
I do not miss the borescope... lol. better than changing track though..
Which is your favorite and why?
"Gun Knot"
*I TRIED TO STOP MYSELF FROM SAYING IT*
Great. Now cannot unsee.
If you're just gonna go for it, I have to:
**notices your explosive gas reservoir** OwO what's this?
Found the animal molester.
It's okay we understand
Furries: furiously claim they are not zoo files
Also furries: obsessed with animal parts to the point that it's the first thing they think about when watching a tank gun barrel video.
RealEngineering: _notices bulge_ "UwU what's this?"
Edit: I'm sorry.
Thanks for the comment
The reaction time on you thinking of and posting this comment was concerningly fast
You should be.
Apology begrudgingly accepted but don't do it again
Why are you like this? I laughed tho so worth it, thank you
Thank you for that explanation. Now I just need to understand what the explanation means 😂
Seriously I don't get it 😔
@@Hillary4SupremeRulerwhenever an object leaves a space, gases or fluids, depending where it is moving, fill the space the object was occupying. Watch again. Think of when a boat moves. Have you ever watched its wake?
It just means you do not get the gas from a fired round inside the tank when you reload the gun.
Gas from tank round explosion bad. If no bulge present gas stay in barrel and when crew open barrel to reload round, gas go in where crew is and no good for crew. With bulge the gas is sucked out as round leaves. Hope that helped.
They just complicated things more than necessary
It’s called “The Pleasure Ring” for the untrained eye.
💀
My dad was a tank commander (M4A3 Sherman) at the end of WWII. There was one little vent fan about the size of a kitchen fan in his tank. Firing the 75mm straight tube gun smoked the interior up so bad you could barely breathe or see. Dad said that’s why you always saw pictures of Sherman tanks with the commander standing in the hatch. That’s also why tank commanders had a short life expectancy in combat.
Nah that's just where the shell break dances for a second.
real
Just like a 2-stroke exhaust works: venturi effect.
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
I was looking for this comment! I'll only read through the comments that follow a video &/or narrative that incorrectly describes the other, leaving the comment when required.
@@chev2500hd1 Wrong. The holes are 5 holes drilled at a 30 degree angle toward the muzzle.
The Bore evacuator does not expand.
Only some noob would call it "dragon's breath'. This sounds like something a private would make up.
It's called a flare-back.
@mattz1230 lol okay toughie
Thanks for explaining. I still don't get it.
After the round is fired, the bulge stop the pressure wave from killing the crew. It allows the propellant gas to be delayed behind the round and escape through the front of the barrel after the round exits. I think.
No bulge = the excess gas is so much that it has to flow backwards into the crew causing all sorts of issues. Bulge = gas has more room to travel to while still able to propel the round forward and no gas into the crew
It prevents the crew from being miserable to the point of permanent health issues by making sure the smoke exits the barrel on the correct side
Does the breech open while the round is still traveling down the barrel? If not, why would the pressure inside the barrel be higher than inside the turret?
It's also a first approximation silencer, Rolls Royce use something similar on car exhausts.
Placement also prevents 'barrel whip' by deharmonizing it's length's natural frequency.
Huh¿¿
The tank is just happy to see us!
I was a 19K30 in the army for nine years. I was on a tank for those who don’t know. This thing is one smooth ride and firing on the run was a genius idea. I will tell you that in garrison they go 45 to 50 miles an hour. In war that governor is taken off and its balls to the walls. We could get it up to 70 if we needed to. This video is talking about the bore evacuator. Basically the round shell burns up in the main gun when fired and the smoke and fumes it creates comes out of that bulge. So all that’s left is the aft cap so it can be reused. It’s also another way of telling how many rounds we fired being the carry 40 rounds max.
Thank you for this, i tried looking up why a secondary puff of smoke comes out so much later than the initial firing and Google had no idea wtf i was talking about 😂
😂😂BAAHAAHAA HILARIOUS 😆😆😂🤣🤣😂😂😂🤣😂😂
No our shop replaced the barrel and anything that you want to know I will explain it to you!!! It was my job in the ARMY 45G 45K !!!!
@@bryanhill3041Your US Army MOS was 45G (forty five golf) or was your US Army MOS 45K (forty five kilo) ?
the exiting of the projectile acts to create a negative pressure in the barrel, therefore, the smoke will want to come out since everything seeks to be at equilibrium.
hope i got it right
Here's how I understand it: During firing, lots of the toxic gas is ejected from the barrel, but some stays in the barrel and can be leaked back into the tank, especially once the toxic gas pressure inside the barrel drops below atmospheric pressure outside (~1 bar). By adding that attachment, some high velocity gas is slowed down, increasing its pressure (by the Venturi effect), allowing it to push out more of the high velocity, low pressure toxic gas after firing.
Maybe I totally missed it idk lol
I think you’re spot on with this
But where does the 'clean' air come from? How isn't this just expelling toxic gas with more toxic gas?
@deadlylampshade4065 I think the idea is that there's not a section of low pressure gas which sucks air into the barrel and forces it to move backwards into the crew chamber. It just equalizes the pressure in the barrel to keep the flow from reversing
@@deadlylampshade4065. There is no “clean” air. The gasses stored in the bore evacuate are pushed toward the muzzle and pull all the gasses in the bore with it.
@deadlylampshade4065 it doesn't need clean air. It just needs to get rid of the dirty air. The cannon can become a minor vacuum for a bit. The goal is to not get the toxic gases back in the crew compartment.
Why is it shown as being offset on the tank but not in the diagram?
I don't think it changes anything
Because the diagram is a view from the top
@@nesa1126 Probably not for the most part, but surely there are differences (however slight) between ones centered on the barrel and not, both from an engineering and a physics standpoint, otherwise they'd all be the same. Will have to do some reading 'cause it would be cool to know what they are.
@@brandonb6164 I'd considered that but it looked offset from the top too, as if the bore was on a diagonal, but perhaps that's just because of the viewing angle.
I believe it was designed that way so the evacuator would be able to clear the upper glacis of the tank when fully depressed
Bro, is that Super Eyepatch Wolf narrating?
I am so sorry but I cannot unhear super eyepatchwolf's voice
Germans must be so proud, after so many years their guns are still the best!
Those are used on literally the oldest and worst tanks the US has at this point... smh
@@thomgizzizHave you ever fired an M1 Abrams main gun before? The M1 Abrams really is the best tank in the world along with the German Leopard 2. Look at what M1 Abrams did to Saddam Hussein Russian T-72 tanks in Iraq during "Operation Desert Storm" ....
@@224dot0dot0dot10 Best tank in the world, I need some of what you've been smoking.
@@224dot0dot0dot10 Those were "Lions of Babylon" tanks, locally produced in Iraq. They were not up to Soviet standard. Also the Abrams is much newer than the T72 and has undergone constant modernization upgrades. Bad comparison, guy.
@@krashdso whats the best in your opinion then? enlighten us
It would've been so effective in the battle of the bulge
More like the battle of my bulge
🤨🤨
I see what you did there...
@@suntzu1409 with you art of war, it would've been used in the battle of the bulge
Battle of the bulgey wulgy
You unscrew the evacuator before you go to gunnery and clean out the little holes with pipe cleaners. If they are dirty or clogged it’s possible they will not work properly and you will get the flames back inside the turret as soon as you fire.
So... does the evacuator bleed barrel pressure from the round?
Does the projectile lose velocity after the evacuator?
@@TheXXIIIrdVet no clue. I wasn’t a master gunner. And I don’t think it affects the velocity. The APFSDS round exits the muzzle with a velocity at around 1mile per second.
?
That’s the knot
🤨
Bro fr 💀
💀bro
noooooooo im sobbing
why was i thinking the same thing 😢
And you have to clean it, well, very well.
The Natzis nocked out K Company 79th Army Infantry Division.
3.3 TONS?! Imagine the gun your packing weighs as much as 3 sedans. Jesus christ.
Whole vehicle is upwards of 70 tons...
@@coydavis1340 Wow, that's crazy. That's at least two of my exes.
What sedan weighs 1 ton?
Exactly, that floored me, it’s relatively “thin barrel” visible, it looks solid, not bending… would have never thought it was 3+ tons either. Goodness…
@@FireRupee or near a tenth of your exes mom! D:
Is that a bore evacuator or are you just happy to see me?
As a former armor crewman, we called the “bore evacuators”. Less smoke inside the turret and the rest was sucked out by the “turret evacuation fan”. I miss those days.
What do you think now that cheap little drones have made tanks obsolete?
@@SelectCircle I think you're basing your opinion on youtube videos depicting 2 countries whos use of combined arms tactics and old tech leaves a lot to be desired. Further, current anti drone technology currently allows singular troop level engagement or swarm level engagement of drones. (VAMPIRE, Lattice and Anvil, DroneGun, Silent Archer, MEDUSA and Mjölnir to name a few) . Not to mention APS devices like TROPHY. Threats change, tactics/tech changes accordingly. Tanks will be around for centuries to come.
@@32Umzy So you'd hop into a tank and floor it for the front lines?
@@SelectCircle I did it for quite a few years, so if recalled (to a U.S conflict), the answer would be yes.
@@32Umzy It's almost a shame that on the future automated battlefield courage like yours won't be needed. The fighting will be done by drones and bots.
Proud 19 Kilo here 🫡🇺🇸💪🏻
Derrrp the potentially harmful and (explosive) gas can enter the crew compartment.
The gas byproduct of burned propellant is not flammable or explosive. Automatic 👎
so it's for muzzling? UwU
more like the tank equivalent of preventing constipation and having your small intenstine explode because of that
It is more like an air pressure bypass. The round pushes airthrough the barrel in front of it and this pressure escapes into that device, instead of travelling all the way out the front of the barrel. The round passes the device and the pressurized air from the device flows into the barrel after the round again, flushing the propellant gases out of the barrel. And it might even reduce the resistance of the air in front of the round
*nuzzles your evacuator bulgey wulgey" OwO such a big gun tee hee~
The number of furries in these comments tho 🤣🤣🤣🤣
@@SkilletFlooferI swear half the furry fandom is milfurs OR programmers running the world.
I'm pretty sure half the military is just Furries too.
😂 damn Rhinemetal still making weapons we just pretty much adopted Germany's War Machine
What can I say, we are good at making cannons :P
If it ain't broke, don't fix it.
You're welcome BTW
They own the patent, and licensed the invention to us.
USA conquered Germany and now can steal every pattern rights
So I initially assumed that it was for the gasses produced during the firing of the projector, however I did not realize it was to prevent the gasses from entering the crew chamber. That was a very cool video, awesome job!
Supereyepatchwolf is really diversifying his content. Good for him 😂
My father was saved by a USA Army black mem tank Batalion in the Battle of the Bulge in the North PART OF Germany.
I was taught that it's a "fume extractor." Same thing, different description.
German engineering ist ze finest in ze world
Think you mean ZA WARUDO
I would hire a German company to make medical and scientific instruments. I would NOT hire them to make shovels. ❤
@@andrewstallings6548 You must be one of the Germans, that is very efficient thinking.
@@andrewstallings6548 I don't get it. When did germans fuck up making shovels?
Some people say it is better to have a magic sword than a magic shield but to them I say NEIN!!! Warfare is SCIENCE! The science of shields! "But Karl what do you think of das axe oder spear" I say this is RUBBISH!!!
That isn’t a very good depiction of how a bore evaluator works. There are four small holes in the barrel angled toward the muzzle. As the round goes past, some of the gasses pressurize the bore evacuator. After the round leaves the muzzle and the pressure equalizes the gas in the bore evacuator rushes out pulling the gasses in the barrel with it.
That makes more sense than most of these other attempts to explain it. I think it's fair to say that many people who watched this video fundamentally didn't get it, which leads me to think he didn't explain it well.
@@davidhoffman6980 Well, I was a tanker for 25 years and ended up as a Master Gunner so I know my way around a tank.
@@TheJimtanker Charlie Co. 3rd Batt. 35th Armor. I was lucky enough to serve on the M60A3 and the M1A1. I have a jar of dirt from Graf on our mantle.
@@tanker335 Never made it to Germany until after I retired. I bounced back and forth between Korea and the states. I know the DMZ well. I was on M60A3s for 4 1/2 years. Great tank.
@@TheJimtanker I drove our blade tank. Occasionally, I'd let our XO pretend it was his tank.😄
Hold up…that voice sounds familiar…is that super eyepatch wolf???
The guy narrating this sounds like Super Eyepatch Wolf
Its the catalytic converter duh
Nope. Duh.
Bore Evac. Shoots the majority of the gases out the end of the tube
Gem-Tech makes an AR-15 upper with a similar bulge on the barrel to reduce gases going back to the shooter.
Why? The AR platform is gas-operated, which requires the pressure to cycle the bolt.
Unless they've developed something new, which is a possibility.
@@georgetheofanous6792 not all of that gas is needed
@@crash86ed Understood. I learned something new today. Thanks.
Catalytic converters 😊
Thats a catalytic convertor
Which was the first tank to be fitted with a muzzle brake?
Not counting prototypes and tanks that never went into major production, probably the Panzer IV in the late 30's.
Keeping that barrel straight is a major priority
Gay ones won't work as well.
and polished 🥴
I always thought it was an evolutionary adaptation for mating. The more you know.
just finished the rotc, getting deployed tomorrow. Wish me luck brothers.
Imperialist weapons.
So, the tank can fart.
lol
The Boar Evacuator allows a high pressure to form and as the round leaves the barrel and SUCKS the remaining gasses out of the barrel because a low pressure at the barrel holes draws the high pressure gasses at the boat evacuator.
Bore*
Boar = 🐗
I always wondered how those worked.
I always figured it had something to do with equalizing pressure, or possibly being a cooling mechanism to prevent the barrel from warping. It's so you don't choke. Huh.
I'm like 90% sure this is supereyepatch wolf. But I can't prove it.
Just seems like a catalytic converter.
_This just in, tanks around the US are found missing half of their barrels!_
A considerable amount of the barrel is actually inside the tank
I wouldn't call some... a considerable amount.
Most is breech and gun block
@@timharnans yes but because of the armour in the front of the turret you can’t put crew there so you have to move the gun back into the turret
@@draysoncrook4898 reloading the cannon outside the tank might also be a problem
that's why you should always measure from the butthole especially if it's cold outside.
My chicken nugget had bulges and forced a gas out of me
So that explains after the shot, smoke comes out of the nozzle as if its being pushed out.
It IS being pushed out.
the expelled gasses are in fact pulled out by way of vacuum when the gases exit the bore evac.
@chev2500hd1 From what i can see of this, the gases are pushed out, in much the same way you'd be pushed out (and not pulled or sucked out) an aeroplane window if it were to break.
@@castleanthrax1833 brother, do you know what the venturi effect is? the gasses are pulled out by way of vacuum. dont rely on this animation of the bore ecav in operation it is 100% incorrect
@@chev2500hd1 This is a simple equalisation of pressure. There is no constant mechanical force involved. The action of the shell creates a partial vacuum, and then the equalisation of pressure forces the remaining gases out of the barrel.
😂 not one single word to explain how the gasses escape better because of the bulge. Just banal descriptions. What concept is happening to evacuate the bore better? You literally say that atmospheric pressure can prevent gasses from exiting the bore, yet the bulge changes nothing about that, and expels gasses forwards exactly the same as if there were no bulge at all. Maybe this is explained properly in the full video, but this short needs to be deleted. Embarrassing from a channel I typically respect.
OwO, wus dis? (notices yo-... wait, what's with that smoke!?)
Fun fact: The first tank gun to feature bore evacuators is the British Royal Ordnance L7 which was designed in the late 50s! It was used on tanks like the Centurion, Leopard 1 and the M48 Patton.
The L7 wasn’t the first tank gun to use a bore evacuator.
@@Notreallysureactually then which was it?
@@fighter_750wasn’t D-10T2S on T-54A/B?
TANKS FOR THE MEMORIES!!!!!!!!!!!!!!!!!!!!!!!!!!!
Do the gases not shoot forward and escape out the barrel in front of the round as it travels through the chamber? I could see why this would evacuate pressure (assuming the pressure in the barrel is less than 1 atmosphere a moment after firing) but how does that not invalidate the pressure built up in the end half of the barrel, where accelerating the round is concerned? Just seems like something that would perform at its function better if it was closer to the end of the barrel, much like how a flow-through suppressor works on a rifle barrel to reduce back pressure and gases in the face of the shooter.
what is this awesome music your talking over?
I didnt know supereyepatchwolf did gun shorts now lol
Phenolic Impregnated Carbon Ablator
Always wondered about this. Now I know. 👍
It depends on which "ton" they mean. A small car weighs 1-2 tons. In the US, 1 ton = 2,000 lbs = 907 kgs.
Oh, good to know the reason for my Bulge
There are videos of MBTs firing their main guns on YT. If it has a bore evacuator, there will be a puff of smoke coming out of the barrel a second or two after the round leaves the gun. If you have ever wondered why that happens, it is the bore evacuator in action.
This is the my question I was asking about long time ago…..
are you evacuating your barrel of propellant gasses or are you just happy to see me?
So what it really is, is just a muffler
The buldge is there because the barrel is pregnant 😳😮😂
Imagine how insane this idea must’ve sounded
“What if we make it wider so that gas can get away from the projectile,and then have it get sucked out when it leaves the barrel”
Somebody had to picture fluid dynamics in order to come up with that idea, and then they had to put it in terms everybody can understand. Now that's genius!
i don't understand, why does everyone have tank and not me?
It’s the tanks catalytic converter
"Notices your bulg-"
💥
*notices your bore evacuator* uwu what's this
Thats why the abrams is part stalilinium steel.
Fun fact.....evacuators are not just for tanks
It’s like a Venturi effect. Genius.
Fix your speech impediment.
I think theyre just happy to see you :)
How come the barrel is smoothbore? Whats the advantage over a rifled barrel?
Modern ammunition, both anti-tank and high-explosive, usually contains stabilizing fins to keep the round on straight flight instead of rifling the barrel. As projectiles fly at faster and faster speeds, it takes more energy to spin the projectile so that it maintains stability. Moving to fin-stabilized rounds means more energy can be put into sending the round down-range instead of spinning it so it flies straight.
Some nations have been slow to adopt this. The 120mm guns the British use on their Challenger 2s have all been rifled because the HESH (High Explosive Squash Head) rounds they use are more effective when spinning. With the emergence of the Challenger 3, they are beginning to use smoothbores now.