Bronezhilet

Fiiiiiiiine, a picture:

On a sidenote, I recently (last week) discovered that one of the designs/developments I learned about during my time at the MoD isn't classified. 
 
So here's this:

A solid fuel ramjet in a 35x228mm round, Because why not?
 
I wish I took a photo of a round that was on display.
 
Yes I know it isn't exactly small arms, but oh well.

I'm reading Tom Clancy's Ryan universe in chronological order. Currently reading (read: slogging through) Executive Orders.

\
 

 

You've seen them before; poorly edited videos with an alternating loop of John Phillips Sousa and Weird Al, purporting to tell you about the various design mistakes armored fighting vehicle designers have made over the years:
 

 
But does the maker of these videos one Blacktail Defense, know shit about AFV design himself?
 
Haha, no, no he does not.
 
Because of Sturgeon's House strict hate-speech enforcement laws, I am compelled to mention that Blacktail Defense is a furry.  So know that should you click any of the links to his material, you will need to decontaminate yourself per protocol DG-12-23A with bleach.
 
Blacktail Defense is a military reformer, a storied and interesting political movement in the United States that has gone from being a force of some consequence to being a ragtag group of scoundrels.  I'm not going to say that they weren't idiots and scoundrels when they were of consequence, n.b.
 
Military reformers are at they're strongest when they're on the attack.  They're a lot like creationists that way; when they can hurl invective at (mostly imaginary) weaknesses within whatever it is they hate, they can look like concerned citizens campaigning for the taxpayer's right to have their money spent wisely and the soldier's right to have the best practical equipment.
 
But give a military reformer some lined paper and a slide rule and tell them to come up with a design, rather than tear down an existing one, and you will quickly see that these people have no idea what they're talking about.
 
Ready?
 

 
This is taken directly from Blacktail's furaffinity page.  Careful analysis shows that, no, this man has no idea what the everliving fuck he's talking about.
 
Are you ready?  No, you're not, but let's go ahead anyway.
 
"The Tigerwolf may look vaguely similar to contemporary MBTs, such as the ubiquitous M1-series Abrams, but is in fact wrapped around a lot of design features and technology that are comlpetely alien to today's tanks."
 
 
Blacktail is going to prove to you that he's a better tank designer than all those idiots at Chrysler by designing a tank using technologies that didn't exist at the time of the design of the Abrams.
 
"For starters the crew is quite large, with a Commander, Driver, Gunner, TWO loaders, and an Engineer. Many designers favor a smaller crew, usually adding an autoloader to eliminate the Loader from the crew (like in the Russian T-64 through 90, the French Leclerc, and the Chinese Type 85 through 99)."
 
 
... What?
 
"However, there are a lot of problems with a smaller crew. First, autoloaders work at a painfully slow pace (14 seconds to reload in a T-72), which gives manual-loading tanks a huge rate-of-fire advantage (just 4 seconds in the M1A1 Abrams)."
 
 

 
"There's no autoloader either, as that only slows the ROF, requires smaller, less powerful and versitile ammo to be used, adds another complex, delicate set of moving parts to break, and only serves to expand the guantlet  of things that can hurt you inside the vehicle.In fact, the Tigerwolf's main gun ammo is extremely large and heavy, and probably would break an autoloader --- it's would be an incredible feat of strength for a single Loader crewman to load in under 10 seconds."
 
 
The Leclerc uses the same ammunition as the Abrams and Leopard 2.  As for his 145mm smoothbore howitzer ammunition breaking an autoloader, does he not know that the Pz 2000 SPG has an autoloader for its 155mm gun?  Of course he doesn't know that; Blacktail doesn't know what he's talking about.
 
"The engineer is useful as well, because the large size of the Tigerwolf --- coupled with it's simple drivetrain (most modern tracked vehicles have a deceptively simple drivetrain) and small, flat engine (compred to a "Vee" or gas turbine) make for easy engine maintnance[sic] and repairs from inside the tank --- there's no need to abandon it if you lose a sparkplug while under small arms fire."
 
 
Simple drivetrains, eh?


 
Note that per the graphic, the Tigerwolf has a diesel wankel.  Does Blacktail not know that diesel engines don't have spark plugs?  Of course he doesn't know that; Blacktail doesn't know what he's talking about.

(Diesel wankels don't exist.  Three companies have tried making them; Rolls Royce, John Deere and some Japanese company I CBA to look up.  None of the three ever got them to mass production.  I'm not sure what the problem was.)
 
"As for the armor, instead of using a large amount of steel and other metals, most of the Tigerwolf's armor is made up of thick panels and blocks of woven fabric Carbon 60 and 70 --- which are genarically[sic] known as "Fullerine". [sic]
Fullerine has ove 100 times the tensile strength of steel, it's 10's of times lighter, and theoretically could be manufactured quickly and inexpensively. Essentially, the Tigerwolf has a sort of "Super Kevlar" armor, but unlike current Kevlars (which are made of polimers[sic] or composites), fullerine does not have a molecular structure that distorts or melts under heat or pressure --- a single piece of this new type of armor can withstand MANY direct hits from rounds with tank-killing power, KE and CE alike."
 
 
Ah yes, fullerenes; every hack futurist's favorite crutch.
 
Fullerenes have many interesting and useful properties, but their large-scale bulk mechanical properties may not be that amazing.  Many materials have amazing strength at small scales, but disappointing strength at macro scales.  Sapphire whiskers are an example.
 
Moreover, high tensile strength (which is what fullerenes have going for them), does not necessarily imply that a material will make good armor.  The properties that make materials effective against high-velocity threats are somewhat esoteric.  Aluminum alloys, for instance, have a better strength to weight ratio than does steel, and while several of them do protect better on a weight basis than steel against lower velocity threats like artillery fragments and small arms fire, suffer badly against high-velocity penetrators and HEAT threats due to sheer failure modes that only exist at those higher velocity ranges.
 
Also, why the fuck does Blacktail think that "Kevlars" melt under pressure?  Aramids don't melt.
 
"Even though it's much larger than an M1A1 Abrams, the Mk.75 Tigerwolf is over 30% lighter, and can swim over water obstacles, rather than slog though on the bottom. And because it floats, there are no depths that it cannot cross."
 
 
This is how big a 40 tonne boat is.
 
"Also important is it's low ground pressure, stemming from it's low 40-ton weight, super-wide tracks, low height, and enourmous horizontal size --- it has the ground pessure of a "Light Track" vehicle, like the M113 Gavin. This is important because almost half the world's surface is closed to heavy tracks (again, the M1A1 Abrams), due to thier height, ground pressure, and high centers of gravity.
The Tigerwolf can directly cut across many areas that no existing or projected MBT will ever be able to --- not to mention traverse certain terrain features, such as bridges and paved roads, without damaging them."
 
 
Is Blacktail under the impression that it's ground pressure that damages bridges?  Jesus, if that were true the last thing you'd want to get anywhere near a bridge is a car.
 
"As the Tigerwolf has 40% more power and torque than the M1, and weighs 30% less, it is 40% faster and could probably accelerate as quickly as a Humvee. This would make contemporary tanks very hard-pressed to cut-off a Tigerwolf, and no current or projected tanks could ever hope to pursue a Tigerwolf.
Other advantages offered by the powerpack include a small number of moving parts, extremely low vibration and ocillation (inherent to Wankel Rotaries; not in piston engines), low heat emissions (less than in 700+ degree piston engines, or 1500+ degrees in Gas Turbines), a very small, flat, light engine block, and stonger individual components than in any current or projected tank engine, and a 5-speed AT, to take advantage of the high engine output. "
 
 
Uh huh...
 
So this is a magical wank(el) engine that has equal SFC to a diesel, rather than falling between a diesel and a turbine as existing ones do.
 
"Other advantages offered by the powerpack include a small number of moving parts, extremely low vibration and ocillation (inherent to Wankel Rotaries; not in piston engines), low heat emissions (less than in 700+ degree piston engines, or 1500+ degrees in Gas Turbines), a very small, flat, light engine block, and stonger individual components than in any current or projected tank engine, and a 5-speed AT, to take advantage of the high engine output."
 
 
WHAT THE FUCK KIND OF TURBINE REJECTS HEAT AT 1,500 DEGREES?!  The highest turbine inlet temperature on record is 1,600C!
 
Per Honeywell, AGT-1500's exhaust temperature is 500 C, but it's unclear if that is before or after it enters the recuperator.
 
And if he's using bullshit Imperial units he's still wrong.
 
If you don't know the difference between heat rejection temperature and turbine inlet temperature, you have no business discussing turbines.
 
"All tanks require high firepower, and the Mk.75 Tigerwolf has plenty of it. The large size of the Tigerwolf's hull and turret enables a heavier-caliber howitzer to be used than on any tank currently in service --- a 145mm Smooth-Bore Howitzer. Because the German-designed M256 120mm smoothbore (M1A1, M1A2, Leopard 2, etc.) has a 40% larger punch than the British-designed M67 105mm Rifled-bore (the standard to which ALL other tank guns are judged --- used on too many tanks to list), the Tigerwolf's gun probaly has at least 20% more punch than the M256 --- enough to outrange any of today's tank guns, with enough penetration to destroy an M1A1 from well beyond it's maximum gun range."
 
 
Any fictional Main Battle Wank needs to have a smitey, terrifying weapon... I'm not sure why Blacktail has saddled his design with a howitzer.
 
Also, how many places on Earth are there where you can even see further than the engagement range of an M1's armament?
 
"The Co-Axial MachineGun (COAX) fires 7x50mm rifle rounds, which combine the low cost and recoil of the 5.56x45mm NATO round, with the accuracy and penetration of the 7.62x51mm NATO round. 7mm rounds would also have a smaller casing daimeter than a 7.62mm round, which when coupled with significantly larger magazines and canisters, means the Tigerwolf totes one hell of a lot of MG ammo. As such, it is unlikely that a Tigerwolf will have to resupply MG ammo during a battle, and may even have thousands of rounds to spare --- if it is supporting friendly troops, the Tigerwolf may be able to spare a few thousand rounds for them."
 
 
Someone doesn't know the difference between case head diameter and caliber.
 
"A smooth ride and steady aim are achieved through hydropneumatic suspension and stabilization (versus the comparatively rougher torsion and hydraulics used in current and projected tanks) . The gun, turret, and hull each have thier own stabilization. While each of these are mechanically independant, they are balanced and co-ordinated via computer (which also feeds stability data to the gunnery computer, adjusting the GPS crosshairs in real time). This is unlike current tanks, whose ballistics comuters only react indirectly to the actual stability of the vehicle."
 
 
I don't know what any of this means, except that Blacktail doesn't know how suspension and stabilization work.
 
 
That's all I can stand.  I'm done.  Go read it if you want to, or not, whatever.

Colli, it looks like you might be wrong.
 
I did some checks on how the detonation wave travels through a block of PETN. The shock front has a pressure of  ~25000000 kPa, or 250000 bar (that's 3.6 MILLION PSI for you imperialist bastards).

I know that ERA isn't mounted directly onto the armour, but oh well. Sidenote: I made a hole in the flyer plate, which makes no sense in a 2D simulation. The plate would fly straight forward irl.
 
When the shock front hits the armour, it rebounds, creating a pretty nasty pressure spike of ~53000000 kpa, or 530000 bar (7.7 MILLION PSI).

 
This all happens in ~0.006 ms, or 6 microseconds.
 
After ~0.009 ms, or 9 microseconds:

 
And when you wait a really really really long time, like 0.04 ms, or 40 microseconds, pressures drop to more acceptable levels:

 
The shock front is gone, but a high pressure area stays. Max pressure is 7400000 kpa, or 7400 bar (~107000 PSI). Pressures are dropping very very quickly at this point. In 0.003 ms, or 3 microseconds, pressure has dropped by 2000000 kPa, or 2000 bar (~30000 PSI).
 
I think the forward charge is indeed intended to set off the ERA blocks. Not to get the blocks out of the way, but to prevent a collision between the main jet and the shock front moving at ~7 km/s. I can totally see an ultra-high pressure front moving at hypersonic speeds screwing up a HEAT jet.
 
Edit: I don't know what the detonation speeds of the explosive compounds in the most common ERA blocks are, they're probably slower than 7 km/s.

Yes.

Above test was an inert reactive armor test, an explosive reactive armour test gave this result:

(part B is the same as "t = 30 microseconds" in the first picture)
 
Interesting to note that the first ~5 cm of the jet in the inert test isn't damaged, but is in the explosive test. Is it because it had to pass through a shock front, or something else?
 
This is also interesting:

Yes.

Above test was an inert reactive armor test, an explosive reactive armour test gave this result:

(part B is the same as "t = 30 microseconds" in the first picture)
 
Interesting to note that the first ~5 cm of the jet in the inert test isn't damaged, but is in the explosive test. Is it because it had to pass through a shock front, or something else?
 
This is also interesting:

Colli, it looks like you might be wrong.
 
I did some checks on how the detonation wave travels through a block of PETN. The shock front has a pressure of  ~25000000 kPa, or 250000 bar (that's 3.6 MILLION PSI for you imperialist bastards).

I know that ERA isn't mounted directly onto the armour, but oh well. Sidenote: I made a hole in the flyer plate, which makes no sense in a 2D simulation. The plate would fly straight forward irl.
 
When the shock front hits the armour, it rebounds, creating a pretty nasty pressure spike of ~53000000 kpa, or 530000 bar (7.7 MILLION PSI).

 
This all happens in ~0.006 ms, or 6 microseconds.
 
After ~0.009 ms, or 9 microseconds:

 
And when you wait a really really really long time, like 0.04 ms, or 40 microseconds, pressures drop to more acceptable levels:

 
The shock front is gone, but a high pressure area stays. Max pressure is 7400000 kpa, or 7400 bar (~107000 PSI). Pressures are dropping very very quickly at this point. In 0.003 ms, or 3 microseconds, pressure has dropped by 2000000 kPa, or 2000 bar (~30000 PSI).
 
I think the forward charge is indeed intended to set off the ERA blocks. Not to get the blocks out of the way, but to prevent a collision between the main jet and the shock front moving at ~7 km/s. I can totally see an ultra-high pressure front moving at hypersonic speeds screwing up a HEAT jet.
 
Edit: I don't know what the detonation speeds of the explosive compounds in the most common ERA blocks are, they're probably slower than 7 km/s.

Colli, it looks like you might be wrong.
 
I did some checks on how the detonation wave travels through a block of PETN. The shock front has a pressure of  ~25000000 kPa, or 250000 bar (that's 3.6 MILLION PSI for you imperialist bastards).

I know that ERA isn't mounted directly onto the armour, but oh well. Sidenote: I made a hole in the flyer plate, which makes no sense in a 2D simulation. The plate would fly straight forward irl.
 
When the shock front hits the armour, it rebounds, creating a pretty nasty pressure spike of ~53000000 kpa, or 530000 bar (7.7 MILLION PSI).

 
This all happens in ~0.006 ms, or 6 microseconds.
 
After ~0.009 ms, or 9 microseconds:

 
And when you wait a really really really long time, like 0.04 ms, or 40 microseconds, pressures drop to more acceptable levels:

 
The shock front is gone, but a high pressure area stays. Max pressure is 7400000 kpa, or 7400 bar (~107000 PSI). Pressures are dropping very very quickly at this point. In 0.003 ms, or 3 microseconds, pressure has dropped by 2000000 kPa, or 2000 bar (~30000 PSI).
 
I think the forward charge is indeed intended to set off the ERA blocks. Not to get the blocks out of the way, but to prevent a collision between the main jet and the shock front moving at ~7 km/s. I can totally see an ultra-high pressure front moving at hypersonic speeds screwing up a HEAT jet.
 
Edit: I don't know what the detonation speeds of the explosive compounds in the most common ERA blocks are, they're probably slower than 7 km/s.

Colli, it looks like you might be wrong.
 
I did some checks on how the detonation wave travels through a block of PETN. The shock front has a pressure of  ~25000000 kPa, or 250000 bar (that's 3.6 MILLION PSI for you imperialist bastards).

I know that ERA isn't mounted directly onto the armour, but oh well. Sidenote: I made a hole in the flyer plate, which makes no sense in a 2D simulation. The plate would fly straight forward irl.
 
When the shock front hits the armour, it rebounds, creating a pretty nasty pressure spike of ~53000000 kpa, or 530000 bar (7.7 MILLION PSI).

 
This all happens in ~0.006 ms, or 6 microseconds.
 
After ~0.009 ms, or 9 microseconds:

 
And when you wait a really really really long time, like 0.04 ms, or 40 microseconds, pressures drop to more acceptable levels:

 
The shock front is gone, but a high pressure area stays. Max pressure is 7400000 kpa, or 7400 bar (~107000 PSI). Pressures are dropping very very quickly at this point. In 0.003 ms, or 3 microseconds, pressure has dropped by 2000000 kPa, or 2000 bar (~30000 PSI).
 
I think the forward charge is indeed intended to set off the ERA blocks. Not to get the blocks out of the way, but to prevent a collision between the main jet and the shock front moving at ~7 km/s. I can totally see an ultra-high pressure front moving at hypersonic speeds screwing up a HEAT jet.
 
Edit: I don't know what the detonation speeds of the explosive compounds in the most common ERA blocks are, they're probably slower than 7 km/s.

Thanks for the info Bronezhilet, the article was corrected with your information.

This is not correct. A shape stabilised projectile is not as aerodynamic as a projectile with a cone/ogive nose. In the comparison simulations I did, a shape stabilising nose has about 20% more drag than an ogive nose. Now, I don't have either a 3D model of the 3BK-15 or the shell it replaced so I can't do an accurate comparison. But a shape stabilising nose cannot, to the best of my knowledge, be more aerodynamic than an ogive nose.
 
As for the second part, here's how the stabilising actually works

On this note, the B-25/PBJ variants with the 75mm. It was basically the Sherman's gun, handloaded just like in the tank, and it was apparently pretty much impossible to hit anything with it.    I read a story from a crew member about how they basically considered it dead weight, and would rely on the .50s instead, only firing the 75mm for the hell of it once in a while. He said that the one time they managed to hit a target with it (a ship of some sort), their first reaction was shock, followed by an instinct not to tell anybody about it for fear that the brass might think that the cannon was a good idea.

They're doppler radar units. Generally used as an Mv radar or as a long range tracking radar.
 
The Mv radars are pretty small:

(Spot the transmitter)
 
But the long range tracking radars are slightly bigger:


 
Source for last picture: http://www.dtic.mil/get-tr-doc/pdf?AD=ADA440351

Pretty much what it says on the tin. These are time to kill charts for tier X tanks with a primary focus on different guns, rather than different tanks. All reload times are based on the stated rate of fire of the gun: Vents, rammer, BIA, or crew skill level are not factored in to these graphs. All times where started on the first shot, because it is assumed that a tank will not go into an engagement without being loaded.
 
 
For the heavies, I tried to take tanks that had similar DPM because the 120mm and 122mm guns can have middle of the road medium tank levels of DPM on certain tanks, and I felt that this would not make a good comparison. This is why I selected the T110E5 and IS-4 instead of the FV215b and 113. This is also more representative of tanks that one would encounter, considering the popularity of the E5 and IS-4 compared to the FV215b and 113.
 

 
For autoloaders, I used only heavy and medium tanks. This was mostly to reduce the clutter, and because TD's and arty have substantially different play styles.

It turns out that all tier X medium tanks really only mount one of three guns; the L7, the U-8TS/D-54, and a single example of and M62 clone on the 121. So for comparison, I tended to higher DPM mediums because I could find examples of each gun that were fairly close to each other. This was mainly determined by the U-8TS, because it has consistently high DPM among all tanks that carry it. There is an exception now with the T-22SR, however tank is so rare that it is hardly ever encountered in public matches. Also, tier X medium tank DPM is substantially divergent (~500) among tanks that are armed with the L7 or clones thereof.

That feels when your Зверобой 1-hit-kills a full-health Panther.


 
152 best millimeters of all years
 
OH MY GOD THE SU-152 HAS TURNED ME INTO TIED

OK, we can stop using the word "cuck" so damned much, sheesh. Starting to sound like an MRA forum in here...

Natnaniel's posts have been attracting the gun guy knuckle draggers for sure as of late.

This is for posting interesting Historical photos/art/articles about the particular day you are posting. Example, on December 7, Pearl Harbor attack related stuff would probably get posted.  14th of October, maybe an image of the battle of Hastings.  With the broad perspectives on the board, I'm hoping to see and learn some interesting stuff over time.