Alternative History Armoured Fighting Vehicles Part 3

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I don't think the 76 had a very good HE shell. Useful enough against bunkers, but ot against field fortifications. For Vietnam: I wonder if they'd develop a Beehive round for it?

Unrelated point: moving the thread to Post-1900 seems to have been a great success.
The background story was an afterthought, let's say they had a variant with flamethrower for pillboxes.
I'll draw one up later.
 
That's the one - I couldn't find an image. The Tank Museum director has good comments on it in a Bottom 5 Tanks video.
The A33 (especially the 2nd prototype) did perform well in testing. A 3rd prototype was even scheduled with 6" of frontal armor and a Comet turret, with the possibility to get a 66" turret ring and a new turret. The fundamental problem is that it would enter service late in 1944 like the Comet, which makes it problematic when the priority is to churn out the now decent Churchill VIIs. Too late.

At best the proposed 17pdr evolutions of A33 could have covered the infantry tank role instead of the Centurion-derived A45 while appearing somewhat earlier so we might see prototypes/pre-prod in 1945. In that case they might compete with Centurion regarding what platform evolves into the Universal tank.
 
Probably a dead end, given the speed.
It was severely underpowered. The Churchill itself was underpowered but it's superior gearbox saved it. The Churchill was considered a failure in it's early versions and it had to be completely rebuilt after the Mk.III version, producing the Mk.IV and the AVRE which saved it. The Churchill could climb hills like a goat apparently, appearing where it wasn't possible for most tanks to appear on a battlefield...
 
I have an idea for a recoilless armed light tank with a rotation reloading mechanism. Most probably a 120mm Rheinmetall frangible base system like the WOMBAT Rcl. The American system with all it's frangible ports along the length of the shell makes it an unnecessarily complicated reloading system with the barrel having to travel forward for the spent round to reloaded. The Rheinmetall system with it's frangible base is much simpler and can use a revolving chamber. I would base it one the AMX-13 oscillating turret with a large reserve of shells in the space behind it. It's venturi would be angled upwards slightly to protect any infantry behind it. It would have been very useful in Vietnam. Anybody care to give a diagram a try?

Any particular hull you want this based on? If we are talking Vietnam, then the ubiquitous M113 might be a good starter but you might also consider the M41 or M551 Sheridan. As a Fire Support Vehicle, the M113 offers greater potential for ammunition storage and some sort of rotary magazine that dips into the hull for easy reload...

Just the AMX-13 would do. The M113 would be too tall to fit in a C-130 with an oscillating turret on top of it.

A shameless extract from Wiki states the following about recoilless rifles:

A recoilless rifle, recoilless launcher or recoilless gun, sometimes abbreviated "RR" or "RCL" (for ReCoilLess) is a type of lightweight artillery system or man-portable launcher that is designed to eject some form of counter-mass such as propellant gas from the rear of the weapon at the moment of firing, creating forward thrust that counteracts most of the weapon's recoil. This allows for the elimination of much of the heavy and bulky recoil-counteracting equipment of a conventional cannon as well as a thinner-walled barrel, and thus the launch of a relatively large projectile from a platform that would not be capable of handling the weight or recoil of a conventional gun of the same size. Technically, only devices that use spin-stabilized projectiles fired from a rifled barrel are recoilless rifles, while smoothbore variants (which can be fin-stabilized or unstabilised) are recoilless guns. This distinction is often lost, and both are often called recoilless rifles.

Because some projectile velocity is inevitably lost to the recoil compensation, recoilless rifles tend to have inferior range to traditional cannon, although with a far greater ease of transport, making them popular with paratroop, mountain warfare and special forces units, where portability is of particular concern, as well as with some light infantry and infantry fire support units. The greatly diminished recoil allows for devices that can be carried by individual infantrymen: heavier recoilless rifles are mounted on light tripods, wheeled light carriages, or small vehicles, and intended to be carried by crew of two to five. The largest versions retain enough bulk and recoil to be restricted to a towed mount or relatively heavy vehicle, but are still much lighter and more portable than cannon of the same scale. Such large systems have mostly been replaced by guided anti-tank missiles in first-world armies.

There are a number of principles under which a recoilless gun can operate, all involving the ejection of some kind of counter-mass from the rear of the gun tube to offset the force of the projectile being fired forward. The most common system involves venting some portion of the weapon's propellant gas to the rear of the tube, in the same fashion as a rocket launcher. This creates a forward directed momentum which is nearly equal to the rearward momentum (recoil) imparted to the system by accelerating the projectile. The balance thus created does not leave much momentum to be imparted to the weapon's mounting or the gunner in the form of felt recoil. Since recoil has been mostly negated, a heavy and complex recoil damping mechanism is not necessary. Despite the name, it is rare for the forces to completely balance, and real-world recoilless rifles do recoil noticeably (with varying degrees of severity). Recoilless rifles will not function correctly if the venting system is damaged, blocked, or poorly maintained: in this state, the recoil-damping effect can be reduced or lost altogether, leading to dangerously powerful recoil. Conversely, if a projectile becomes lodged in the barrel for any reason, the entire weapon will be forced forward.

Since venting propellant gases to the rear can be dangerous in confined spaces, some recoilless guns use a combination of a counter-shot and captive piston propelling cartridge design to avoid both recoil and backblast. The Armbrust "cartridge," for example, contains the propellant charge inside a double-ended piston assembly, with the projectile in front, and an equal counter-mass of shredded plastic to the rear. On firing, the propellant expands rapidly, pushing the pistons outward. This pushes the projectile forwards towards the target and the counter-mass backwards providing the recoilless effect. The shredded plastic counter-mass is quickly slowed by air resistance and is harmless at a distance more than a few feet from the rear of the barrel. The two ends of the piston assembly are captured at the ends of the barrel, by which point the propellant gas has expanded and cooled enough that there is no threat of explosion. Other counter-mass materials that have been used include inert powders and liquids.


In other words, recoilless rifles were great for infantry in the days before small AT missiles but really a bit of a waste of time, range and efficiency for an AFVs other than that a larger calibre round could be fire and a certain saving in all up weight. Furthermore, I'm not sure I would wish to crew a tank that advertised itself like Krakatoa every time it fired!

All that said, here is my take on what was asked for. I have left the basic stripped-down WOMBAT 120mm barrel to give you an idea of size...

AMX-13 120mm.png
 
Well colour me excited.

In saying that an evolved Ferret has my interest as I've always wanted to see a NATO equivalent of the BRDM 2. Which I thought would be an evolved Gage Cadillac Commando, but a bigger Ferret would be nice too.
 
Thanks mate. I've also been doing a pile of very unique stuff for @roderickgibsono for his TL. No spoilers though as he wants to wait until his TL is more mature/finished...

Now someone mentioned a tracked Ferret. I do hope they were talking about the little scout car... 🤨🤪
We are really lucky that you are here.

Speaking of TLs.

I tried a Mussolini when I started.

I tried doing episodic (as many did seemingly here) but the constructive criticism made me realize I am not an episodic type of writer.

I am one who enjoys writing fiction that is soft on details but at least it makes sense from at least on a surface level...which the Mussolini TL DID NOT HAVE.

So, that one is paused for the time being and I am getting closer to OTL future so to speak. Basic premise : Imagine 20 minutes into the future trope but cut down to a quarter so 5 minutes.

And at least I don't have to LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOTSSSSSSS OF RESEARCH. Which thankfully soft next future fiction doesn't need that much.
 
Well colour me excited.

In saying that an evolved Ferret has my interest as I've always wanted to see a NATO equivalent of the BRDM 2. Which I thought would be an evolved Gage Cadillac Commando, but a bigger Ferret would be nice too.

🤣 Crayons at the ready! 🤣

Of course, a truly evolved Ferret would be the Fox - not really a BRDM 2 but getting there in a top heavy-unstable-deathtrap sort of way!!! 😲
 
OK, that would be more than adequate to support infantry operations in South Vietnam in the 1960s, although I would prefer the barrel to be slightly longer and the bustle a little larger, with a flashing light behind an armoured grill to alert anybody supporting it to be aware when it was about to fire. Overall, it needs to be airtransportable and small enough to be easily ensconced inside a C-130.
 
A shameless extract from Wiki states the following about recoilless rifles:

A recoilless rifle, recoilless launcher or recoilless gun, sometimes abbreviated "RR" or "RCL" (for ReCoilLess) is a type of lightweight artillery system or man-portable launcher that is designed to eject some form of counter-mass such as propellant gas from the rear of the weapon at the moment of firing, creating forward thrust that counteracts most of the weapon's recoil. This allows for the elimination of much of the heavy and bulky recoil-counteracting equipment of a conventional cannon as well as a thinner-walled barrel, and thus the launch of a relatively large projectile from a platform that would not be capable of handling the weight or recoil of a conventional gun of the same size. Technically, only devices that use spin-stabilized projectiles fired from a rifled barrel are recoilless rifles, while smoothbore variants (which can be fin-stabilized or unstabilised) are recoilless guns. This distinction is often lost, and both are often called recoilless rifles.

Because some projectile velocity is inevitably lost to the recoil compensation, recoilless rifles tend to have inferior range to traditional cannon, although with a far greater ease of transport, making them popular with paratroop, mountain warfare and special forces units, where portability is of particular concern, as well as with some light infantry and infantry fire support units. The greatly diminished recoil allows for devices that can be carried by individual infantrymen: heavier recoilless rifles are mounted on light tripods, wheeled light carriages, or small vehicles, and intended to be carried by crew of two to five. The largest versions retain enough bulk and recoil to be restricted to a towed mount or relatively heavy vehicle, but are still much lighter and more portable than cannon of the same scale. Such large systems have mostly been replaced by guided anti-tank missiles in first-world armies.

There are a number of principles under which a recoilless gun can operate, all involving the ejection of some kind of counter-mass from the rear of the gun tube to offset the force of the projectile being fired forward. The most common system involves venting some portion of the weapon's propellant gas to the rear of the tube, in the same fashion as a rocket launcher. This creates a forward directed momentum which is nearly equal to the rearward momentum (recoil) imparted to the system by accelerating the projectile. The balance thus created does not leave much momentum to be imparted to the weapon's mounting or the gunner in the form of felt recoil. Since recoil has been mostly negated, a heavy and complex recoil damping mechanism is not necessary. Despite the name, it is rare for the forces to completely balance, and real-world recoilless rifles do recoil noticeably (with varying degrees of severity). Recoilless rifles will not function correctly if the venting system is damaged, blocked, or poorly maintained: in this state, the recoil-damping effect can be reduced or lost altogether, leading to dangerously powerful recoil. Conversely, if a projectile becomes lodged in the barrel for any reason, the entire weapon will be forced forward.

Since venting propellant gases to the rear can be dangerous in confined spaces, some recoilless guns use a combination of a counter-shot and captive piston propelling cartridge design to avoid both recoil and backblast. The Armbrust "cartridge," for example, contains the propellant charge inside a double-ended piston assembly, with the projectile in front, and an equal counter-mass of shredded plastic to the rear. On firing, the propellant expands rapidly, pushing the pistons outward. This pushes the projectile forwards towards the target and the counter-mass backwards providing the recoilless effect. The shredded plastic counter-mass is quickly slowed by air resistance and is harmless at a distance more than a few feet from the rear of the barrel. The two ends of the piston assembly are captured at the ends of the barrel, by which point the propellant gas has expanded and cooled enough that there is no threat of explosion. Other counter-mass materials that have been used include inert powders and liquids.


In other words, recoilless rifles were great for infantry in the days before small AT missiles but really a bit of a waste of time, range and efficiency for an AFVs other than that a larger calibre round could be fire and a certain saving in all up weight. Furthermore, I'm not sure I would wish to crew a tank that advertised itself like Krakatoa every time it fired!

All that said, here is my take on what was asked for. I have left the basic stripped-down WOMBAT 120mm barrel to give you an idea of size...

View attachment 715420
Very interesting. Gonna have to stea... borrow this idea. ;) :openedeyewink: XD
 
Was the Black Prince (Churchill with a 17pdr) a good tank or an evolutionary dead end?

The Black Prince may have looked superficially similar to a Churchill but it was significantly bigger - not a Churchill! Yes, compared to the Centurion it was an evolutionary dead end.
 
I don't think the 76 had a very good HE shell. Useful enough against bunkers, but not against field fortifications. For Vietnam: I wonder if they'd develop a Beehive round for it?
The background story was an afterthought, let's say they had a variant with flamethrower for pillboxes.
I'll draw one up later.
M25 Beauregard F.T..png

M25 flame thrower tank in Vietnam 1966, nicknamed "Little Godzilla" by US troops.
 
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