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Sturgeon's House


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Posts posted by N-L-M

  1. In the Challenger 2, much like the Chieftain and Challenger 1, the ammo in the hull is stowed all over the place, but the 3 main bins of vertical propellant charges, if removed, provide adequate space for storing unitary ammo horizontally. Likewise, the frontal hull propellant racks, when removed, provide some more space there, though that likely requires rejiggering of the rest of the internal components there, as the unitary 120 is much longer. Perhaps that area wasn't touched, and the 15 are stowed horizontally where the 3 main bins were, nose to nose from 2 sides.
    Such an arrangement would also make them fairly accessible to the loader, somewhat making up for the low overall load.

  2. Well, it's worth noting that a Stryker has a 2 man crew. Pretty sure the Dragoon likewise. Counting the commander as one of the dismounts is a thing you can do fairly easily with a remote turret, if you're willing to have the gunner step in as commander as well when the commander dismounts for an assault.

    Most tank operators' doctrine provide for fighting a tank undermanned in case of casualties, this wouldn't be too different.

    For maintenance of an IFV, you have the whole dismount squad to call on for help.

    Big question then is where is the commander more useful- staying inside commanding the IFV or with the dismounts on the assault.

    Or perhaps it'll be left to his discretion.

  3. From: Mahapya Smith, Chief Engineer, SCHV department

    To: Caliber Selection Committee, Rapid City Union Ammunition Plant

    Enclosed is the final TDP for the new proposed round, 0.22 Rapier.
    Following the Committee's advice, certain dimensions have been altered, to allow good growth margins, ease of manufacture, and low weight and cost, thus ensuring that this small but deadly bullet may best serve the needs of the scouts. Case head thicknesses have been reduced, as has case length, and the shoulder angle has increased to 25 degrees.
    Following extensive field trials (see enclosed report), it has been decided to electrically bond the bullet core to the jacket. This advanced technological process ensures the best performance can be attained out of small bore bullets.
    I and my faithful assistants, as the department, look forwards to your acceptance of this design; Initial batches have already been produced and tooling acquired for mass production, paid out of department funds.


    From the personal diary of Mahpiya Smith

     When this RFP first came out, I was highly suspicious. While it's a common joke that nobody from the main offices would be caught dead in the "pest control" SCHV department, it appears to actually be true. For the past 4 years since I got the job of running the place (and it does get awfully lonely here sometimes), I have not seen anyone from the company other than the occasional runner. Were it not for the regular paychecks and occasional company-wide memos, one might even think I was shunted into a dead end job with no authority (or indeed employees), where the management can keep me out of both sight and mind. This RFP seemed tailor-made to be the final nail in my career's coffin. I must either submit a design, lose, and thereby lose my job, or fail to submit, be seen as useless, and again lose my job. In either case, the prospects are dim. A lone solution presented itself - deliver a nominally competitive design, but at minimal cost, while reporting moderate expenses. This approach means my pension fund will be, if not undamaged by my firing, at least strongly and creatively augmented. My totally-real-they-just-aren't-in-today assistants hired from the development budget, Gladys and Fred, have also aided the cause of moving project funds to where they actually belong.
    Today I sent in the final draft. It'll take them a week to select a winner, another to write me a sufficiently patronizing letter of termination, and at least one more week to send in the wreckers to clear out the department shack and reclaim the tooling. By the time they get here, I should be long gone.

  4. The SCHV shill department of Black Hills is proud to present the .22 Rapier!


    Featuring a .224, 83 grain copper-washed steel jacketed bullet, a steel case, and enough powder to sent said bullet downrange at above 2900 fps, this cartridge is the ideal choice for scouts.
    by the wisdom instilled from the studying of the works of the ancients, our chief Shaman was blessed with a revelation - once a bullet is in flight, it may not gain energy, only lose it. Therefore, it makes no sense to choose any bullet shape but that which experiences the least drag, and as such a boat tailed  Von Karman ogive bullet approximately 6 calibers long was chosen.
    In order not to consume any expensive copper, and considering the low expected lifetime ammunition throughput of any individual Scout rifle, mild steel (copper washed) was chosen as the prime working material, except the lead core.

    The performance, while not outstanding in the criteria measured, is acceptable; where the cartridge really shines is cost, both monetary and weight - with a cost of merely 4.56 C a round, its a steel steal, and the overall weight of 220.5 gr means it is approximately 40% lighter than the historic 7.62 NATO and equivalents in current service, thus allowing to greatly reduce the burden carried by Scouts without compromising their mission effectiveness; and, should they need their weapons, they may rest assured that their bullet  is accurate (exceeds drift and drop specifications), powerful (exceeds energy and penetration specs) and quick (exceeds recoil requirements by a factor of 3). 
    Not only do the Scouts get a round which on a 1:1 basis exceeds current issue on every parameter, they get a ratio better than 1:1! with a rim diameter of 0.4", the round may de stacked in a double column of 24 rounds without exceeding the 5" stack limit imposed by maximal magazine dimensions, an improvement of 20% over that requested.


    The round also features growth potential; the large bullet and generous ogive space mean plenty of room for other loadings, and the steel case provides growth capacity to more pressure resistant (if more expensive) brass cases for specialty loads.


    In short, this round presents all that's best in pre-war small arms ballistics, providing a good answer to the needs of the scouts of today, tomorrow, and perhaps also the day after.



    Reduced velocity:



    Full velocity:




  5. Considering how they were busy displacing Centurions and Pattons in service, where would they get all those hull parts from? It's not like they had several hundred merkava hull noses just lying around, or several hundred merk 2s to chop up. And that's if we assume the nose is 100% compatible, which it probably isn't. Why would one assume they're identical? The first roadwheel arm hub on the Merk 3 and 4 is right below the final drive base, which appears to be part of the hull nose, and therefore must come as part of the nose.


    Namer nose, but the point stands.


    On the Merk 2 you don't have those, as it has the bogies which of course sit further back on the hull.


    Most reasonable assumption is that they decided to go cast on the Merk 3 when they started cause it's what they knew worked, and later switched to a welded design for whatever reason.

  6. 1 hour ago, Wiedzmin said:

    or part of Mk.3 was builded on Mk.2 hulls ?

    Simply not possible, the whole rear section of the hull is different, as are the hull sides.

    By the look of things, at some point in Merk 3 production they switched from the rounded, presumably cast hull nose to the sharp, presumably welded one.

    I don't recall seeing any pictures of Ramaqh Mk3 with a sharp hull but there are Baz Mk3s with either.

  7. So, a bit older than most of the things in this thread, but @Sturgeon and I noticed something while crunching numbers for the current competition-
    If you take the 0 degree penetration of the 90mm HVAP and compare it to APDS, you get that it substantially over-performs according to the Demarre equation. Far beyond what you'd expect as reasonable error from Demarre. A possible explanation occurred to us- The HVAP has a heavy steel base, which on normal impact strikes the core from the rear like a hammer driving a nail, thus substantially raising its effective sectional energy.



    This explanation also goes a long way to explain why it is that HVAP suffers so badly from sloped armor, much more than any other AP ammo type- much like trying to drive a nail at an angle, it skips rather than go in.

  8. So I booted up the Norman model. Turns out that thanks to the needlenose shape and being specced for the wide frontal arc, from directly ahead the Norman's cheeks are hilariously thick:

    of course the center of the needlenose, where the mantlet is, is significantly more sane.



    cheek section at 30 degrees to the right



    Section at the mantlet.



    The Norman is a really tough nut.

  9. On 4/2/2020 at 2:17 PM, Serge said:


    No, definitely a 1 or 2.

    The merkava 3, 4, and Namer have individual swing arms, the mounts for which are these large bases built into the hull side. The lack of such mounts means it must be a Merk 1 or 2, where the arms are attached to the bogies which are mounted to the hull.


    This is a Namer hull, but the idea is the same. There are a few pics of merkava 3s with the swing arm ripped off where you can see it more clearly but my Google fu is weak.

    In the pic posted earlier there's no sign of these swing arm hub bases.

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