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Lord_James

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  1. Lord_James
    Didn’t the Tirpitz prove that?
  2. Lord_James
    Well no, but for the reason the M1A2 uses a bigger turret than the original M1. As for the titanium, I don’t think they replaced the steel structure with titanium; that would be expensive as hell, but they may have replaced non structural steel armor with titanium.
  3. Lord_James
    Update on the SH-1T: Mock-up of turret Extended sponsons gun created (and roughly placed within turret) weight thus far is 48.27 Mg; length is 10.74m from barrel tip to rear storage; autoloader can fit 24 155mm x 800mm shells, but I designed it for 900mm long shells, so might fit 22 or so. Turret Armor Cavities: Front: 45mm RHA + 515mm array + 90mm JPA at 30o. 751mm LoS from dead front. Front Sides: 45mm RHA + 255mm array + 63mm JPA. At 45o, LoS is 513mm (covers turret crew up to 60o). Rear Sides: 35mm RHA + 101.5mm array + 45mm RHA. 257mm LoS at 45o. Gun is the 155mm C4B Mod.3 naval cannon. The B version of the C4(x) is an L/44 (C4A is a L/52), and the Mod.3 is modified for army use. It has a bayonet locked barrel for quick changing, and can fire up to 900mm long projectiles, but the chamber is limited to 800mm long propellant charges. Operates at 61,000 psi (421 MPa) and has a 500mm recoil stroke. Crew is estimated at 5: Driver Loader Gunner Commander Ordinance operator / Assistant loader (I plan to add a remote 107mm mortar, which this crewperson would use) I found that I can increase head room / lower the floor if I remove the 6th pair of road wheels, revise the floor armor, and drop the autoloader into the space. Should give back ~100mm. To do: H. Mantle armor I. Add spaces for stuff to go into sponsons J. The engine and transmission K. Turret roof armor L. Additional weapons (coax, 107mm mortar, commander armament, etc.)
  4. Lord_James
    What is it?
  5. Lord_James
    More picks of the SH-1T, now with road wheels and 2 new armor cavities! Weight is up to 35.86 Mg, with the suspension and wheels taking up 8.6 Mg by themselves (steel torsion bars with 850mm diameter aluminum wheels). New Armor cavities: 6. Engine Compartment Roof: 30mm RHA + 60mm array + 30mm JPA at 7o. 992mm LoS 7. Crew Compartment Roof: 25mm RHA + light NERA + 36mm JPA. might reverse angle the NERA or change the material, as I'm getting disappointingly low numbers for roof protection. I also raised the crew compartment floor, so no one can trip over the autoloader, though this reduces the head room from 1.45m to 1.26m. near future: A. mock up turret and carousel loader. B. extend the sponsons backwards to make space for a rear idler, additional cover for the rear door, and rear aesthetics. C. place ammo racks (the current front space can fit 42 charges). D. armor arrays and side skirts. later: E. Upgrade kits F. front dozer blade (a la T-72) G. alternate turrets/vehicles
  6. Lord_James
    Interesting they chose a case-mate style tank for the OMFV, and the full caliber gun is also unusual. I like the rounded hull though, very mine resistant
  7. Lord_James
    Somewhere between the rear of the hull and the driver’s hatch. I mentioned why I haven’t made a hole for the turret in my post.
  8. Lord_James
    Hull of the "Song Heavy - 1st Tank" (SH-1T, pun included ): it is 8m long, 3.95m wide (plus an additional 0.04m when I get the basic side skirts modeled), and 1.7m high. Weighs 24.3 Mg (I'm just gonna use Megagrams, so neither I nor others get confused which 'ton' I'm talking about) currently. It has 5 armor cavities in the hull: 1. Lower Hull: 50mm RHA + 585mm array + 50mm "Janet Pressed Armor" (JPA)* angled at 45o. 919mm LoS 2. Left Upper Hull: : 40mm RHA + 200mm array + 40mm JPA angled at 75o. 1082mm LoS 3. Right Upper Hull: 50mm RHA + 380mm array + 50mm JPA angled at 60o. 960mm LoS 4. Lower Hull Sides: 20mm HHA + 850mm track/suspension + 20mm RHA + 100mm array + 45mm JPA. At 30o, 2070mm LoS. At 45o, 1464 LoS 5. Upper Hull Sides: 20mm RHA + 850mm fuel tanks/spare parts bins +20mm RHA + 100mm array + 45mm JPA. same LoS as lower sides. In addition, there is also a 50mm JPA bulkhead between the engine and crew compartments, a double floor, and a separated forward propellant magazine. Array composition coming soontm. I have yet to make a hole for the turret as I need to model the carousel loader and turret basket. Also don't worry about the forward hull sides not having an array, I have other plans for them *Song Industries proprietary armor technology. "Janet Pressed Armor" (JPA) was invented by Mann/Song liaison Janet Wilde; It has a ME of 1 and TE of 1.15-1.20 compared to RHA, can be produced in thicknesses between 25mm and 90mm without sacrificing efficiency, and can also be welded and used as a structural component. Unfortunately, it is more difficult and time consuming to produce than RHA, so use in vehicles will be restrained. (I'll tell you guys what it is when the competition is over, but @N-L-M confirmed that it is valid for the competition)
  9. Lord_James
    For Al 5083 compared to RHA: RHA 1cm x 1cm x 10cm is 78g, and can absorb 100mm of penetration. Al 5083 kinetic TE is 0.3, so 1cm x 1cm x 33.3cm is 89.9g, to stop the same KE threat. The ratio between RHA and Al mass is 0.87. Al 5083 cumulative TE is 0.33, so 1cm x 1cm x 30.3cm is 81.8g, and the ratio is 0.95. These numbers are close to the OP, but several other ratios are given with accuracy to 2 decimal places. I’m just looking for clarification. Also, shouldn’t HHA have a mass efficiency of 2 as it is the same density as RHA, but takes half the thickness of armor (and therefore half the mass, if no other dimensions are altered) to stop the same reference threat?
  10. Lord_James
    @Collimatrix, any sneak peaks at your crazy road wheels and suspension? Edit: also, for anyone, how is the mass efficiency calculated for the available armor materials? Is it “to defeat a reference threat, the mass of armor is [ratio] compared to steel”?
  11. Lord_James
    @N-L-M, are the thicknesses for the ERA and NERA arrays listed in to OP the only thicknesses we can use? Or can we modify them?
  12. Lord_James
    I’m going for a Merkava style layout with engine / transmission front, rear turret, and rear door. Gun is a 155mm L/44 naval cannon, fed via a T-72 style loader (charges are manually inserted, but shells are stored in the carousel). Hoping for <80 tones.
  13. Lord_James
    well, this is all ball park, but my new 3.51kg, 760mm long rod (same 740mm rod with a 0.12kg / 20mm long cap), flying at 1850m/s out the muzzle can penetrate (with the 15% segment reduction) 741mm of armor PB, and (using the same penetration ratio as the previous round) 431mm at 2km... as my penetrator is tapered, and the whole thing is sheathed with a cap, are there any other modifiers I should / could put on this? Edit: Max pressure is 42200 CUP / 47000 psi, barrel length is L/44 (rifled, too), and the charge is separated /semi-combustible similar to 2A46 ammo, 28455 cm3 total capacity. Edit 2: The low pressure Cockerill Mk.3 has a 30500 psi max pressure (sourced via internet), which would be the cut off point for our precision HEAT, I assume?
  14. Lord_James
    my new muzzle velocity is too high for JBM now... what do you guys recommend? also, would I use the average radius of my tapered rod, or the max radius?
  15. Lord_James
    At what velocity do steel penetrators shatter? I kept my sabot at 1450m/s because I was under the impression that steel couldn’t handle much faster. @N-L-M, just to be extra uber sure, the normalizing cap on a penetrator doesn’t count as one of the 2 segments on a segmented rod, does it? I’m trying to make a ~0.4kg cap for the rod but am a little afraid you might count it as another segment. Also, for the HEAT rounds: what constitutes high and low pressure? Would it be the difference between a full pressure and recoilless weapon, or is there a difinitive “above X pressure, it is a high pressure gun”?
  16. Lord_James
    I just remembered De Marre doesn’t really work on segmented rods... but I got those numbers by using the method in “estimating tank gun performance” thread, then using De Marre. My projectile is a segmented, sheathed, tapered rod 950mm long in total, but with a 740mm steel alloy penetrator composed of 2 rods (the forward is 14.5:1 and the rear is 10:1), and tapering down from 30mm to 18mm in a similar fashion to M735. There is also a steel cap (I hope this doesn’t count as a segment).
  17. Lord_James
    well... this is interesting: my 3.39kg steel alloy penetrator travelling at 976m/s at 2000m (1450m/s at muzzle) can penetrate 380mm of armor.
  18. Lord_James
    @N-L-M, are segmented rods haram or can we use them? Also, is PELE technology available, and what is the maximum chamber pressure for our guns?
  19. Lord_James
    That was my first thought when I saw L/D is limited to 15:1. Though, if that’s for the whole rod and not just it’s components, the segmented rods won’t mean anything.
  20. Lord_James
    Are segmented rods a thing, or maybe put 2 rods end to end like in 3BM-42?
  21. Lord_James
    Shooting in Seattle, Washington. Don’t know much about it. Some are theorizing it was random.
  22. Lord_James
    I thought ATMOS was the name of the truck, too. Sorry if this question is getting annoying, but ATMOS is the computer and sensors /systems attached to the computer? Could you link something that says that explicitly (again, sorry if this is annoying, I’m just trying to understand).
  23. Lord_James
    Agreed, though by chassis, I meant “whatever the weapon and armor are attached to”.
  24. Lord_James
    This is how I work: the weapon system and armor come first, the design the chassis to fit those.
  25. Lord_James
    British aristocratic decisions are just terrible, worse than many other examples I’ve seen (though 1930’s France takes the cake); It’s not just “an army of lions lead by a sheep”, it’s an army of lions lead by a bunch of inbred chimps who just screech at each other. One of my aunts got me Norman Friedman’s “British Cruisers. Two World Wars +” and I had to set the book down halfway through because of all the shit the admiralty forced upon the navy. First off, all the different 6” guns had different ammo until standardized during WWII (and even then, some had to use modified ammo); while all US 5” (and 6”) guns of all calibers could use the projectiles from previous guns (yes, the 5”/25 Mark 10 could use the 5”/51 Mark 7 and 8 ammo, but with a different propellant charge). And this applies to almost all British naval weapons (the suicide rate for RN logistic officers must have been abnormally high). If you dive into the minutiae of other classes of British ships, you also find appalling lacks of intuition (or any form of intelligence), like Nelson and Rodney’s guns, the L and M class destroyers, trying to make the 8” BREACH LOADING guns on the County class dual purpose (because 250lb shells will be easy to hand load past 40* elevation...), and the list goes on and on. I’m also ignoring Britain’s attempts to reduce a ship’s tonnage and the size of navies because they couldn’t compete with their broken economy. I’m not trying to rag on the soldiers and sailors of the British isles: these men and women were some of the finest examples of warriors the world had at the time, but it almost brings me to tears that they were forced to use such terrible equipment, brought about via retarded politicians who knew nothing about the science and requirements of war.
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