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Xoon

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  1. Tank You
    Xoon got a reaction from Laviduce in The Leopard 2 Thread   
    Turret number matches the army's posterboy:

     
    Leopard 2 121 Allfader:





     
     

     

     
     
    Might have been used to test new armor for the upgrade program:

     
  2. Tank You
    Xoon got a reaction from Krieger22 in The Leopard 2 Thread   
    Turret number matches the army's posterboy:

     
    Leopard 2 121 Allfader:





     
     

     

     
     
    Might have been used to test new armor for the upgrade program:

     
  3. Tank You
    Xoon got a reaction from Toimisto in The Leopard 2 Thread   
    Turret number matches the army's posterboy:

     
    Leopard 2 121 Allfader:





     
     

     

     
     
    Might have been used to test new armor for the upgrade program:

     
  4. Tank You
    Xoon got a reaction from SH_MM in The Leopard 2 Thread   
    Turret number matches the army's posterboy:

     
    Leopard 2 121 Allfader:





     
     

     

     
     
    Might have been used to test new armor for the upgrade program:

     
  5. Metal
    Xoon got a reaction from Zyklon in United States Military Vehicle General: Guns, G*vins, and Gas Turbines   
    As far as I am aware, you simply use a longer swing arm if you want longer travel. However, considering that you can't have 1000 mm of travel because of obvious reasons, you need better dampening, which is where the actual performance of the suspension comes in.  The reason why the Challenger II has less travel is because it does not need it. The better dampening compensates for it. 
    Think about how the recoil mechanism of a gun works. 
     
     
    Thanks for explaining!
     
     
    How? 
    As long as you can adjust the pressure of the hydraulic line, it should not really add anything to the system. 
    AFV manufactures keep advertising their "open architecture high speed networked" AFVs. 
    This means that all the subsystems are networked together.  No additional wiring needed between the FCS and main computer, and no extra needed wiring between the main computer and suspension control unit. 
    If not, I would honestly fire the engineer in charge of these systems for incompetency.  Or straight out reject the AFV as a costumer. 
    The rest is just code:

    def suspension_temperature_compensation(temp_value, adjust_value):
       """ Program for adjusting the suspension after the ambient temperature.  """
       sus_adjust = temp_value * adjust_value
       return sus_adjust
     
    suspension_temperature_compensation(80, 0.1)
     
    By inputting the value 80, meaning 30 degrees C ( -50 C becomes 50, and 30 C becomes 30, 50 + 30 = 80), and the adjustment value, which would be the expansion ratio of the gas compered to the temperature.
    I set it to a arbitrary 0.1, which would make the function output 8, as in 8 mm increase in the suspension height.  This would then be feed into a the controller of the suspension, which would adjust accordingly. 
    Actually, the entire code above would probably be integrated into the ride height programming. 
    This was coded in Python, for those who want to know the syntax. 
    This is not really complex. Digital programming does not really break down faster because of more complexity.
     
    Or you can use a virtual PID regulator. It would be better. 
     
  6. Metal
    Xoon got a reaction from roguetechie in United States Military Vehicle General: Guns, G*vins, and Gas Turbines   
    As far as I am aware, you simply use a longer swing arm if you want longer travel. However, considering that you can't have 1000 mm of travel because of obvious reasons, you need better dampening, which is where the actual performance of the suspension comes in.  The reason why the Challenger II has less travel is because it does not need it. The better dampening compensates for it. 
    Think about how the recoil mechanism of a gun works. 
     
     
    Thanks for explaining!
     
     
    How? 
    As long as you can adjust the pressure of the hydraulic line, it should not really add anything to the system. 
    AFV manufactures keep advertising their "open architecture high speed networked" AFVs. 
    This means that all the subsystems are networked together.  No additional wiring needed between the FCS and main computer, and no extra needed wiring between the main computer and suspension control unit. 
    If not, I would honestly fire the engineer in charge of these systems for incompetency.  Or straight out reject the AFV as a costumer. 
    The rest is just code:

    def suspension_temperature_compensation(temp_value, adjust_value):
       """ Program for adjusting the suspension after the ambient temperature.  """
       sus_adjust = temp_value * adjust_value
       return sus_adjust
     
    suspension_temperature_compensation(80, 0.1)
     
    By inputting the value 80, meaning 30 degrees C ( -50 C becomes 50, and 30 C becomes 30, 50 + 30 = 80), and the adjustment value, which would be the expansion ratio of the gas compered to the temperature.
    I set it to a arbitrary 0.1, which would make the function output 8, as in 8 mm increase in the suspension height.  This would then be feed into a the controller of the suspension, which would adjust accordingly. 
    Actually, the entire code above would probably be integrated into the ride height programming. 
    This was coded in Python, for those who want to know the syntax. 
    This is not really complex. Digital programming does not really break down faster because of more complexity.
     
    Or you can use a virtual PID regulator. It would be better. 
     
  7. Tank You
    Xoon got a reaction from roguetechie in The UK Brave Space For Shitposting and Other Opinions Thread   
    I am highly skeptical to this law.  Considering all the policing, witch hunts, smear campaigns and the "It is a automated system, therefor, we are not actually acting like a Totalitarian police state with very vague rules to allow us to ban indiscreetly anyone we like , it is just some bugs ;)" we see in mayor social media platforms. Most youtubers are switching to patron type income because they are shut down for questionable reasons. 
     
    The Nazi's just wanted to clean out the inferior, degenerate part of humanity.  To make sure only the best suited would lead on the next era of humanity.  
    They only had good intentions right? 
     
    Well, history speaks for itself. 
     
    If they pull it off as they claim. Kudos to them. But I am sure they have a few hidden intentions. And if not, then the next generation will exploit it. 
     
     
  8. Tank You
    Xoon got a reaction from Karamazov in Main Ground Combat System (MGCS) and Euro Main Battle Tank (EMBT)   
    My bad, but wasn't it one of the prototypes also for the Europanzer? 
     
    This image is commonly used for the Europanzer. 
  9. Tank You
    Xoon got a reaction from Karamazov in Main Ground Combat System (MGCS) and Euro Main Battle Tank (EMBT)   
    Side view of Europanzer, a failed Franco-German tank project, predecessor to the Leopard 1 and AMX-30.
     
    Same tank that Zuk posted.
  10. Tank You
  11. Tank You
    Xoon got a reaction from Zyklon in French flair   
    Yes, it was what I was thinking. But wouldn't the electric motor give a much faster spool up time? 
    Also, hooking it up the the main battery of the vehicle, it could use excess energy to power the motors, or use regenerative breaking the power equipment. 
     
     
    Not necessarily, combining the power of the electric motor, with zero turbolag would be the best. 
     
    Idea was to eliminate turbolag. But a electric compressor is also a great way of getting short bursts of power. 
     
    What about a electrically assisted hyperbar turbo engine, with a electric starter/generator/regenerative break/electric motor. When the driver presses the accelerator, the electric motor in the turbo spools the turbo up to optimal RPM istantly, while the starter motor on the crankshaft provides high torque while the motor reaches its optimal RPM. The turbine helps the motor keep the turbo at optimal RPM. 
     
    When the vehicle slows down, the excess energy in the turbo is scavenged, and the regenerative break recovers some of the energy and stores it in the battery. A exhaust scavenger system could also be used. When on overwatch, the turbine would power the equipment, and when one wants to silently change position, one can use the electric motor and battery for short, slow and silent movement. 
  12. Tank You
    Xoon got a reaction from Laviduce in Tank Layout   
    I think this shape would be simple and effective:

    Belly is composed of two sloped plates, spaced apart with air between to work as a cushion. Preferably the plates would slope upwards until they are vertical, where they would be welded to the side armor. Either a cast or bent plate could be used.  The underside of the sponsons are curved upwards and outwards to direct the blast away from the hull. Double hull could be used here, but I am not sure if it is worth it.
  13. Tank You
    Xoon got a reaction from Lord_James in Tank Layout   
    I would say, if you intend to do proper, advanced drawings, use a proper CAD. SketchUP is  very easy to use, however, it is also quite a pain in the ass when making more advanced models. I am currently learning Solid Edge, which is free. It can generate drawings too, so that you can get a drawing like the one of the BMPT-84. 
     
    Welcome to the forum by the way.
  14. Metal
    Xoon reacted to TokyoMorose in The Leopard 2 Thread   
    I am not sure how it is done for Leopard 2 components, but I have seen entire cast or welded assemblies heated up and quenched at once in appropriately massive facilities. This image of a Panzer 68 hull being Quenched at Thun always comes to mind.
     
    Welding plates post heat-treatment is very difficult without making the zone around the weld weak. It is usually preferred in metallurgy to weld before heat treatment and then do it all together.
  15. Tank You
    Xoon got a reaction from Xlucine in French flair   
    148L/10Km for M1A2.
    138L/10Km for Leclerc.
    72L/10Km for Leopard 2.
     
     
    Source:
    http://www.ointres.se/projekt_stridsvagn_ny.htm
  16. Metal
    Xoon got a reaction from Sovngard in Tank Layout   
    My issue is the huge empty space on each side of the gun, shouldn't it be possible to fit two drums on each side?
     
    Roughly this size:

     
     
    Welcome to the forum James!
     
    Zuk here used the Meggit autoloader as a example because the Leclerc autoloader only fits around 16 rounds, might be 21, but still way to low. 
     
     
    This forum is growing fast.
     
    Nice to hear that Tovarish might be coming over.
     
     
    A oscillating turret are quite tall, or has to have less gun depression/elevation.
     
    I think a cleft turret would be a better bet.

     
     
     
    The Swedish tested several turret layouts and found the cleft turret to be the best, here's a comparison of a conventional turret, a autoloaded conventional turret, and a cleft turret. 

     
     
    Of course the overhead turret will turn out taller than on the picture, but it cuts out over a meter of length from the oscillating part, giving it much better elevation.
     
     
    Here is a view of how the turret looks while depressed, though probably exaggerated:

     
     
    Good point, I do not think that a fuel tank/ammo rack combination would be a problem with a blow out panel. Same with wet racks. Though, I am pretty sure you can't use fuel as the "wet" part in a wet rack.
     
  17. Tank You
    Xoon got a reaction from Lord_James in Tank Layout   
    Image uploading site, like imagur.
     
     
     
    Oh well, I guess the French needs their quirks.
  18. Tank You
    Xoon reacted to Alzoc in Tank Layout   
    On the mass balance topic, here's a citation of a book I (and probably other French speaking members) own.
    Even if you don't speak French it's quite a nice book to have with plenty of pictures (all those pictures of the various early EPC concept comes from here), though you have the impression that nobody ever proofread it (screw grammar and the orthograph^^).
     
    P58:
     
    Comme pour la fonction mobilité, une mécanique de haute technologie est requise pour la fonction feu. Celle-ci est entièrement conçue pour faire du tir en roulant le mode normal d'engagement des cibles.
    La précision de la stabilisation est donc au cœur des performances du système. Stabiliser un objet dans l'espace (en l’occurrence la tourelle et son canon) est un défi technique qui requiert de la part de l'ingénieur en mécanique le respect des trois règles d'or:
     
    -La recherche des équilibres ;
    -Le contrôle des élasticités et des déformations dynamiques ;
    -La chasse au jeu entre les pièces.
     
    Ces équilibres sont obtenus par conception du canon de 120mm et de la tourelle dont les centres de gravité sont respectivement situés sur les axes de rotation site et gisement.
     
    Canon et tourelle sont mis en mouvement à l'aide de moteurs électriques transmettant leur puissance à des boîtes mécaniques de pointage dont les élasticité sont contrôlées en permanence grâce à un montage utilisant des barres de torsion.
    Enfin des roulements à billes sans jeu assistent le mouvement du canon dans l'axe vertical.
    Sans ces technologies mécaniques particulières, la meilleure électronique du monde ne saurait conserver le canon en direction de la cible sans une débauche de puissance peu compatible avec les contraintes d'emport dans une tourelle.
     
    Google trad doesn't make too bad of a job translating it but the main points are:
     
    -The gun center of gravity lay on the level of the trunnion
    -The turret center of gravity is on the axis of rotation of said turret
    -The elasticity of the mechanical parts driving the gun and the turret are monitered in real time using torsion bars (don't know exactly how)
    -Ball bearings with minimal backlash (and same apply for most moving parts) are used.
    -No hydraulics, everything is electrically driven.
  19. Metal
    Xoon reacted to Alzoc in Tank Layout   
    There was a shitload of concept for the Leclerc (same for any 3rd gen MBT I guess).
    Take your pick:
     
     
  20. Tank You
    Xoon reacted to Alzoc in Tank Layout   
    It is, and AFAIK it was done to eliminate any alignment issue with the gun.
    The designers went to great length to have an extremely stable gun so why not link the gunner sight to it? (Should be stable as well right?)
     
    The problem it cause is obviously the infamous gunner sight weakspot.
     
    Nowadays electronics and informatics have come a long way (Remember that when the Leclerc came out, having a tank fully digitalized and not relying on analogical devices at all was kinda rare) so I doubt they would bother with all those mechanical parts if they had to remake it.
  21. Metal
    Xoon reacted to Lord_James in Tank Layout   
    Why not have a bustle loader like the Leclerc or T-84 Yatagan? Would allow for a roof mounted turret and a long bustle over the crew capsule. 
     
     
    Also, first post from a ~2 month lurker. Hey Xoon, Alzoc, Ramlaen and Zuk  
  22. Tank You
    Xoon reacted to Laviduce in The Leopard 2 Thread   
    Hello Xoon !
     
    Here are the translations:
     
    red -   Operational Pressure
    orange - Control Pressure/Actuators
    yellow - Pre-control pressure
    green - Recoil
    white - N2
    white -  Air
     
    These should be about right.
  23. Metal
    Xoon reacted to Laviduce in The Leopard 2 Thread   
    Hi Xoon,
     
    I do not have all the information you requested but this might be of interest. According to Krapke:  For the Leopard 2(A0-A4) the gun laying system or Waffennachführanlage (WNA) is known as H22.  It is a electric-hydraulic retarder control eqipped hydrostatic motor where an electric motor powers a coaxial piston pump which pumps the hydraulic fluid out of the reservoir into hydro storage cell.
     
    Here is the diagram of the WNA H22:
     
     
  24. Tank You
    Xoon got a reaction from LostCosmonaut in CV-90, why so much love ?   
    Pictures from Joint Reindeer exercise:

     
     
     
    Source:
    https://forsvaret.no/fakta/aktivitet/ovelser/joint-reindeer-2018
    https://forsvaret.no/aktuelt/trener-sammen-for-å-bli-gode-sammen
  25. Tank You
    Xoon got a reaction from Xlucine in The Leopard 2 Thread   
    Pictures from Joint Reindeer exercise:

     
     

     
     

     
     
     
     
    Source:
    https://forsvaret.no/fakta/aktivitet/ovelser/joint-reindeer-2018
    https://forsvaret.no/aktuelt/trener-sammen-for-å-bli-gode-sammen
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