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  1. Scolopax

    Scolopax

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    • By Vicious_CB
      http://soldiersystems.net/2018/05/14/nswc-crane-carbine-mid-length-gas-system-testing-shows-increased-performance/
       
      So in Crane's testing of the URG-I vs M4A1, the numbers make sense except for this one. Maybe you ballistic gurus can answer this because I have no idea.
       

       

       
      How can you have 2 significantly different mean muzzle velocities at 100 yards when they both started off with nearly the same muzzle velocity, out of the same length barrels with the same twist rate? It cant be stability since that is based on starting velocity and twist rate.  Is there some kind of magic that the midlength gas system imparts on the bullet that causes it to have less velocity decay or is this just a statistical artifact? 
       
    • By sevich
      I realize that sandbags provide little to no armor protection, but soldiers still used them on tanks. Would they mitigate the effects of HE warheads, or the blastwave of HEAT warheads?
    • By Walter_Sobchak
      This is a must watch for all Sherman tank fans.  
       

    • By Walter_Sobchak
      This thread is where to post all the stupid and annoying tank myths that fail to go away.  We shall start with two pointed out by Marsh over in the Swedish tank thread.
       
       
      1. The S-Tank was designed as a tank destroyer or as a tank only fit for just defensive missions.   2. The Merkava was designed for asymmetric combat in an urban environment, rather than full scale armour versus armour battle.     I will add a few:   Any tank suspension without return rollers is a "Christie" suspension.  In particular, T-55 and T-62,   HEAT munitions create a molten jet that "burns" its way through armor.    The French 75mm gun on the AMX 13 is a copy of the German KwK 42        
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