一楼度娘

据说成本和重量的增加幅度不大

你够快的
加长炮管的M777超轻型榴弹炮(代号M777ER)在美国亚利桑那州尤马试验场进行试射
M777ER采用了超长的55倍口径155毫米炮管。美国陆军宣称M777A2型榴弹炮【左侧】改造成为M777ER【右侧】仅需要更换五个部件，几乎不会增加额外的重量或成本。

M777ER将使用“弹道跟踪雷达系统”(PTS)。PTS安装在一部拖车上，由一窄波束雷达和探测器组成，可对飞行中的炮弹进行跟踪并在“应该命中”的目标位置和“实际弹着点”之间进行比较。火炮根据比较结果不断修正射击诸元，以保证每次射击任务有一个最佳瞄准点。这种修正逐发进行，可以大大提高射击精度，还使得火炮不再依赖前沿观察员来确认弹着点。

药室不变？反后坐不变？

The Extended Range Cannon Artillery, or ERCA, project is funded by ARDEC’s science and technology office and charged with developing technology to extend the range of all 155mm artillery. The ERCA program develops not only the XM907 cannon but also products, such as the XM1113 rocket assisted projectile, the XM654 supercharge, an autoloader, and new fire control system.
To begin efforts to test mobility, PM-TAS demonstrated a modified M777A2 Howitzer with an integration kit for the mass mock-up of the modified XM907 ERCA cannon at Yuma Proving Ground, Arizona. Follow-on mobility testing will be conducted at Aberdeen Proving Grround, Maryland, to document the changes in mobility from a standard M777A2, if any.
The demonstration will not include firing the weapon, but will show how the gun responds when it travels and how it feels when the crew interacts with the controls.
With nearly 1,000 pounds (450 kg) added to the system’s overall weight and an additional six feet (1.8 m) of cannon tube, the demonstration is taking place to give the Soldiers and Marines more confidence that the gun will still meet all of its mobility requirements.
The mobility tube consists of an old 52-caliber tube that was modified to fit into an M777A2 at the weight of the XM907. Additionally, grooves were added to the exterior of the tube to allow Picatinny engineers to hang weights at different positions, enabling them to move the center of gravity of the weapon forward or rear.

好已阅

@贴吧用户_Q4C65Dy @咸鱼荣耀 @风鸟云zz @李小娟和西住美穗 @88燧

三哥，买买买

好长。。。

重了不到一吨，射程翻了一倍，还是挺值的