雷神得標：一千萬鎂

[diechan (小道消息萬萬歲)]

http://tinyurl.com/7eq422l

The contract for the preliminary design of a Pulse Forming Network
(PFN) is part of a larger effort by the U.S. Navy to develop
a multimission weapon system for use on naval warships to defend
and attack with pinpoint accuracy.

Under the contract, Raytheon will provide the research and development
of an advanced Integrated Power Systems power load module that may be
used for PFNs to power future lasers, railguns or radars.

The PFN is a large power system providing the electromagnetic energy
for the railgun projectile, which will travel up to 220 miles in less
than six minutes and exit the atmosphere before hitting its target at
a velocity of 5,000 feet per second.

不過一千萬鎂開發動力系統(還是一顆電容)，應該只是開頭的錢吧

根據
http://news.mydrivers.com/1/215/215757.htm
這個網頁寫的
3300萬焦耳大小的投射能量有很大嗎？

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推 jimcheer:還好吧..?
推 Raptorjet:電磁砲用的嗎?
→ MOONRAKER:"to power future lasers, railguns, or radars."
→ tachikoma:"旋風阿姆......(下略)"
→ MOONRAKER:         羅跟雪拉嘿嘿嘿
→ TSW:高中物理如是說：焦耳=質量*(速度^2)
→ TSW:國中物理如是說：焦耳=庫倫*伏特=秒*安培*伏特
→ TSW:假設拿這3300萬焦耳來丟M256坦克砲的M829A3 APFSDS (22.3kg)
→ TSW:不計損耗，最多獲得1216.5m/s的初速...科科
→ TSW:不到4000feet/s
推 Monoson:樓上動能公式錯誤結論差了sqrt(2)倍
→ Monoson:不過照上面方法推算 設計目標似乎就是相當M256的砲口初速
→ TSW:囧，我哪邊算錯了？
→ TSW:啊，我知道了，動能公式是  1/2*質量*(速度^2)  XDDDDDDDDDDDD
→ TSW:都還給老師了
→ TSW:所以有5644feet/s
推 Monoson:不過上面的22.3kg還包含推進藥重 電磁砲的話就只要推彈頭
推 Monoson:所以砲口初速應該還可以再往上提