|Type||Anti -submarine missile|
|Combat weight||630 kg|
|drive||MK-114-Mod-0 solid rocket engine|
|speed||Mach 1.0 (330 m / s)|
|Warhead||MK.46 torpedo or Mk.54 torpedo|
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The RUM-139 VL-ASROC is an anti-submarine rocket of the United States Navy , by Lockheed Martin as the successor of -five RUR ASROC is produced. The RUM-139 consists of a rocket that first approaches the target over water. In the vicinity of the target, the rocket engine is blown off, the torpedo falls into the water by parachute and completes the remaining distance under water.
In the early 1980s, the US Navy was looking for a successor weapon for the anti-submarine missiles RUR-5 ASROC and UUM-44 Subroc . The aim was to develop a uniform weapon system that can be used from surface warships and submarines. This initially resulted in the RUM / UUM-125 program , which Boeing was commissioned with in 1982. Since there were early doubts in the US Navy that the UUM-125 could also be used as a RUM missile, the Goodyear Aerospace Company commissioned the RUR-5-ASROC missile for the new Mark-41 Vertical Launch as early as 1983 System to adapt. Goodyear first modified such a missile by equipping it with a controllable solids booster and adding digital flight controls. A Mark 46 lightweight torpedo was also used as a warhead . Initially it was planned to put the RUM-139 into service in 1989, but after several failed tests in 1986 the schedule could no longer be kept. Delays in development increased costs and resulted in the program being suspended in 1988. But since the development of the RUM-125 Sea Lance was also stopped in 1990, the US Navy was able to push through the further development of the RUM-139.
In the meantime, the Loral Company had taken over the program and relied on the new MK-114-Mod-0 solid rocket engines instead of boosters. In combination with an improved flight control and a thrust vector control , a flatter trajectory could be achieved, which reduces the error rate when throwing the torpedo, as the influence of high-altitude winds was reduced. Since the attempts were now much more successful, although the originally planned use of the Mark 50 torpedo could not be implemented, the first RUM-139A specimens were put into service in 1993.
In 1995 Lockheed Martin took over the Loral Company and continued development of the RUM-139. In 1996 the RUM-139B was introduced, which had slight modifications to the Mark 46 torpedo. In 2001, the development of the RUM-139C, which used the new Mark 54 torpedo, finally began. In 2007, a total of 450 RUM-139 missiles were delivered, which are used by the US Navy and the Japanese Navy .
The training version of the RUM-139 is listed as the RTM-139.