MK-50 Advanced Lightweight Torpedo [ALWT]
Torpedoes are self-propelled guided projectiles that operate underwater and are
designed to detonate on contact or in proximity to a target. They may be launched from
submarines, surface ships, helicopters and fixed-wing aircraft. The three major torpedoes
in the Navy inventory are the Mark 48 heavyweight torpedo, the Mark 46 lightweight and the
Mark 50 advanced lightweight.
The MK-50 is an advanced lightweight torpedo for use against the faster, deeper-diving
and more sophisticated submarines. The MK-50 can be launched from all ASW aircraft, and
from torpedo tubes aboard surface combatant ships.
The MK 50 torpedo was developed as the next generation lightweight torpedo to gradually
replace the existing MK 46 torpedo as the Navy's primary ASW weapon for aircraft (fixed
wing and helicopters) and surface ships. It was intended to produce a significantly
improved capability against some nuclear submarines. It has since been modified by Block
Upgrade I. The MK 50 torpedo with Block Upgrade I is intended to be a contributor to
precision engagement as well as full-dimensional protection. It provides the Task Force
commander with an air or surface ship launched anti-submarine weapon for force protection.
The MK 50 torpedo is intended to be an enabler when used to clear hostile waters of
submarines, allowing amphibious forces freedom of operation. Tactically, since it is a
"fire and forget" weapon, it allows the launch platform to maneuver freely
following attack.
The torpedo is slightly over 111 inches long, with a diameter of 12.75 inches and
weight of about 775 lbs. A sonar transducer is mounted in the torpedo nose. Torpedo
operation is defined by the software associated with the Command and Control Section
(CCS). The torpedo uses a closed cycle chemical reaction propulsion system. The MK 50
system includes the torpedo, ancillary support equipment, workshop test and handling
equipment, and logistics support facilities. Warshot and exercise versions of the torpedo
are intended to be deployed from land based patrol aircraft (P-3), ASW carrier-based
aircraft (S-3), ASW helicopters (SH-2, SH-3, SH-60) and ASW surface vessel torpedo tubes.
The MK 50 program was initiated in 1974 with early operational testing [OT] conducted
between 1986 and 1989. OPEVAL began in 1990 and continued into 1991. Following a hiatus to
correct a problem discovered in early OPEVAL, IOT&E resumed in 1992. In OPEVAL Phase
2, discussed in detail in the 1992 DOT&E Annual Report, the MK 50 was operationally
effective in some conditions, and operationally suitable. MK 50 was not effective in some
areas.
A torpedo software program was begun in 1992 to address deficiencies observed in
OPEVAL. This was a two phased approach, Block Upgrade I (BU I) to address some concerns
with small changes, and Block Upgrade II (BU II), intended to further improve performance
with new algorithms. BU II will not be implemented in MK 50, but is intended for
incorporation in the Lightweight Hybrid Torpedo in development. Independent operational
testing of BU I found MK 50 operationally effective in some circumstances, not
operationally effective against targets in some adverse environments, and operationally
suitable.
MK 50 with Block Upgrade I had several major deficiencies. OT-IIIA was not adequate to
address all MK 50 issues. This would not normally be a major concern, since open issues
were originally intended to be addressed in OT-IIIB. However, the Navy does not plan to
conduct operational testing of MK 50 in key areas and scenarios. This leaves some
significant operational effectiveness questions unanswered. DOT&E will continue to
follow these issues, and encourage the Navy to complete operational testing. Immature
tactical employment documentation and limited interoperability with different fire control
systems could cause MK 50 to be ineffective. These shortfalls are being addressed by the
Navy.
There is no current TEMP and there has been no formal test activity in 1997. The Navy
conducted some exercises involving firings of MK 50 torpedoes in realistic environments.
Additionally, the Navy Undersea Warfare Center performed some evaluations of MK 50
performance.
A number of the exercise torpedo firings were considered "no-tests" because
of operator errors in pre-setting and employing the torpedo; however they were in fact
significant for suitability reasons. There are several inter-related causes of the errors
on these "no-tests." First, there are too many dissimilar fire control systems
used, some of which have confusing switch position labels, so training and tactical
documentation is not universally applicable. Second, the tactical documentation is
convoluted, requiring the use of several different tables (with different variants for
each fire control system and weapon). The standard Navy method to overcome this artificial
complexity is to train operators; unfortunately there is insufficient operational
training, due primarily to the $70,000 turnaround cost for each exercise MK 50 torpedo.
DOT&E identified this to the program office, and recommended that the surface ship and
aircraft fire control systems be modified to interact with the operator and the torpedo in
a consistent fashion, and that tactical documentation be simplified. Some modification is
being implemented in some systems.
In FY97 exercise firings, the MK 50 torpedo performed well.
Two revised, simplified tactical employment guidelines have been developed by the Navy.
The aircraft guidelines have been approved, the surface ship guidelines are still under
review. These guidelines can improve the chances of successful employment of MK 50.
Firings of Block Upgrade I MK 50 torpedoes in one key area and against targets in some
likely conditions remains to be done. Until such testing is done, there will be serious
concerns about MK 50's ability in some scenarios.
In summary, while it has some significant performance deficiencies, the MK 50 is the
best air-dropped torpedo in the U.S. Navy inventory, and possibly the best in the world.
Unfortunately, quantities of the expensive MK 50 are limited.
Specifications
|
Primary Function |
Air and ship-launched lightweight torpedo |
Contractor |
Alliant Techsystems
Northrup Grumman [Westinghouse]
Raytheon Electronic Systems |
Power Plant |
Stored Chemical Energy Propulsion System |
Length |
112 inches |
Weight |
750 pounds |
Diameter |
12.75 inches |
Speed |
40+ knots |
Range |
|
Depth |
1,900+ ft. |
Guidance System |
AKY-14 programmable digital computer with active sonar and passive acoustical homing |
Warhead |
Approximately 100 pounds high explosive (shaped charge) |
Inventory Objective |
1000 systems |
Total program cost (TY$) |
$3100M |
Average unit cost (TY$) |
$2.9M |
Full-rate production |
Low Rate Only |
|