GTR-18 Smokey Sam

Last updated
GTR-18
GTR-18s ready to launch Philippines 1984.JPEG
Two GTR-18 "Smokey Sams" on LMU-23/E single-bay launchers
Type SAM simulator rocket
Place of origin United States
Service history
In service1980s-present
Used by United States military
Production history
DesignerNaval Air Warfare Center Weapons Division (NAWCWD)
Designedearly 1980s
Specifications
Mass1.430 pounds (649 g) [1]
Length15.5 inches (394 mm) [2] [3]
Diameter2 inches (51 mm)
Wingspan6.0 inches (152 mm) [2]

Engine Solid fuel rocket
15 lbf (6.80 kgf) (66.72 N) of thrust [1]
Propellant499 grams (17.6 oz) X-60 [2]
Flight ceiling1,800 feet (550 m) to 2,000 feet (610 m) [3] [1] [4]
Boost time6 seconds at 70° [1]
Maximum speed 165 m/s (540 ft/s) [3]
Guidance
system
None
Steering
system
None
Launch
platform
single-bay LMU-23/E or four-bay LMU-24/E [5]

The GTR-18A, commonly known as the Smokey Sam, is a small unguided rocket developed by Naval Air Warfare Center Weapons Division (NAWCWD) in China Lake, California as a threat simulator for use during military exercises. Widely used in training, the Smokey Sam remains in operational service with the United States military.

Contents

Design and development

The GTR-18 was conceived in the late 1970s by Robert A. McLellan, a Weapons Range Scientist working with Exercise Red Flag at Nellis Air Force Base. He first searched for a commercially available system that would perform as he envisioned. It quickly became apparent that no commercial product would perform adequately, so the development of the GTR-18 was undertaken by the Naval Weapons Center (NWC) during the early 1980s, with the intent of developing Mr. McLellan's idea of a simple and inexpensive rocket for visually simulating the launch of surface-to-air missiles (SAMs) during training exercises. [6]

The design of the GTR-18A rocket is very simplistic and intended for minimal cost with the fuselage and nose cone being constructed from phenolic paper while the fins are constructed out of styrofoam. [6] [5] The fuselage and fins are joined to the nose cone by the motor tube which contains 499 grams (17.6 oz) of X-60 solid fuel propellant. [2] Because of its very light construction, the Smokey Sam will only cause minimal damage even if it accidentally strikes a low-flying aircraft. [6] [2] [5]

Operational history

A GTR-18 is launched at the Crow Valley Range Complex, Philippines, 1984. GTR-18 launch Crow Valley Philippines 1984.JPEG
A GTR-18 is launched at the Crow Valley Range Complex, Philippines, 1984.

The complete launch system, known as the Smokey Sam Simulator, includes single-rail LMU-23/E and four-rail LMU-24/E launching pads, an AN/VPQ-1 radar set, the PVU-3A/E Igniter [7] and the GTR-18A rockets themselves, making up the SMU-124/E system as a whole. [6] [5]

When launched, the GTR-18's rocket motor produces a distinctive white plume, providing a realistic simulation of the launch of a surface-to-air missile. [8] While the ordinary GTR-18A has a simple, model rocket type motor, an improved "Dual Thrust Smokey Sam" tested in the early 2000s featured a modified rocket motor, providing a 1.5 second boost period, followed by a lower-thrust sustainer burn with burnout occurring at 7.1 seconds after launch. [9]

This motor was altered to use a two-part laminated grain propellant which utilized both the standard zinc based grain and a high thrust aluminium based grain as used by other US rockets. The new propellant allows the "Dual Thrust Smokey Sam" to have a boost and sustain signature to better imitate a surface-to-air missile and while thrust is initially low, the higher thrust for the majority of the motors burn time gives an improved trajectory. [10]

The Smokey Sam remains in production and operational service, and is extensively used by the U.S. military. [6]

Notes

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References

  1. 1 2 3 4 "GTR-18 National Stock Number". nationalstocknumber.info. Retrieved 4 January 2023.
  2. 1 2 3 4 5 "GTR-18A UXO". uxoinfo.com. Retrieved 4 January 2023.
  3. 1 2 3 "GTR-18 A Smokey Sam". manfred-bischoff.de. Retrieved 3 January 2023.
  4. "GTR-18A Smokey Sam". everyspec.com. Retrieved 3 January 2023.
  5. 1 2 3 4 "GTR-18 Smokey Sam". designation-systems.net. Retrieved 3 January 2023.
  6. 1 2 3 4 5 Parsch 2002
  7. "GTR-18 Military Specifications". everyspec.com. Retrieved 3 January 2023.
  8. Kitfield 1995, p.166.
  9. Taylor 2006
  10. "Dual Thrust Smokey Sam" (PDF). ndiastorage.us. Retrieved 6 January 2023.

Bibliography

Military specifications