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W54
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The W54 nuclear warhead was used in the man-portable
M-388 Davy Crockett projectile. The unusually small size of the warhead is apparent.
The
W54 was one of the smallest
nuclear warheads deployed by the
United States. It was a very compact implosion-type
nuclear weapon design, designed for tactical use and had a very low
yield for a nuclear weapon, in the range of 10 to 1,000 tons
TNT equivalent.
Contents
Development
A 1958 test of the XW-54 warhead yielded 6 kilotons
[1]
The W54 was designed by
Los Alamos Scientific Laboratory and built by the
United States Atomic Energy Commission. Around 400 units were manufactured from 1961 until early 1962 and were deployed until at least 1971.[
citation needed]
Preproduction testing
The earliest identified
nuclear tests of devices corresponding to the W54 characteristics were the Pascal-A and Pascal-B test detonations in 1957, in the
Operation Plumbbob nuclear test series. These were both intended to have very low yield, but overshot to higher yields (tens and hundreds of
tons of TNT).
These were followed by tests of the XW-51 design, which evolved into the XW-54 in the
Operation Hardtack I test series in 1958 (Hardtack
Quince and Hardtack
Fig). These were both described as
fizzles, or test failures.
A number of XW-51/XW-54 tests followed in the 1958
Operation Hardtack II test series, including Hardtack II Otero, Bernalillo, Luna, Mora, Colfax, Lea, Hamilton, Dona Ana, San Juan, Socorro, Catron, De Baca, Chavez, Humboldt, and Santa Fe. By this time, the XW-51 / XW-54 design had been test-fired more times than any preceding US nuclear weapon prior to its successful introduction in service, indicating the difficulty of successfully making this small and low-yield design work reliably and safely.
Further testing followed in the 1961
Operation Nougat test series, probably including Nougat Shrew, Boomer, Ringtail, and possibly others. By this time the W-54 design was performing consistently as expected at low yields.
Variants
There were four distinct models of the basic W54 design used, each with different yield, but the same basic design. These were:
Specifications
All four variants share the same basic core: a nuclear system which is 10.75 inches (273 mm) diameter, about 15.7 inches (400 mm) long, and weighs around or slightly over 50 pounds (23 kg).
[2]
The W54 core, based on the available Training Manual illustrations (particularly of the
Davy Crockett) was a spherical device 10.75" in diameter plus the Safe-Arm and Electronics module in the tail cone with time fuse and a Contact fuse in the nose. The best photographic interpolation match to its external dimensions is a center cylindrical section 11 inches in diameter and 5 inches long, with roughly 5.5 inch radius hemispherical nose and conic tail cone. Other pictures show a smoothly contoured 5" minor by 5.5" major axis elliptical nose with a 5" minor by 21.5" truncated elliptical tail. Four fins extend the over all length to 31", with a central hemi-spherical to cylindrical projection that serves to join the bomb to the spigot-piston that is muzzle loaded into the launcher.[
citation needed]
Known and theoretical uses
The W54 would have fit into the
Special Atomic Demolition Munition ("Backpack Nuke") casings
These small-size devices were first intended for use by
United States Army ground soldiers in battle and were in theory small enough to be delivered by a
bazooka-style firing mechanism. Early known versions could destroy a two-block area, with an estimated yield comparable to approximately 10 tons
TNT equivalent. Larger versions were later developed with a selectable yield of between 10 and 250 tons. The yield of 10 tons TNT equivalent was just below the largest yield for any conventional bomb built until the 1950s,
T-12 Cloudmaker (designed in 1944), at a mass of close to 20 metric tons yielding a blast of 11 tons TNT equivalent. The W54 is small enough to be deployed as a SADM (
Special Atomic Demolition Munition), or so-called "Backpack Nuke". It was the closest thing the U.S. is known to have developed to a so-called "
suitcase bomb".
The W54 style warhead was known to be used on the
M-388 Davy Crockett, a tactical nuclear recoilless rifle projectile that was deployed by the United States in 1961 and decommissioned in 1971.
The W54 was tested for use in a
U.S. Navy SEAL project that was demonstrated as feasible in the mid-to-late 1960s, designed to attack a harbor or other strategic location that could be accessed from the sea. The SEAL version would be delivered into water by parachute along with a two-man team, then floated to the target, set in place and armed by hand.
The
United States Air Force also developed a project using the W54, the
Hughes Electronics AIM-26 Falcon. This was a larger, more powerful version of the
AIM-4 Falcon air-to-air missile. It is notable for being the only known production U.S. guided
air-to-air weapon with a nuclear warhead. It was intended to destroy formations of Soviet bombers at a time when guided missiles were not accurate enough to produce high-probability kills with small conventional warheads.
W72
After the AIM-26 Falcon was retired, 300 units were rebuilt into an improved configuration with a higher yield and redesignated the
W72. These warheads were then used to produce a number of nuclear versions of the
AGM-62 Walleye television-guided glide bomb system. The W72 variant had a yield of around 600 tons of TNT.
The 300 W72 units were produced between 1970 and 1972 and were in service until 1979.
Documented testing
Stockpiled W54 warheads were
test-fired at the
Nevada Test Site on July 7 and July 17, 1962. In
Little Feller II (July 7), the warhead was suspended 3 feet above the ground and had a yield equivalent to 22 tons of TNT. In
Little Feller I (July 17), the warhead was launched as a
Davy Crockett device from a stationary 155-millimeter launcher and set to detonate between 20 and 40 feet above the ground around 1.7 miles from the launch point, with a yield of 18 tons. This test was the last atmospheric test at Nevada Test Site and was performed in conjunction with
Operation Ivy Flats, a simulated military environment. It was observed by Attorney General
Robert F. Kennedy and presidential adviser General
Maxwell D. Taylor. Ivy Flats Film Report
[3] was declassified by the
United States Department of Energy on December 22, 1997. Limited operational details of early SADM projects were published prior to this declassification.
See also