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w-78 vs. W-76 - Comparison of sizes
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w-78
W-76

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w-78
W-76
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w-78

w-78
w-78
Blast Radius Blast Radius4950km
Fireball Radius Fireball Radius 0.630km
Height Height21,3m
Kilotons Kilotons350kt
Radiation Radius Radiation Radiuskm

The W78 thermonuclear warhead is the warhead used on most of the United States LGM-30G Minuteman III intercontinental ballistic missiles (ICBMs), along with the MK-12A reentry vehicle which carried the warhead. Minuteman IIIs initially deployed with the older W62 warhead; the W78 was deployed starting in December 1979 onto 300 missiles, three warheads per missile. Declassified records indicate a total of 1,083 W78s were produced. The W78 was designed at Los Alamos National Laboratory starting in 1974.



The design is thought to combine the secondary (fusion) stage design of older ICBM warheads such as the W50 with a more modern primary stage (see Teller-Ulam design for more details). The W78 has a publicly announced yield of 335–350 kilotons of TNT (1.40–1.46 PJ).Dimensions of the W78 are unknown, but it fits within the MK-12A reentry vehicle, which is conically shaped, 21.3 inches in diameter at its base and 71.3 inches long. The W78 is estimated to weigh 700–800 pounds (317–363 kg).

Source: Wikipedia
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W-76

W-76
W-76
Blast Radius Blast Radius3.260km
Fireball Radius Fireball Radius 0.380km
Height Heightm
Kilotons Kilotons100kt
Radiation Radius Radiation Radius1.110km
Weight Weight164kg

The W76 is a United States thermonuclear warhead, designed for use on the UGM-96 Trident I sea-launched ballistic missiles (SLBMs) and subsequently moved to the UGM-133 Trident II as Trident I was phased out of service. The first variant, the W76 mod 0 (W76-0) was manufactured from 1978 to 1987, and was gradually replaced by the W76 mod 1 (W76-1) between 2008 and 2018, completely replacing the Mod 0 in the active stockpile.



In 2018 it was announced that some Mod 1 warheads would be converted to a new low-yield W76 mod 2 (W76-2) version. The first Mod 2 warheads were deployed in late 2019.

Source: Wikipedia

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