Kinglet was a boosted fission primary used in several American thermonuclear weapons.[1]
The W55 warhead for the UUM-44 SUBROC anti-submarine missile and the W58 warhead for Polaris A-3 were designed to use Kinglet, while the W47 warhead for Polaris A-1/A-2 were retrofitted with Kinglet to overcome the technical issues with the Robin primary the W47 was initially deployed with.[2][3] Allegedly, only the W47Y2[a] was converted to the Mod 3 design using Kinglet.[4]
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