a yellow sun-cased bomb on trolley
deployment started in 1959-60. raf service designations bomb, aircraft 7000 lb hc mk.1 or bomb, aircraft 7000 lb hc mk.2.
yellow sun mk.1 intended emergency weapon, , had not been engineered reliable long-term stockpiling. envisaged mk.2 version available later fitted true thermonuclear warhead derived granite type tested @ grapple, or american type made available after 1958 anglo-us bilateral agreement. carried raf v bombers. in september 1958 decision made abandon granite type warheads intended yellow sun mk.2 (and blue steel, , blue streak mrbm) , instead adopt w-28 warhead used in mk-28 nuclear bomb. anglicised adapt british engineering practices, , manufactured in britain using british fissile materials , known red snow.
red snow both more powerful, lighter , smaller green grass. envisaged yellow sun bomb casing adapted successor warheads minimise unessential development time , cost. yellow sun mk. 2 entered service in 1961, , remained primary air-dropped strategic weapon until replaced we.177b in 1966.
although first british designed thermonuclear weapon deployed, yellow sun not first deployed raf. mk-28 , mk-43 thermonuclear bombs , others had been supplied raf use in v bombers prior deployment of yellow sun. bombers of v-force ever used american weapons supplied under dual-key arrangements.
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