Say hi to Lulu
Official caption: “Navy’s Atomic Depth Bomb Lulu. Lulu, is the nickname for the Navy’s atomic bomb displayed in the bomb bay of an S2F Tracker, while turning in flight, at Long Island, New York. Lulu is designed for fast accurate strikes against submarines by nearly all types of Navy aircraft. Its kill radius covers vast areas, giving enemy submarines a small chance of escape. The S2F, an anti-submarine warfare aircraft, also carries impressive underwing armament including four conventional acoustical-homing torpedoes and two high-velocity air rockets (HVARs). The photograph was released on December 30, 1960.”
Lulu was better known to the Navy as the Mk 101 Lulu. According to the Atomic Archive, it “was a small implosion-type nuclear depth bomb. The Lulu exploded at a depth and time that allowed the delivery aircraft to escape.”
Lulu carried the 11-kiloton W34 tactical nuclear warhead– which was also used on the Mark 45 ASTOR torpedo, and the Mark 105 Hotpoint nuclear bomb. When assembled, Lulu was just over 7-feet long, and weighed 1,200 pounds. It replaced the earlier Mark 90 “Betty,” a device some three feet longer that carried the 32-Kt Mark 7 warhead and was withdrawn from service by 1960.
Besides Trackers and SP-5A/SP-5B Marlin flying boats, it was tested on tactical fixed-wing aircraft, such as the Skyraider.
Lulu was also rated for use by ASW helicopters.
The Mk101 Lulu was fielded from 1958 through 1971 and, once it was withdrawn, the only ASW nukes left in the fleet were W44/W55-tipped ASROC/SUBROCs that continued to serve until 1989, at which point the Cold War was declared over and peace ensued.