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Russia:
Project 667M "Yankee Sidecar," K-420 a Yankee-class SSBN converted to an SSGN
The Project 667M was intended to carry 12 Kh-80 supersonic cruise missiles in the massive bulge (the eponymous "sidecar") which was installed in place of the ballistic missiles amidships. Ultimately, the Kh-80 was cancelled in development.
K-420 was modernized in the early 80s to carry experimental 3M25N/SS-NX-24 Scorpion hypersonic SLCMs. Apart from the missiles the submarine received also new sonar system MGK-400 Rubikon replacing the old MGK-100 Kerch as well as other electronics upgrades. Torpedo tubes were modernized to launch URPK-6 Vodopad-PL/SS-N-16 Stallion anti-submarine guided missiles.
Project 667M "Yankee Sidecar," K-420 a Yankee-class SSBN converted to an SSGN
The Project 667M was intended to carry 12 Kh-80 supersonic cruise missiles in the massive bulge (the eponymous "sidecar") which was installed in place of the ballistic missiles amidships. Ultimately, the Kh-80 was cancelled in development.
K-420 was modernized in the early 80s to carry experimental 3M25N/SS-NX-24 Scorpion hypersonic SLCMs. Apart from the missiles the submarine received also new sonar system MGK-400 Rubikon replacing the old MGK-100 Kerch as well as other electronics upgrades. Torpedo tubes were modernized to launch URPK-6 Vodopad-PL/SS-N-16 Stallion anti-submarine guided missiles.