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SM-1MR has folding fins. ASROC does not seem to. Fin-span is 16.5 inches, which is seems Mk 26 could handle, but Mk 13 could not.Still, if they had wanted to put AASROC in the MK 13, folding fins would have been an easy modification. The bigger problem might have been that Mk 13 needed a fair bit of modification to handle nuclear weapons (hence the Mk 14 proposed for Typhon) including some way to access the missiles and unlock them from the rail (each rail had a key lock to positively retain a nuke until released). And the torpedo version of ASROC was not regarded as all that useful; the nuke was the decisive weapon.
SM-1MR has folding fins. ASROC does not seem to. Fin-span is 16.5 inches, which is seems Mk 26 could handle, but Mk 13 could not.
Still, if they had wanted to put AASROC in the MK 13, folding fins would have been an easy modification. The bigger problem might have been that Mk 13 needed a fair bit of modification to handle nuclear weapons (hence the Mk 14 proposed for Typhon) including some way to access the missiles and unlock them from the rail (each rail had a key lock to positively retain a nuke until released). And the torpedo version of ASROC was not regarded as all that useful; the nuke was the decisive weapon.