With the ordering of the first 2 Typhon armed ships, the California class DLGN fitted with the AN/SPG-59, the new Typhon missile system was officially going to enter service in the USN. The complexity and cost of these ships however, was known to be considerable even in the early design stage. Not in the least this was because of the SPG-59 radar. The fact was, not enough Typhon cruisers and frigates were going to be build to fully exploit Typhons abilities in the fleet. The plan was that Typhon could be used by existing ships too, but without a refit this would offer next to no advantage over Terrier and Tartar. So, a second Typhon ship type was required by the USN. This ship would have to be considerably cheaper then the new California class design, which meant the new ship could not be nuclear. The ship would have to use existing or modified existing systems as much as possible, so it could be designed fast to enter service at the same time as the California class.
The ships were successful, but the system was not as capable as the SPG-59. This was not an real issue, as the ships were always meant to be an cheaper alternative, between 75% and 95% effectivity compared to the SPG-59 fitted ships (depending on conditions) was acceptable as the repeat ships costs were only 70% of that of the SPG-59 fitted DLGN's. 8 were build, of which the second series of 4 had their aft gun traded in for an small helicopter hangar, to give the ship more multirole capabilities. The first ship was commissioned in 1973, followed by two ships a year until the 8 were completed in 1977.
The DDG-47 had a length of 167.6m, a beam of 18.6m and a draft of 5.8m. The light ship displacement was 6600 ton and the ship was 8933 tons full load. The ship had an top speed of 30 knots and a range of 7500nm at 20 knots. She had a complement of 25 officers and 346 enlisted.
For more information and specifications: http://shipbucket.com/wiki/index.php/Typhon_DDG_47