Changes in the Fleet

Defense Industry Daily has an update on the status of the National Security Cutter (NSC) program. The seventh (Kimball) has been ordered and they report how the previously ordered cutters are progressing.

HII receives a $497 million fixed-price, incentive-fee contract from the U.S. Coast Guard to build WMSL 756, the 7th Legend Class National Security Cutter. Construction is expected to begin in January 2015, and delivery is scheduled for some time in 2018.

Ingalls has delivered the first 3 NSCs. WMSL 753 Hamilton is 81% complete and will deliver in Q3 2014; WMSL 754 James is 52% complete and will launch in April 2014; and WMSL 755 is scheduled for launch in the Q4 2015.  Sources: HII, “Ingalls Shipbuilding Awarded $497 Million Contract for Seventh U.S. Coast Guard National Security Cutter”.

Hamilton will be the first of two NSCs expected to be based in Charleston. Note the contract prices quoted are not the full cost of the ships.

Gallatin is being transferred to the Nigerian Navy, making this the second 378 transferred there. This leaves the Coast Guard with ten “high endurance cutters”, seven 378s and three NSCs, all on the West Coast.

The eighth Fast Response Cutter (FRC) has been commissioned and the ninth has been delivered.

 

Trade-offs in the 378 FRAM

File:USCGC Sherman WHEC-720 Vietnam War.jpg

Coast Guard photograph, PHC Ken Mather, USCGC Sherman (WHEC-720) in her original configuration with a 5″/38 and dual hedgehogs, April 1969. 

This is hardly a current topic, but it is one I have seen discussed several time, most recently in comments on a post about the new Canadian Arctic/Offshore Patrol Ship (AOPS), e.g. why the Coast Guard used the 76mm Mk75 gun on the 378 FRAMs rather than the 5″/54 Mk45.

It is true that, although about four tons heavier, the early model 5″/54 Mk45 mounts were a drop in replacement for the 5″/38 mounts we had on the 378s. It would have appeared an easy choice, but in order to accommodate the additional weight of the Harpoons and CIWS, perhaps the Coast Guard had no choice but to go with a lighter gun. That gun (and its associated firecontrol system) was certainly seen as a significant improvement over what we had had in essentially all respects including reduced manning and maintenance.

If we look at the weights as built that were removed:

one 5″/38 (20.5 tons) and two hedgehogs (14.4 tons), totalling approximately 35 tons

and compare that to some of the weights added

one 76 mm Mk75 gun (8.2 tons), two Mk141 quad harpoon launchers (11.8 tons total), eight Harpoon (6 tons), and a Mk 15 Phalanx CIWS (6.8 tons).  Total approximately 32.8 tons. Plus more weight for the addition of the hangar. Essentially the difference was a wash.

If instead, we had used the 5″/54 Mk45 mod 0 (24.5 tons) in addition to the harpoons and CIWS, the total weight would have been 16.3 tons higher or 49.1 tons.

There are other weights that might be added in calculating the total weight devoted to armaments, but obviously I don’t think this was an excessive amount, there are too many examples of smaller ships with far more weapons. I previously noted, (“OPC-Design for Wartime, Build for Peacetime”) that as built the little 255s had 140 to 150 tons of weapons.

Even so, an additional 16.3 tons topside (even if that is only about 0.5% of the full load displacement) might have been too much for the 378s. I don’t know. Perhaps a former 378 engineer or DCA could enlighten the discussion.

File:USCGC Mellon WHEC-717.jpgPhoto: Navy photo, USCGC Mellon, with 76mm, Harpoon, and Phalanx CIWS