Theoretical performance of a NH3/L-fuelled Amphibious Assault Ship (LHA) in 1975

Fuel weight 2,543 LT. Dimensions 794.5 x 98.7 x 26.3 x 56.9 (freeboard) feet. Range 4,350 (at 30 knots)-2,200 (at 50 knots) nautical miles.

Theoretical performance of a representative DFM-fuelled Amphibious Assault Ship (LHA) in 1975. Displacement light 40,000 tons and dimensions 794 (waterline) x (98.6 waterline) x 26.3 (ship draft) x 56.7 (ship freeboard) feet. Propulsion 2 screws. Horsepower 80,000 hp. Maximum speed 25 knots. DFM fuel weight 2,570 LT. Cruising speed 20 knots. Range at cruising speed 10,000 nautical miles based on 10 percent fuel reserve rounded to nearest 50 nautical miles.

Amphibious Assault Ship (LHA) general applicable for the next specific warfare areas:

ASMD=self protection against anti-ship missiles

AAW=force attribution of airborne threats

ASUW=warfare against surface ship threats

ARW=strike warfare using carrier-based tactical air

EW=electronic warfare

CAC=command, control and communication

CDS=combat direction systems

SURV=surveillance

AMW(L)=amhibious lift capability

NGFS=naval gunfire support

MIW=mine warfare

MLS=mobile logistic support for sea-based forces

Principal mission characteristics

Mission: projection amhibious lift

Duration in day: 25.5

Range in nautical miles: 10,000

Mission description: transit to/from amhibious objective area. Five days in op area. 20 knots speed of advance

Ship operational parameters

Days in transit: 20.5

Transit day profile hours: 2

Transit day profile in knots: 4

Transit day profile in nautical miles: 48

Days in op area: 5

Total time at speed in hours: 41

Total time at speed in knots: 24

Ship operational parameters

Days in transit: 20.5?

Transit day profile hours: 22

Transit day profile in knots: 20

Transit day profile in nautical miles: 440

Days in op area: 5?

Total time at speed in hours: 451

Total time at speed in knots: 20

Source

Hydrogen. Hearings before the subcommittee of energy research, development and demonstration of the committee on science and technology U.S. House of Representatives. Ninety-fourth congress, first session June 10 and 12, 1975, p. 1027 and further.