Theoretical performance of a NH3/H-fuelled Patrol Hydrofoil Missile Ship (PHM) in 1975

Fuel weight 37.6 LT. Dimensions 118.5 x 24.7 x 6.1 x 8.6 (freeboard) feet. Range 550 (at 30 knots)-300 (at 55 knots) nautical miles.

Performance of a representative DFM-fuelled PHM in 1975. Dynamic lift ship representing a light hydrofoil, weight light 231 tons, dimensions 118 (waterline) x 24.6 (waterline) x 6.2 (ship draft) x 8.3 (ship freeboard) feet. Propulsion waterjet. Horsepower 20,000 hp. Maximum speed 55 knots. DFM fuel weight 41 LT. Cruising speed 30 knots. Range at cruising speed 1,350 nautical miles based on 10 percent fuel reserve rounded to nearest 50 nautical miles.

Patrol Hydrofoil Missile Ship (PHM) general applicable for the next specific warfare areas:

ASMD=self protection against anti-ship missiles

ASW (P)=force protection against subsurface threats

AAW=force attribution of airborne threats

ASUW=warfare against surface ship threats

EW=electronic warfare

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

SPW=special warfare

 

Principal mission characteristics

Mission: Sea Control SSM Engagement

Duration in day: 1.35

Range in nautical miles: 1,255

Mission description: high speed transit to operating ara. Six hour SSM engagement. Return to base at near max lift/drag speeds. Mission foilborne.

 

Ship operational parameters

Days in transit:

Transit day profile hours: 10

Transit day profile in knots: 50

Transit day profile in nautical miles: 500

Days in op area: 0.25

Op area day profile in hours: 3

Op area day profile in knots: 50

Op area day profile in nautical miles: 150

Total time at speed in hours: 16.7

Total time at speed in knots: 30

 

Ship operational parameters

Days in transit: 1.1

Transit day profile hours: 16.7

Transit day profile in knots: 30

Transit day profile in nautical miles: 500

Days in op area: 0.25

Op area day profile in hours: 3

Op area day profile in knots: 35

Op area day profile in nautical miles: 105

Total time at speed in hours: 3

Total time at speed in knots: 35

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