Hybrid Combined Propulsion Systems
| Designation | Cruise Power | Boost Power | Recent Application | Advantages |
|---|---|---|---|---|
| CODAD | Diesel | Diesel added | None | Simplifies logistics since only one type engine is used |
| CODAG | Diesel | Gas turbine added | Range of vessels from small patrol craft to destroyers | Diesels provide efficient cruise. Lightweight gas turbine provides fast transition to boost. |
| CODLAG | Diesel (with electric drive) | Gas turbine added | Royal Navy's new Type 23 frigate | Diesels provide efficient cruise. Gas turbine adds efficient boost |
| CODAS | Diesel | Conventional steam only | None | Diesel provides efficient cruise |
| COGAG | Gas turbine | Gas turbine added | DD-963-class destroyers FFG-7-class frigates CG-47-class cruisers DDG-51-class destroyers | Maintain fuel efficiency by using one gas turbine per shaft for cruise, two per shaft for boost |
| CODOG | Diesel | Gas turbine only | U.S. Navy's PEGASUS-class Hydrofoils. Various European destroyers and frigates. | Diesels provide efficient cruise. Gas turbines provide efficient boost. |
| COGOG | Gas turbine | Gas turbine (higher power) only | Royal Navy's Type 42 destroyers | Maintain fuel efficiency by using small gas turbine for cruise, larger gas turbine for boost |
| COGAS [aka RACER] | Gas turbine | Steam added | Proposed for DDG-51s and for refit on DD-963s | Uses heat in gas turbine exhaust to run boost steam plant, thereby increasing efficiency |
| CONAG | Nuclear steam | Gas turbine added | Proposed for aircraft carriers and cruisers | Nuclear plant needs to be sized for cruise only |
| CONAS | Nuclear steam | Conventional steam added | Soviet KIROV-class battle cruiser | Nuclear plant needs to be sized for cruise only |
| COSAG | Steam | Gas turbine added | Royal Navy's Type 82 and COUNTY-class destroyers | Steam plant needs to be sized for cruise only |
CO = combined A = and O = only | D = diesel G = gas turbine L = electric drive N = nuclear S = steam | |||
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