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9.1.9 The ship’s requirement for manoeuvring ability and/or
slow-speed operation ......................... 266
9 . 1 . 10 Ease of installation ........................... 266
9.1.11 Vibration ................................ 267
9.1.12 Noise and other signatures ....................... 267
9.1.13 Availability .............................. 267
9.2 Alternative main engine types ......................... 267
9.2.1 Diesel engines ............................. 267
9.2.2 Slow-speed diesels .......................... 269
9.2.3 Medium-speed diesels ......................... 270
9.2.4 High-speed diesels ........................... 271
9.2.5 Gas turbines .............................. 271
9.2.6 Steam turbines ............................. 273
9.3 Propulsion systems ............................... 273
9.3.1 Direct drive .............................. 273
9.3.2 Geared drive .............................. 275
9.3.3 Electrical propulsion ......................... 275
9.4 Fuels ...................................... 277
9.4.1 General ................................ 277
9.4.2 Coal burning ships ........................... 277
9.4.2 Nuclear power ships .......................... 278
9.5 Auxiliary power ................................ 278
9.5.1 Electricity generation ......................... 278
9.5.2 Waste heat utilisation ......................... 278
9.5.3 Shaft-driven alternators ........................ 279
9.6 Other engine room auxiliaries and equipment ................. 281
9.6.1 Items specified and arranged by the marine engineer ......... 281
9.6.2 Items specified by the naval architect ................. 282
9.7 Other propulsion devices ............................ 283
9.7. I Wind power .............................. 283
9.7.2 Wave power .............................. 284
9.8 Fuel economy .................................. 284

Chapter 10 . Structural Design
10.1 Factors influencing structural design ...................... 287
10.1.2 Redundancy .............................. 288
10.1.3 The variety of structural calculations ................. 288
10.2 Longitudinal strength .............................. 290
10.2.2 Structural decisions based on longitudinal strength .......... 291
10.3 Special strength considerations for particular ship types ............ 292
10.3.1 Fast cargo ships ............................ 292
10.3.2 Large passenger ships ......................... 292
10.3.3 Warships . and more especially, frigates and corvettes ......... 293