Witchard marine has been in the business of marine diesel engineering for the past thirty years and has been converting diesel engines for the purpose of marine engineering since the year nineteen hundred and ninety five. Marine engineering is the discipline concerned with the engineering design process of marine propulsion system. Diesel engines offered greater efficiency than steam engines. However now they have been replaced by the two strokes or four stroke diesel engines and gas turbines on faster ships.
Modern ships and what do they move on
Latest ships use diesel engine as their main mover. This was because of its robustness, fuel economy and simplicity in operating it. In this the propeller is coupled directly to the crankshaft that has slow speed engines. The revolution of the crankshaft is linked to the camshaft on a clever diesel. The first sea diesel engine came to use in the year nineteen thousand and three. It was then the diesel-electric river tanker was employed. As mentioned earlier diesel engines provided greater efficiency than steam engines. However it had a substandard power to space ratio for many years. The beginning of turbo engines quickened the usage of greater power densities.
The diesel engines of today are largely divided into two categories.
- Two strokes or four stroke engine
- Trunk, crosshead or contrasting piston.
The speed is also of three types
- The slow speed engine with peak running speed of three hundred rotations per minute. In fact, the largest and top level engines in the world are slow speed. They come as two-stroke crosshead diesel.
- The medium speed engine with a peak running speed of three hundred to nine hundred revolutions per minute. Latest four-stroke medium diesel engines have a maximum speed of five hundred revolutions per minute.
- High-speed engine with a peak running speed of nine hundred revolutions per minute
Size of Engines
Most modern ships use less speed two stroke engines or four-stroke medium speed trunk engines. Smaller vessels use top speed diesel engines. As size does matter the size of each type types of engine is a vital factor when selecting as to what will be equipped in the new ship. Some low-speed two-stroke engines are taller. However, the footprint needed is much smaller than to the same rated four strokes moderate speed diesel engine. Many ships tend to use multiple medium speed engines. This is because space above the waterline is a boon in passenger ships. By using multiple medium pace engines it results in a mantling loer engine room than that which is needed for a two-stroke diesel engine.
Most modern ship propellers are found to be very efficient at the running speed as they do not need gear boxes. Such thrust systems are made up of one or two propeller shafts and each of them has their self-direct drive engine. Ships that are moved by intermediate or high paced diesel engines have either a couple of propellers linked with a couple of engines driving each thrust shaft through a gear box.