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Combined gas turbine and gas turbine (COGAG) is a type of propulsion system for ships using two gas turbines connected to a single propeller shaft. A gearbox and clutches allow either of the turbines to drive the shaft or both of them combined. Marine usage of COGAG systems are similar to those found ashore. [1]
The shaft connecting the gearbox to a rear differential is called a "propeller shaft", or "prop-shaft". A prop-shaft assembly consists of a propeller shaft, a slip joint and one or more universal joints. Where the engine and axles are separated from each other, as on four-wheel drive and rear-wheel drive vehicles, it is the propeller shaft that ...
The CODLAD propulsion system is based on the use of electric motors directly connected to the axes (generally two) of the propellers. The electric motors are powered by diesel generators and to have higher speeds, as happens in CODAD propulsion systems, the higher power diesel engine is inserted which is disconnected from the transmission system to return to cruising speed.
It is a preferred solution for vessels that employ pod-mounted propellers for precision positioning [21] or reducing general vibrations by highly flexible couplings. [ 22 ] [ 23 ] Diesel-electric provides flexibility to assign power output to applications on board, other than propulsion. [ 24 ]
Contra-rotating propellers have benefits when providing thrust in marine applications. Contra-rotating propellers are used on torpedoes due to the natural torque compensation and are also used in some motor boats. The cost of boring out the outer shafts and problems of mounting the inner shaft bearings are not worth pursuing in case of normal ...
In 1926 two German engineers, Dr Gustav Bauer and Hans Wach, had increased the efficiency of a triple expansion engine by adding a turbine driven by exhaust steam from the low-pressure cylinder, and adding the power from the turbine to the same propeller shaft via a fluid coupling and double-reduction gearing.
Rim–driven thruster, presented at SMM 2010 A rim-driven thruster mounted on a swing-out unit (design by silentdynamics GmbH) Voith rim thruster at SMM 2010 in Hamburg. The rim-driven thruster, also known as rim-driven propulsor/propeller (or RDP) is a novel type of electric propulsion unit for ships.
The difference between a saildrive and a Z-drive is that a saildrive's propeller shaft is fixed in place, pointing aft, whereas a Z-drive's propeller shaft can be rotated to any azimuth. Traditional sailboat transmissions consist of a simple horizontal output shaft extended rearward from the engine, through the stern via a stuffing box. The ...
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