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However, in commercial ships and in traditional machinery arrangement, contra-rotating propellers are rare, due to cost and complexity. ABB provided an azimuth thruster for ShinNihonkai Ferries in form of the CRP Azipod , [ 2 ] claiming efficiency gains from the propeller (about 10% increase [ 3 ] ) and a simpler hull design.
Fouled propellers in Kort nozzles are much more difficult to clear than an "open" propeller. A research paper by Bexton et al. (2012) [6] concluded that ducted propellers were the likely cause of fatal injuries of seals in the northeastern Atlantic. The authors hypothesized that the seals were drawn through the nozzle and past the rotating ...
Powerfin produces carbon fiber two, three, four and five-bladed propellers for two-stroke and four-stroke engines up to the Rotax 914 of 115 hp (86 kW). [2] [4] [5] [6]The company is noted for its use of the Clark Y airfoil, infinite blade angle adjustment, as well as for the very low rotating inertia of its designs, a key wear factor on lightweight engine gearboxes.
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 ]
[clarification needed] The choice between using thrusters or traditional propellers to propel marine vessels is a compromise between versatility and efficiency. Propellers are designed to work in-line with a propulsion plant and produce one-directional thrust while thrusters are more customizable and have a more versatile application.
Vaquitas are not being hunted to extinction, but they are suffering collateral damage from fishing. The small porpoises get caught in fishing nets, called gillnets, meant to catch the endangered ...
The Voith Schneider propeller was originally a design for a hydro-electric turbine. [2] Its Austrian inventor, Ernst Schneider, had a chance meeting on a train with a manager at Voith's subsidiary St. Pölten works; this led to the turbine being investigated by Voith's engineers, who discovered that although it was no more efficient than other water turbines, Schneider's design worked well as ...
In the 1980s, the median home price in the U.S. was $47,200 ($170,000 adjusted for inflation). In 2025, the median home price is $400,000, and wages are failing to keep up.
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