👋 Good evening to the whole team,
Today I will report on the first improvement observation of roro pax Doggerbanke.
An important element that needs improvement is the response of the propeller during the manoeuvres of the boat.Such passenger ships usually have two variable pitch propellers. (In shipping, blade pitch is measured in the number of inches of forward propulsion through the water for one complete revolution of the propeller)
Α variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution. A controllable pitch propeller (CPP) can be efficient for the full range of rotational speeds and load conditions, since its pitch will be varied to absorb the maximum power that the engine is capable of producing. When fully loaded, a vessel will need more propulsion power than when empty. By varying the propeller blades to the optimal pitch, higher efficiency can be obtained, thus saving fuel. A vessel with a VPP can accelerate faster from a standstill and can decelerate much more effectively, making stopping quicker and safer. A CPP can also improve vessel maneuverability by directing a stronger flow of water onto the rudder.However, a fixed variable-pitch propeller (FVPP) is both cheaper and more robust than a CPP. Also, an FVPP is typically more efficient than a CPP for a single specific rotational speed and load condition. Accordingly, vessels that normally operate at a standard speed (such as large bulk carriers, tankers and container ships) will have an FVPP optimized for that speed. At the other extreme, a canal narrowboat will have a FVPP for two reasons: speed is limited to 4 mph (to protect the canal bank), and the propeller needs to be robust (when encountering underwater obstacles).
From the above we understand the benefits of a variable pitch propeller. In conclusion we can say that in a propeller with fixed pitch blades a ship needs more time to come upside down than a ship with a variable pitch propeller.I hope all the above analysis will help the team working on nautis to improve the response of the Doggerbanke during the manoeuvre. Support Team
