EasySternÂŽ CWS Propeller Shaft System
EasyStern® CWS Propeller Shaft Systems EasyStern® Closed Water Lubricated Propeller Shaft Systems are custom designed and engineered as a complete package. The systems are water lubricated (fresh water / glycol based coolant). By using two propeller shaft seals (inside- and outside the vessel) the system is closed and the liquid circulates through the entire system. Closed water lubricated propeller shaft systems have less total system wear and the shaft bearings have a longer life span compared to ‘open’ water lubricated propeller shaft systems, special in waters containing high levels of solids. The system requires an on-board lubrication tank and a circulation pump. Several key components of the closed water lubricated propeller shaft system have been awarded a Design Award METS (DAME).
meet the hull shape of the vessel involved. The brackets can be supplied in steel, stainless steel, aluminium or aluminium bronze. The section of the bracket profile is custom designed to guarantee minimal drag.
Stern tubes EasyStern® stern tubes are special designed to reduce noise and vibration levels on board and eliminates bearing alignment issues caused by welding (stress). EasyStern® ClampSeals are clamping and sealing the stern tube inside the outer tube and guarantee quick and easy stern tube installation. Closed water lubricated stern tubes are available in steel, stainless steel or aluminium bronze.
Propeller shafts Propeller shafts are designed and manufactured according to the applicable classification society rules and regulations. Both keyed and keyless versions can be supplied. The most widely used stainless steel grade is Duplex 1.4462 with a restricted chemical composition to ensure both added strength and corrosion resistance. Other stainless steel grades are available on request.
Custom Designed Propellers Our high skew propellers are custom designed to ensure optimal performance. The blade section and blade area ratio are optimized to minimise noise and vibration levels. Propeller blades are machined on CNC milling machines. Standard finish is according to ‘ISO Class I’ standard. Optionally we offer the most accurate possible finish according to ‘ISO Class S’ standard.
AxiSeal® shaft seals
Shaft brackets (optional) Shaft brackets (V, P or Y type) are custom designed to
The AxiSeal® is a dripless mechanical propeller shaft seal which uses ceramic (SiC) gliding rings for sealing. This sealing principle results in exceptional long service life. The AxiSeal® requires no regular maintenance. Optional available is the Standby Seal which can be used in case of emergencies and/or inspections.
Stern tube Composite bearing EasyStern® ClampSeal Standby Seal
Axiseal® shaft seal
Aft. Seal Housing The Aft. Seal is specially designed to fit the EasyStern® stern tube system and uses a triple JW lip-seal arrangement with integrated rope guard. The Aft. Seal is mounted onto the EasyStern® stern tube using a screw thread connection. Installation is quick and easy. In case inspection/replacement of the JW lip-seals is required, only dismounting the Aft. Seal cover will be sufficient. The Aft. Seal housing is of aluminium bronze and has a filling and draining connection. The Aft. seal comes with a duplex stainless steel wear sleeve to prevent shaft wear.
Thrust bearings and Flexible couplings Propeller thrust is absorbed by a heavy duty thrust bearing. Combined with a homokinetic (CV) shaft (Aquadrive) or high elastic flexible coupling and mounting the engine on soft engine mounts, optimal isolation of noise and vibration is achieved. A flexible coupling only (without thrust bearing) is a possible solution as well. Without a thrust bearing isolation of noise and vibration is less. The final choice depends on the yacht-owner requirements and available budget.
Calculations › › › ›
Shaft-alignment, Gap and Sac calculation Lateral vibration analyses Axial vibration analyses Torsional vibration analyses
Advantages of EasyStern® closed water lubricated Propeller Shaft System › › › › ›
Less total system wear Much longer bearing life span Low noise and vibration levels Fully custom engineered Complete design and suplly incl. lubrication tank and circulation pump › High performance
Blokland Non Ferro bv Blokland Non Ferro is a Dutch family business, founded in 1962 and active on the global marine market. The company specializes in designen, producing and supplying complete propulsion- and rudder systems for yachts and small commercial vessels as well as box coolers and heat exchangers for inland- and commercial vessels and industrial applications.
dependable quality player. We provide shipyard and naval architects around the world with our solutions. For (small) yachts as well as megayachts (both motor- and sailing yachts). Blokland Non Ferro also produces technical propulsion components and holds a comprehensive stock so that customers can be serviced promptly.
Blokland Non Ferro offers you the following services: With extended possibilities for design and production of our products we offer you an attractive combination of superior know-how, experience and production possibilities.
We offer two kind of propulsion systems:
›› Standard and custom designed propulsion- and rudder systems ›› Design and supply of box coolers and heat exchangers ›› Sales and distribution of technical marine equipment
›› Fixed pitch propeller system ›› Retractable propeller system
Blokland Non Ferro is committed to offer quality solutions and products only. Comfort and noise reduction are basic elements in our process of engineering.
With numerous national and international references Blokland Non Ferro has built a reputation of a highly
Blokland Non Ferro operates worldwide from its premises in Sliedrecht, The Netherlands.
Blokland Non Ferro bv Lelystraat 106, 3364 AJ Sliedrecht The Netherlands
+31 (0) 184 413 789 info@bloklandnonferro.nl www.bloklandnonferro.nl
Verkoop / Sales +31 (0) 184 420 015 sales@bloklandnonferro.nl