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Propeller Design
All ships have individual needs. Speed is important for some ships. Towing pull is more important for others. To satisfy these needs Finnøy use the most suitable software together with Finnøys knowledge when designing propeller blades. The propeller blade is designed for best possible performance regarding thrust, efficiency, noise and vibration. The blades are ground and balanced according to ISO 484 standards.
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When using a controllable pitch propeller it is always possible to optimize the motor and propeller to current payload, wind and water resistance. The results are low fuel consumption and proper motor load, as well as good manoeuvering qualities.
Controllable pitch propellers are used for all types of boats, and usually have three or four blades. West Mekan calculates and produces these propellers in diameters of up to 1500mm, for speeds up to approximately 40 knots.
Fixed adjustable propellers with more or fewer blades can be specially designed.
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CP Propeller
The CP Propellers are manufactured from 1000 mm to 5000 mm in diameter. They are delivered with 3, 4 or 5 blades. The propeller hub and blades are manufactured in Ni.Al.-bronze. They can also be delivered in Stainless steel. The hydrodynamic blade design calculations are based on detailed analysis in computers together with Finnøys long experience.
The propeller shaft is hollow bored and made of carbon steel or stainless steel. The pitch is adjusted by the push pull rod. It transfers the axial force from the servo piston in the gearbox to the pitch setting mechanism in the propeller hub. The propeller hubs, type P26 to P48, are grease lubricated and from P39 to P125 are oil lubricated.
The stern tube is delivered complete with bearings, sealing boxes and a gravity tank for stern tube oil. The stern tube can be delivered suitable for either oil or water lubrication. The sealing boxes are Finnøys own design, but other types can also be supplied. The propeller shaft flange is a split type for the smaller shafts and an oil shrink type for the larger shafts.
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Helseth's product portfolio is made up of 3- and 4-bladed propellers designed with the help of modern tailor made computer programs, and manufactured in high quality materials.
All propeller blades are tailor made for each vessel and designed by use of top modern design software and experienced designers to fit the vessel perfectly. The propeller hub and pitch-control mechanisms are designed by use of top modern FEM-analysis tools to ensure low weights and sufficient strengths to survive the most hazardous environments.
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SCHOTTEL controllable-pitch propellers (SCP), manufactured by SCHOTTEL-Schiffsmaschinen GmbH (formerly WPM), are propulsion systems that can be used with almost any type of vessel. The power spectrum ranges from 600 kW to 30,000 kW, with propeller sizes varying between approximately 1.5 to 8.0 metres.
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Scana Volda manufactures controllable pitch (CP) propellers in the power range from 500 kW to 15.000 kW, with propeller diameters from approx. 2000 mm to 7500 mm. The hydrodynamic design of the propeller blades, preferably based on data from model tests of the vessel and adapted to the ship's service profile, ensures the customer's optimum overall efficiency of the vessel. Scana Volda's construction criteria are always based on minimum cavitation and lowest possible noise and vibration level.
Scana Volda CP Propellers comes in a wide range of design varieties:
Standard hub range from 520 - 1350 mm
Range of 4 bladed propellers
Controllable pitch propellers with the servo motor either in the gear, in the shaftline or in the propeller hub
Propellers are made from NiAl bronze or stainless steel
Blade design with high skew or normal skew blades
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Description:
-Hydraulically actuated Controllable Pitch Propeller.
-Suitable for all types of commercial vessels including fishing boats, tugs, ferries.
-Suitable for all types of government vessels, e.g. coastguard and defense craft.
-Well-proven design, highly reliable and simple to install.
-Compatible with all types of engines and transmissions.
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Controllable pitch (CP) propellers are the ideal choice for ships with frequent port calls as they provide excellent manoeuvrability, thus saving ship time and tug costs. Wärtsilä CP propellers guarantee superior propeller efficiency, reliability and minimum noise and vibration levels due to tailor-made designs with the latest available technology.
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A range of controllable pitch propellers is available with diameters up to approximately 8500 mm and rated for engine outputs of up to 30 000 kW.
MAN Diesel's advanced propeller blade design and calculation methods exploit the latest hydrodynamic theories and tank test results to create a propeller design that ensures maximum efficiency while maintaining low noise and low vibration characteristics.
Complete propulsion packages can be tailored to meet specific requirements by using these propellers in association with MAN Diesel two-stroke or four-stroke diesel engines and, where applications demand, reduction gearboxes.
The MAN Diesel two-stroke propeller as well as four-stroke propeller programme is presented in the Marine Engine IMO Tier I Programme as well as the Marine Engine IMO Tier II Programme.
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For decades, the MMG manufacturing program includes propeller blades for the most different purposes in use, as CPP propellers, build up propellers and POD drives for various typs of ships.
It will be precisely casted and manufactured according to the specifications and construction requirements of our customers.
Almost all noted manufacturers of CPP propellers in Europe and Asia are part of our clientele.
Long-standing experience in dealing with the most different constructions of propeller blades, efficient CAD technology, nonpolluting foundries, most up-to-date 5-axis CNC milling technology and the qualification of our employees are the guarantor for the 100 percent observance of the customer`s requirements in the respective construction of the propeller.
A taking over of the data files is possible, directly from the CAD programs of our customers into the MMG CAD-Sytem.
MMG supplies propeller blades of all sizes and designs.
An efficient technology in casting, measuring and machining as well as the long-standing experience of our employees safeguard the highest possible level of quality in all lines of production.
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Reliable, heavy duty mechanical hub design for high power density
Blade trunnions are supported in the hub in double journal bearings
Moderate oil pressures for pitch control, large servomotor piston
Small hub / propeller ratio
Low noise design
Low stresses, even load distribution
Superior hydrodynamics and hydroaccoustics
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For decades, the MMG manufacturing program includes propeller blades for the most different purposes in use, as CPP propellers, build up propellers and POD drives for various typs of ships.
It will be precisely casted and manufactured according to the specifications and construction requirements of our customers.
Almost all noted manufacturers of CPP propellers in Europe and Asia are part of our clientele.
Long-standing experience in dealing with the most different constructions of propeller blades, efficient CAD technology, nonpolluting foundries, most up-to-date 5-axis CNC milling technology and the qualification of our employees are the guarantor for the 100 percent observance of the customer`s requirements in the respective construction of the propeller.
A taking over of the data files is possible, directly from the CAD programs of our customers into the MMG CAD-Sytem.
MMG supplies propeller blades of all sizes and designs.
An efficient technology in casting, measuring and machining as well as the long-standing experience of our employees safeguard the highest possible level of quality in all lines of production.
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Controllable Pitch Propellers
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Autoprop is unique! This remarkable propeller can be found on thousands of sailing yachts the world over! Fitted to all the BT Challenge yachts, and tested in the most arduous conditions, Autoprops benefits for cruising yachts are unmatched by any other product. Considerably reduced drag can be expected from most feathering propellers but unlike ' the others' Autoprops exclusive design enables her shaped blades to automatically find the optimum pitch when motoring or motor sailing, ensuring excellent performance both ahead and astern, with virtually no 'prop walk'.
Faster motoring speeds for the same revs; better economy using lower revs at a yachts normal cruising speed; as much as one knot increase in sailing speed and a huge advantage when motor sailing, unachievable by any other feathering propeller: -
Autoprop automatically adopts the most efficient pitch setting, taking into account the driving force of the sails. The result is increased speed at lower revs, giving longer range and more comfortable cruising.
Too good to be true? There is lots more to be discovered on this web site about this great propeller range, which offers two and three blade versions plus one suitable for sail drives, and Autoprop sizes will accomodate any engine up to 350hp. To find out more follow the links below to download our brochure,fill in our enquiry form, view Autoprops own site or contact us directly using the details on our contact page.
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An innovative new propeller for sailing yachts ...
The Kiwiprop™ is a unique cost effective feathering propeller that eliminates gears, aligns the blades with the streamlines not the shaft, minimises corrosion potential from the lightweight composite blades and offers users easy variable pitch adjustment. In the Kiwiprop™ the individual blades are always free to "weather vane" in the actual water flow, to a minimum drag position so don't cause autorotation.
This modern light weight three bladed feathering propeller has proved much smoother and quieter in operation than equivalent two bladed units and offers the additional benefits of variable pitch, fully lubricated, minimal corrosion potential and the full reverse thrust.
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External pitch adjustment (no tools required for pitch adjustment), increased motor efficiency, very low drag under sail, legendary reverse, and great reliability.
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Very low drag, proven performance, unequalled reliability, outstanding reverse and internal adjustable pitch.
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Very low drag, proven performance, unequalled reliability, outstanding reverse and internal adjustable pitch.
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The Type FR is a fixed adjustable propeller, and is the best choice when you do not know which propeller is the best for your boat, when a suitable fixed propeller is hard to find, or when there are special requirements to the propeller.
The Type FR propeller is easily adjusted to optimum pitch using two wrenches. Adjusting the propeller to optimum pitch ensures a correct load on the motor, while also providing maximum power and fuel efficiency. In addition, the cost of a Type FR propeller is low compared to buying several fixed propellers in order to find the best one for your application. The Type FR propeller has approximately the same efficiency as a fixed propeller, in some cases even exceeding the fixed propeller's efficiency. When adjusted, it is used in the same way as a fixed propeller.
Fixed adjustable propellers are used for all types of boats, and usually have three or four blades. West Mekan calculates and produces these propellers in diameters of up to 1500mm, for speeds up to approximately 40 knots.
Fixed adjustable propellers with more or fewer blades can be specially designed.
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SCHOTTEL controllable-pitch propellers (SCP), manufactured by SCHOTTEL-Schiffsmaschinen GmbH (formerly WPM), are propulsion systems that can be used with almost any type of vessel. The power spectrum ranges from 600 kW to 30,000 kW, with propeller sizes varying between approximately 1.5 to 8.0 metres.
Advanced calculation methods allow the controllable-pitch propeller systems to be optimally adapted to the vessel’s hull form, thereby maximizing efficiency and minimizing noise generation.
The simple structure of the SCP guarantees a high level of user-friendliness, and the robust design keeps maintenance requirements to a minimum and ensures it a long service life.
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The Type FR is a fixed adjustable propeller, and is the best choice when you do not know which propeller is the best for your boat, when a suitable fixed propeller is hard to find, or when there are special requirements to the propeller.
The Type FR propeller is easily adjusted to optimum pitch using two wrenches. Adjusting the propeller to optimum pitch ensures a correct load on the motor, while also providing maximum power and fuel efficiency. In addition, the cost of a Type FR propeller is low compared to buying several fixed propellers in order to find the best one for your application. The Type FR propeller has approximately the same efficiency as a fixed propeller, in some cases even exceeding the fixed propeller's efficiency. When adjusted, it is used in the same way as a fixed propeller.
Fixed adjustable propellers are used for all types of boats, and usually have three or four blades. West Mekan calculates and produces these propellers in diameters of up to 1500mm, for speeds up to approximately 40 knots.
Fixed adjustable propellers with more or fewer blades can be specially designed.
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CONTROLLABLE PITCH PROPELLER FOR WORK BOAT. THE PROPELLER PITCH IS CONTROLLED BY AN HYDRAULICE CYLINDER INCORPORATED IN THE TRANSMISSION SHAFT EITHER ON THE GEARBOX OUTPUT OR BETWEEN THE PROPELLER SHAFT AND INTERMEDIATE SHAFT.
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