ELICHE RADICE®
For over 80 years ELICHE RADICE® has been designing and making propellers able to satisfy the needs of any kind of boat: fishing, pleasure or fast boats, small or medium tonnage ships, ferries, tug boats, hydrofoils, etc. ELICHE RADICE® is able to make propellers according to your design and design them “fit to measure”.
The range of ELICHE RADICE®’s standard series including 2 3 4 and 5 blade propellers up to a diameter of 4.0 meters. ELICHE RADICE® software manages a huge volume of constantly updated data based on experimentation with some of the most important research institutes determining all the parameters and propeller designs.
Bronze Propellers
Eliche Radice ® bronze propellers are premium, Italian-engineered marine propulsion systems designed for everything from leisure boats and sailing yachts to high-speed commercial vessels and heavy-duty workboats. Known for their high-precision manufacturing, they utilize specific high-grade alloy compositions—predominantly OTMAN (manganese bronze) and MIBRAL (aluminum bronze)—to deliver excellent structural strength, hydrodynamic efficiency, and corrosion resistance.
Key Technical Specifications & Features
Manufacturing Quality: All props are dynamically balanced to eliminate vibration and machined via precise CNC automated processing. Most models conform to strict ISO 484 Class 1° or 2° working tolerances.
- Boring & Taper Fits: Standard production includes factory-machined metric or imperial shaft tapers (such as the standard 1:10, 1:12, or 1:16 configurations) alongside matching keyslots.
- Sizing Availability: Standard series range up to 4 meters in diameter or 4 tons in weight, accommodating custom “fit to measure” commercial builds.
- Folding Mechanism: Their sailboat folding models rely on an automatic centrifugal opening system that cleanly synchronizes via integrated gearing, snapping shut under water pressure (at 1–2 knots) when the engine is cut to maximize sailing velocity.
| Propeller Model / Type | Blade Count | Primary Vessel / Application | Primary Vessel / Application |
|---|---|---|---|
|
Type K11 / Fixed Line |
2 Blades |
Sailing yachts, small displacement boats |
Low-speed / Drag-conscious setups |
|
Type E13 |
3 Blades |
Standard displacement & commercial fishing |
8 to 16 knots |
|
Type C7 |
3 Blades |
Semi-planing hulls, pleasure & planning boats |
17 to 30 knots |
|
Type B6 / B7 |
4 Blades |
Displacement and semi-planing workboats |
9 to 22 knots |
|
Type D10 / S8 |
4 Blades |
High-speed planning vessels |
25 to 35 knots |
|
Type S5 |
5 Blades |
High-performance planning & displacement |
10 to 30 knots |
|
Radice Geared Folding |
2 or 3 Blades |
Sailboats & Saildrive setups (reduces drag by ~90%) |
Sailboat cruising speeds |
Propeller and Nozzles
This type of propulsion system is particularly suited to working vessels (tow-boats, fishing boats, river bargers and pusher tugs) in the sea and on rivers.
The nozzles can be of two types: “Fixed” or “Rotating” (Steering Nozzles).
The main geometric parameters are the following:
- L/D ratio
D = Internal diameter of the nozzles, where the propeller is positioned
L = Nozzle length - Contraction ratio
This is the ratio between the point of water entry at the aft and the exit point at the stern - Section geometry
The advantages gained are the following:
- Reduction of propeller diameter;
- Reduction of propeller shaft and stern tube diameter
- Reduction in vibrations, expecially in the wider stern as the nozzle regulates the water flow
- Reduction in ship’s pitching when in rough waters
- Increase in the propeller thrust to the tow and to the Bollard-Pull
- Possible increase of ship speed by approx. 15%
- Better performance from heavily loaded propellers, especially in shallow water
- At the same conditions of speed, trawler work, Bollard-Pull, need 30% less power engine
- The smaller engine cost, the reduction of fuel consuption, the high-performance of trasmission
AAM MARINE PROPELLERS
Calculations
Choosing the right propeller is crucial for an efficient propulsion system, we specializes in propeller calculation. We can give you a solid, thorough advice on the right propeller in your specific situation.
Propellers Shapes & Sizes
We offer have a very wide range of propellers to choose from. We offer propellers:
– In almost any kind and for every application imaginable, varying from standard propellers to propellers for displacement, sailing or plaining vessels.
– In diameters measuring from 5″ up to almost 5 meters.
– In all known materials like Mn.Br, Ni.Al.Br. and stainless steel.
– With approval of various classi cation societies, e.g. LR, BV, ABS, DNV, GL etc.
These propellers are designed with CAD/CAM-technology and fabricated with CNC machines. This contributes to a higher efficiency, less vibrations, a lower noise level and less fuel consumption.
Free Rotation Of The Propeller
After the diameter of the propeller has been determined, it is very important to know whether this propeller can be fitted. To prevent vibration it is absolutely necessary to take into account certain clearances of the propeller. Clearance of the propeller needs to be 15% of the diameter of the propeller at the top and 4% at the bottom.
Efficiency Propellers
Type EP
They are made of manganese bronze (Mn.Br.). These propellers comply to the ISO 484/2 class II
tolerances and are dynamically balanced. We always keep 3B and 4B propellers in common dimensions
on stock, just to ensure you quick deliverance. In most situations Mn.Br. is a good material for propellers. But when it comes to aluminium vessels, we advise the use of a nickel aluminium bronze propeller. Manganese bronze contains up to 40% of zinc, which always causes galvanic problems when used with aluminium. Nickel aluminium bronze is free of zinc, so this will not cause any troubles. If there is a lot of cavitation, or if the engine is very powerful, we advise nickelaluminium bronze as well.