We have a range of 2, 3 and 4 blade bronze propellers availalable as well as 2 and 3 bladed aliminium propellers.
Aluminium Magnesium alloy propellers are worked with tollerances ISO 484 class 1°, dynamically balanced and painted in black color with a special epoxy powder which is axtremely hard and resistant to abrasion.
The opening operation is automatic and is caused by the centrifugal force, increasing according to the engine revolution. In forward gear the pressure on the blades allows a performance equal to the fixed-blades propeller.
During this opening phase a quick acceleration of the engine is not advisable, and we recommend to make it smoothly and gradually.
Even at low revolutions the centrifugal force is enough to opening the blades.
When the engine is off, a forward speed of 1 to 2 knots generates sufficient water pressure for the blades to close.
Reverse gear has always been the main problem for folding blades propellers.
Mainly due to the water pressure acting in opposition to the blades opening and the lack of a support point for the blades on the hub, only partially open, and the blades float, causing an unstable and insecure condition when maneuvering.
In order to avoid this inconvenience we studied and tested special blade sections that allow the blades to remain fully open during reverse operation with positive maneuvering results
Radice propellers for Sail Drive trasmission made with gravity die casting in a specific aluminium magnesium alloy. Our alloy guarantees greater corrosion resitance and thanks to its greater elaticity, if hit only the blade will deform without necessarly breaking.
Aluminium Magnesium alloy propellers are worked with tollerances ISO 484 class 1°, dynamically balanced and painted in black color with a special epoxy powder which is axtremely hard and resistant to abrasion.
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