Propeller manufacture
Marine propellers

Propeller materials must have the following qualities:

• ease of manufacture (molding) ;

• good mechanical strength ;

• low marine corrosion ;

• resistance to erosion (cavitation in particular) ;

• dirt resistance ;

• ease of repair (metal supply in the event of damage).

Whereas around 1960, two-thirds of all propellers were made of HR (high-strength) brass, more precisely Cu + Zn + added...