Why cant anti singing edges be applied to all propellers from new?
They can but it would not prevent harmonics occurring as a propeller manufacturer has no way of defining if there will be a problem or at what rpm band it may become audible the anti singing edge is only applied after a sea trial uncovers the problem – in an effort to change the frequency. In most cases the problem is sorted out first time but in some vessels the anti singing edge simply moves the band up or down shorter or wider.
