tonybarebones
Member
I have found out by chance that the noise coming from the region of my propeller could be caused by what is known as a "singing Propeller"... see below of the cure... /forums/images/graemlins/blush.gif
What makes a propeller "sing"? Some propellers produce an audible high-pitched tone which has come to be known as "singing". More of an annoyance than anything harmful, the hydrodynamics of singing have been a source of debate for decades.
The most widely-held opinion is that the tone is produced by alternating vortices which roll off of the trailing-edge of the blade. Singing is produced if the vortices develop into a well-behaved system (e.g., a continuous steady "train" of eddies) and the frequency of this "train" is in the audible range.
The most frequent cure for a singing propeller is the popular "anti-singing edge". This is a chamfer applied to the trailing-edge to promote separation of the vortices.
For a more indepth review of singing propellers, review the following HydroComp report: /forums/images/graemlins/smirk.gif
What makes a propeller "sing"? Some propellers produce an audible high-pitched tone which has come to be known as "singing". More of an annoyance than anything harmful, the hydrodynamics of singing have been a source of debate for decades.
The most widely-held opinion is that the tone is produced by alternating vortices which roll off of the trailing-edge of the blade. Singing is produced if the vortices develop into a well-behaved system (e.g., a continuous steady "train" of eddies) and the frequency of this "train" is in the audible range.
The most frequent cure for a singing propeller is the popular "anti-singing edge". This is a chamfer applied to the trailing-edge to promote separation of the vortices.
For a more indepth review of singing propellers, review the following HydroComp report: /forums/images/graemlins/smirk.gif