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Rudder plating and the Chatter Groove

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A chatter groove was added to the trailing vertical end of the rudder to eliminate chatter felt back through to the steering mechanism due to flow turbulence in the water at the sharp change or loss of shape of the rudder.


I have seen some models with the chatter groove in the rudder.

I have seen models with plating wrapping around the rudder (over any chatter groove).


Did the copper plating conform to the profiled recess of the chatter groove, or was it no longer necessary because of the copper plating?

chatter groove.JPG

chatter groove 2.JPG

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Yes she was a replica with auxiliary power.


So copper plating formed into the groove.

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It is documented on british ships in several models and drawings/paintings. But no clue to me if used in real life or not, as other models and drawings of the same time omit it. Perhaps a fashion or test?


In opposition to french ships, the english ships had rudders that were more slimmed towards the aft edge. Perhaps this had the same effect.


As for my Vic of 1803 I decided not to show the groove as the contemporary rudder of the St George lost in 1811 in Thorsminde does not have one.









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