I am using a drop rudder on my flying dutchman because of very shallow water for
100 metres offshore from our launch point.
The rudder vibrates very badly and a junior sailor commented unfavourably yesterday about "you got a motor on ther mister?".
What are th known causes of rudder flutter?
The fixed blade rudder has no such problem so I am discounting the centre board.
The blade has a 3mm flat tailing edge.
I am exploring the possibility of the following.
Preventing rotation of the blade itself in the two side ''cheeks''
Tightening the rudder blade pin so it will just move.
Sloppy pintol fitting on the pintol pins.
I would apprciate comments from anyone who might have some ideas and/or has cured a "singing" rudder before.