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Old 07-04-2013
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Re: Is external rudder a good idea?

The outboard hung rudder can have one serious fault: at higher speed and when a boat is well heeled over such a rudder can easily 'ventilate' or 'suck air down along the lower pressure side of the rudder' and the rudder will/can lose ALL control depending on the amount of ventilation.

Couple this with a helmsman who doesnt understand 'weather helm' requiring more rudder angle to overcorrect for adverse helm; include the vulnerability to 'ventilate' ........ and you can expect an unexpected 'pirouette' / unexpected rounding up as a worst case scenario in your future.

Stern hung rudders can easily 'ventilate'.
Totally submerged rudders have great difficulty in 'ventilating'.
Advantage - submerged rudders
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