It's interesting to hear about rudder
loss on catamarans. I personally know a sailor on a 48 foot South African Cat who lost
one rudder without knowing that it was gone until he went snorkeling. The boat handled normally with a single
In this instance, the manufacturer told them that the rudders were farmed out for production because they were behind on building the yacht and they didn't have time to do it themselves. The rudder had bad welds that allowed it to break off.
I know of a 42 foot french catamaran
that had two rudders with severe electrolysis
of the rudder posts, and they were replaced before the rudders broke off.
In this instance, it was galvanic corrosion
that destroyed the rudder posts.
Both of these rudder problems should never have happened. There's no excuse for shoddy workmanship, and no excuse for letting galvanic corrosion
get that far out of control.
I think if both rudders disappear simultaneously, there's manufacturing or maintenance
issues. Losing one rudder I can understand. But two rudders disappearing into the depths should never happen in a well maintained yacht.
If I lost both rudders, I would set up sheet to tiller steering
while sailing, and I would use the engines to change tacks and to steer the yacht when coming into harbor. Steering the yacht with throttles is a bit awkward, but it does work.
Catamarans have a lot of directional stability, and you should be able to balance your sails
in a manner that you can move your cat to location where you can fix the rudders. Then you steer with the engines or use your dingy as a tugboat to move the catamaran around in harbor.