> You can do the same with twin rudders on a
> proa. You just need to be able to trim them relative to each other
> to minimise the overall drag on any point of sailing.
>It is VERY important to realise that they need to be able to have relative angle trimming.
there are two ways i see to do this: (1) have the two rudders independently controlled by two separate tillers/wheels. the helmsman would then statically fix the forward (or aft) rudder to counteract the leeway (locking it in position), and dynamically steer with the aft (or forward) one. or (2) the rudders could be linked together such that they countersteer, and the helmsman would have a separate control mechanism to adjust the average rudder angle for the leeway.
questions:
1. which is better in terms of performance?
2. visionarry and harry both have two wheels. do they just redundantly countersteer or do they control the rudders independently?
ben