Nice discussions!
Think the drum ‘outside’ is going to be in size comparable to the first generation of rob’s rudders – if not bigger – like on Visionary.
Keep in mind those rudders are fairly big – and to get the balance right the rudders have to be either angled or the moved about15-20% back (longitudinal? ) So the drum is big – not sure but would guess 60-100cm’s on Visionary.
Maybe you can reduce the size of the rudders if you go for additional leeway protection measures – but that stirs up the ‘additional boards question.
Browse back in the posts – there was a long discussion on multiple boards or a lee-board that could pivot. Rick W makes a point that against intuition and leeboard on the WW side of the lee hull would be most efficient.
I believe Arttu’s Ono visionary has added 2 boards to the original 2 rudders – and he has shared some comments on how this is working (but no protection against grounding)
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