Paravanes
I agree with Twisted Tree. I have 6' NIADS on my Hatteras. They need about 4 sqft at the fins and 4 sqft at the tank and valving. There is also the drag of the blades to consider. My experience with semi- displacement boats under 40' is that they have a lot of primary stability which might be difficult to overcome with fins anyway. The cost last time I checked was about 45k for parts. A stay sail or paravanes might be more practical at slow speed. At planning speeds there should not be much roll as the ride firms up.
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