Re: roller stabilizer or flopper stopper
I don't use these - I agree with Minnewaska and try to find a quieter anchorage or I lay a stern kedge and stay bow into the swell. Gentle rocking is way better than rolling.
But as far as small-boat stabilisers go, I've often thought about three buckets with most of the bottoms removed to form a frame then a plastic layer hinged in some way to let water flow upwards but not down (see HyLyte's device above). The buckets are then strung one under the other (think series drogue) and suspended off the side of the boat.
For stowage they simply pack one into the other and take up no more space than a single bucket and weigh next to nothing.
I think it may work but not on my boat which weighs 13 tons. When it wants to roll, it rolls.
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