Hello Ross I plead research not plagiarism!
Roy

Hi
With reference to Roy (2 of 6) I seem to recall that Model Boats back in the 90's had an and article on the water in a tube idea.
Fred

Barry, I did see another Seakeeper video where it was used on a smaller (not a model) boat. It was quite effective.

The "bobbing and rolling" is not that noticeable to the observer unless one is specifically looking for it. However, it is quite noticeable in videos when recorded close up (or zoom in) or with an on board camera.

Lew
Florida ⛱️, USA 🇺🇸

Roy, what I meant about "not spinning" was it rotated part way CW or CCW as a counterweight. The wheel looked like a ferris wheel on the deck with the axis running fore and aft. This could have been a simple weight transferring mechanism below the deck.

Lew
Florida ⛱️, USA 🇺🇸

Flying in a gyro copter I felt wind on my right shoulder. Expecting the craft to roll a bit I was ready on the stick. The roll never came. In an airplane it woukd move the wing n the stick movement compensates. Well like a dummy I wa ready. I said to instructor that was heavy wind but we didn’t budge. He says idiot it’s a GYRO copter. The gyro effect keeps it stable. On RC Helis I use a gyro to keep it stable. So if we use a RC airplane it heli gyro I guess it would keep it upright n not bothered by rolls. Anyone try it? On the Navy ship DE 1040 Garcia we had side fins to compensate the rolling. The gyro fir RC is small the size of a Rc receiver it has no moving parts. It works to control servos. So my point is if I have side fins controlled by servo and corrected by a RC gyro it should stabilize rolling? If I build a gyro that spins it woukd be larger n more complex. I’m wondering if a sailboat could use this technique best? What u think. Btw I’m surprised all motor full size boats don’t have that white box.

You might find this interesting.

Barry

Hi Lew, I seem to remember prior perhaps to RC that the 'straight runner' boats could use a spinning gyro. It assisted directional travel and was more steady.

You said in your post "not spinning" not sure what you mean?

As far as bobbing about, weight distribution can help. Think of a barbell in weight training. If you ballast a model towards the bow and stern there is less bobbing about. But there is a penalty in steering.

I have a yacht that relies on internal ballast and not a deep keel and this does not bob about.

Cruise ships have stabilisers and there is an electronic device that senses movement that could be used to operate stabiliser fins. I think model helicopters and submarines use it.

A cheap way I read about was to have a tank of water like a slightly lengthened coke can and fill to one third with water. It would have baffles inside to slow the transfer of water from one side to the other and mounted high up.
This causes a delay in the water transfer and does combat the boat movement.

Intriguing!
Roy