Cheap Seakeeper 5 for small boats launched....

[BartW]

I think the concept already exists in the
DMS "Antiroll" system,

http://www.dmsholland.com/stabilisatoren/antiroll/


re. DIY stabilising system,
yes today a lot of technology is easy acceseable,
my son here at home is experimenting with arduino boards, absolutely great what one can make at home,
and controlleable from a iphone, etc ...

but for a stabilising system,
one could make a system that works for a while,
but to make something really foolproove, and reliable in alle seastate conditions,
and submerged parts and gears that withstand the salty water for many years,
thats a biiiig challange (imho)

 

[rustybarge]

I think the concept already exists in the
DMS "Antiroll" system,

http://www.dmsholland.com/stabilisatoren/antiroll/

re. DIY stabilising system,
yes today a lot of technology is easy acceseable,
my son here at home is experimenting with arduino boards, absolutely great what one can make at home,
and controlleable from a iphone, etc ...

but for a stabilising system,
one could make a system that works for a while,
but to make something really foolproove, and reliable in alle seastate conditions,
and submerged parts and gears that withstand the salty water for many years,
thats a biiiig challange (imho)

I think you are correct; the programming of software using systems designed for other uses seems like it would be reasonably easy to achieve using smart phones/ games controllers/ drone gyros etc etc....

a good start to the engineering solution would be to buy a standard 'bat wings' trawler design that's hinges up, then adapt it to make it into an active system. i like the idea of putting hinged flaps onto the rear of the fixed bat wings, just like an aircraft wing with ailerons. This would make the engineering much simpler to achieve as they would be similar to standard boat trim tabs. A simple vertical actuation rod would bring the drive up to the deck level where the servos/hydraulic rams could be located.

regarding reliability, if there was a failure the bat wings could be locked in the fixed position.

 

[MapisM]

This video shows (from 1:50-2:07) the counterintuitive behaviour at work.

Nice video, thanks for the link.
I'm not buying the side effect of improving the boat tracking in following seas, though.
I don't think it can be perceivable, anyway - let alone as relevant as the guy in the video wants to sell us.
Glad to stand corrected if anyone has a different experience. Nick_H, wadduthink?

 

[rustybarge]

The anti roll system in post 41 is a very complex system, but looks very efficient. There's a lot of 'gubbins' under the water to go wrong.

the flapping system is pure genius; much better than the 'paddling' system of other zero active fins.

here's more of the details of the above: http://www.dmsholland.com/wp-content/uploads/2014/11/AntiRoll-Presentation-Mets-2014.pdf