Boat suspension

This is the link from Socalspearit thread :

I think company posted it more like s/f visualisation than real design.

 

"Servo Yachts", a California company, the land of fruits and nuts.
No more need be said.
I'd first thought it might be from some French "designers", you know, the guys who last week
were designing boudoirs for women.

 

Nauti-craft prototype,

 

I can't say anything bad about Nauticraft but Servo Yachts Martini 6.0 it shows fake kinematics .Movement of the floats is imposibble with this arrangment.

 

The hydraulic power required to achieve something like that would be massive.

 

Why do you say it is impossible, assuming a powered system?

 

The idea of independent pitch for a multihull is not new. This is a traditional Marshalese Walap:

regards

krzys

 

Check out the Nauticraft video that Barry linked from 3:10 . There's Quadramaran .
It's not possible to achieve movement of floats with two connected wishbones.

 

You think it was intended ? Filippino outrigers are also acting like springs . but it is the result of the materials used.

 

[TWO CREWMEMBERS ONBOARD]:

[CM1] "This isn't too bad, but what the heck is that noise?!"

[CM2] "Oh, you mean the $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$.$.$$.$$$.$$$$$ ..."

 

I am sure it was intended.
First, in Kiribati canoes with shorter amas, the connection is much simpler and stiffer.
Then, I sailed Pjoa by Janusz Ostrowski, with the same suspension, and experienced, how it works.

regards

krzys

 

If this is intentional then how did they determine the torsional stiffness which is constant and the sea waves are not always the same ?

 

If I understand correctly, the most important point here is the independent pitch of the ama. It is difficult for cats or tris with hulls flying, but easy in a Pacific proa. I think the range of reasonable flexibility is broad in this case. Certainly there was an empirical optimum for particular regions of the ocean, perhaps something could have been tuned with the position of the bars that cross the beams and by the strength of lashings, but it is not very important.
Janusz's Pjoa worked basically the same on the lake, bay and sea.
regards
krzys

 

It's interesting. I haven't read about it here before .
Seaworthiness was regulated by the size of the boat mainly .

As I mentioned above wide Filippino outrigers (tris) are flexible also.

 

They are. As the Indonesian outriggers. I've seen a drawing of Madura outrigger with a flexible fore beam and more stiff rear one, which on the other hand provided some yaw flexibility.
Of course, this is possible, when the most of the weight of the boat, and most of the lateral resistance, is provided by the main hull.
In Western tris, that can sail solely on the leeward float, the flexible suspension is much more problematic, if possible at all.
regards
krzys