How can i change the Sea handling Qualities of a Ship?

[LtzS_Petersen]

Hi!
I really enjoy the Fubuki Destroyer, but she doesnt really move in high Waves. So i looked at other Ships and their Values (with the Silent 3ditor) an try to change some, to get a better Movement. Unfortunately, i really dont know which Value does in influence which Movement.
Can somebody help me to find the needed Adjustment?

Seems o.k.:


To deep in the Water with the Stern:


Thx,
and please excuse my poor english.


Edit: Fist try Vickers Mod before change anything: http://www.subsim.com/radioroom/down...o=file&id=1433
He makes some Changes to reach the better SH3 Physics.
Than comes the vernier Adjustment.

[Jan Kyster]

how does she float in calm sea?

If she balance fine there, I'm afraid there's not much you can do... but if her behind is heavy (which I actually can't see is the case in the above picture), you can trim her balance through unit_ship.obj_hydro.debug.fr_ratio

[LtzS_Petersen]

Thanks, i will test it.
In Calm Sea everything is fine.
It seems to be a Problem between the Ship Movement and the Wave Movement. The Bow moves up (Stern down) and than comes the Wave. The high Bow avoid the Movement of the Stern and the Wave overrun the Ship from the Middle. This happens only at a certain Wave Height.
She moves to slow in the Waves, like a Battleship. I try to lower the Weight, but i cannot see any Effect of this.

Here a Video on Youtube, but with smaller Waves (Flak Mission):

Better than bevor, but not optimal.

Hope that is readable.

[Jan Kyster]

I think she floats and acts rather well in that video... nice one btw.! and great looking little ship!




You're running in what? 20 ft. waves? and with heavy weights in both ends compared to her tonnage, you will occational get that oscillating effect.
Looks convincing from here...

Silhoutte indicates a freeboard of some 2.2 to 2.5 meter along most of her hull, so you will get loads of "decks-awash" too...

If you want to alter her handling, there are values like drag up/down and weight/displacement to play with.



Please keep us updated - and welcome to the World of Modding!


/edit: found a (for me unknown) link with some nice stuff: http://www.friesian.com/destroy.htm

[LtzS_Petersen]

Originally Posted by Jan Kyster

Please keep us updated - and welcome to the World of Modding!

Hehe, thanks.
I will start a new try from Stock (my Uranami sunk in the Morning without Enemy contact , to much Gravity i think ) and test the Values systematically.

[LtzS_Petersen]

Ooookay, here she comes...


You need the S3D - Silent 3ditor from skwasjer to change anything:
The Fubuki.sim is in /playable DD Fubuki.../Data/submarine/NDD_Fubuki/



I changes the Mass of the Ship from 1680 -> 1730, this prevent the to long lasting Dive in High Waves. (i try the Mass of 500, she sinks like a Stone )

GC height from 2,8 -> 3,8, to let her more roll
fr ratio from 0,5 -> 0,4, prevent that the Stern ist to long under the Water
Drag:
LR: 0,25
UD: 0,05
Thats for the better Movement in the Waves.

Make a copy of the Fubuki.sim and rename it to Fubuki_old.sim bevor you change anything (its really better )
After every Change you must deactivate and activate the Fubuki Mod in JSGME, otherwise you see no Change.

Thanks to Xantrokoles for these fine Ship.

Video on Youtube:



its not final, but much more better than before. I think i can lower the Mass a little bit...

Edit: Now:
Mass 1720
fr ratio 0,43
UD 0,04
LR 0,27

At High Waves be carefully with Max Speed, this causes green Water on Deck (i dived 10m, but i could save her and our Lives ). Thats o.k., during my Navy Time at a german FPB we had the same Problem in the Bay of Biscay, at 18Knots.
Similar High Rudder during Max Speed, only 10° was allowed at the FPB. You can try more, but without warranty of the Shipyards.
See also http://en.wikipedia.org/wiki/Tomozuru_Incident

Last Changes:
Mass 1721
fr ratio 0,41
UD 0,03
LR 0,35
gc Height 3,5

Now its o.k. i think.