[TEC] Help with sub draft

[jdkbph]

Hello,

I was wondering if anyone had a handle on how to adjust certain characteristics of a submarine, such as surfaced draft?

I found entries for this in both the CFG and the SIM file (using SH3minitweaker for the latter), but while they both seem to have some effect, it's just... instantaneous, is the only way I can describe it.

I tried setting the appropriate values in each of these files (one at a time of course) to a larger number... and the boat attempts to go to the desired depth when surfacing, but within a few seconds pops up to it's previous draft.

There must be another setting or factor that's affecting this that I'm missing. I noted that the surfaced displacement is a something that can be tweaked, but it's current value looks correct relative to it's submerged displacement so I didn't want to mess with it just yet. There's also the possibility that water density is something that has been or would need to be adjusted to affect this.

Lots of possibilities.... any help would be appreciated.

Oh, and in case anyone is wondering....

The reason I'm looking for this is because my modded installation (ROW + TM mainly) has the boat riding 18" or so too high over all and trimmed slightly down at the head. The effect is that the stern looks funny so high up out of the water.

Big deal? Not really... just me being anal :)

JD

[leovampire]

It cut's down on Prop noise that can be detected over a long distance by DD's having the sub's prop's lower in the water. Also it makes it easier for the sub to stay on the surface of the ocean and cut through the wave's rather than getting pushed under them.

[jdkbph]

It cut's down on Prop noise that can be detected over a long distance by DD's having the sub's prop's lower in the water. Also it makes it easier for the sub to stay on the surface of the ocean and cut through the wave's rather than getting pushed under them.


Hi LV. I think you misunderstood. I understand about cavitation and such. It's not that I think the sub is too low in the water... I think it is too high. In other words, too much freeboard. Interestingly - and this is just a side note - it appears that the relationship between center of buoyancy and center of gravity (aka, metacentric height) may actually be modeled here, as there seems to be an apparent effect from this on lateral stability.

Anyway... my opinion RE freeboard is based on numerous photos of Gato and Balao subs available on-line. If you look (eg, http://www.navsource.org) you'll find that what we have in SH4 with these mods applied is similar to what you might see when a boat is first launched or during trials (ie, considerably less than standard displacement), rather than what she would look like in an operational condition (somewhere between standard and full load displacement).

Near as I can tell, the difference is about 15" forward and 20" aft.... rough estimates of course.

And again, I'm not looking to stir up anything with the question... just trying to figure out how to make it look right to me.

JD

[leovampire]

I am using the Sargo right now anyways and she sit's low aft and high Bow. But I am working with the sim file right now in adjusting the Center Gravity and Boyancy in the sim file for the sub's.

But my reason for doing this is to get more movement out of the sub's as it travels along the ocean and deal's with differn't wave state's. Rather than just adjust the surface depth in the CFG file.

Usualy when someone ask's for more reaction from the sub I tell them to reduce the surface depth in the CFG file for the sub by 1ft so the wave's grab and push the sub around better.

[swdw]

Just a thought- is it possible the 3D model may not be lined up correctly with the physics model? Causes all kinds of headaches with flight sims when a mismatch occurs because the visual model and flight model don't line up correctly.

[leovampire]

Maybe if you used a 3d model editor and match up the corordinates with how they are set up in the game files you might find out if that is it.

That is how Kapitan_zur_see matched the under water bubble corordinate's up to the limber hole's in the DAt file for the sub's.