"Driftdown problem" (neg. buoyancy when submerged) addressed?

[BlackSpot]

Originally Posted by JamesT73J

It's not a morale / experience thing, is it? In Dangerous Waters, you need a little speed to maintain depth in some of the larger vessels. I quite like this feature; the 'hovering' behaviour is a bit naff.

Hmmm possibly. I'm using the morale mod and I'm not getting any drifting

[sergei]

Originally Posted by BlackSpot

Hmmm possibly. I'm using the morale mod and I'm not getting any drifting

Really. Which one? I'd like to try it out, but there are now a few available.

EDIT: I think you mean this one?
http://www.subsim.com/radioroom/down...o=file&id=1568

[elve84]

I would say its normal behavior for a sub, subs don't only use balast tanks for keeping debt, they also use there dive planes for this, as you hang stil in the water there is not water going over ya dive planes and thus ya can't maintain your debt. add that up with the balast tanks leaking and no working pumps because you as you are running silance. I would say it is normal that your boat "sinks" deeper.

As the Type VIIC is more modern, it could verry well be posible that german engeneers found a way to keep better debt with this ship. That would make the game more realistic in my opinion and historicaly correct.

[BlackSpot]

Yes Sergei, I just checked.
I tested the drift last night. Went down to @ 180 m it stayed steady even when using time compression x 32. Now, whether it's the mod effecting this, I can't say.

[Frederf]

Originally Posted by Rip

I don't think so. Mostly because as you noted as you descend the air compresses and you loose buoyancy.

I picked decks awash as an example since you're obviously not diving so it might be OK to have partial MBTs.

Originally Posted by thruster

I always thought that the U-boats were maintained intentionally a bit heavy. you couldn't stay stationary whilst submerged and still maintain your depth. i thought it was related to avoiding breaking the surface once the weight of the torpedo left the tube, or as fuel weight decreases as its burnt off, etc.

Buoyancy was maintained by continual weight management, ballast juggling and importantly for U-boat designs; forward momentum over the dive planes.

.....or have i missed something?

Read above posts, said basically as much and you're right. The difference between that and what SH5 does is a U-boat in real life settles a little bit to its trimmed depth which may be 10-20m below where it wanted to be with planes while SH5 will just settle and settle and settle and settle very, very deep.

Originally Posted by elve84

I would say its normal behavior for a sub, subs don't only use ballast tanks for keeping debt, they also use there dive planes for this, as you hang still in the water there is not water going over ya dive planes and thus ya can't maintain your debt. add that up with the ballast tanks leaking and no working pumps because you as you are running silence. I would say it is normal that your boat "sinks" deeper.

As the Type VIIC is more modern, it could very well be possible that German engineers found a way to keep better debt with this ship. That would make the game more realistic in my opinion and historically correct.

Settling is normal, settling 100m+ is not. Who says ballast tanks leak or that silent running is on?

[Kromus]

I found solution for this. Looked at VIIC values at goblin editor and tweaked them little bit for VIIB....

After you load everything you need (GR2 and sim files) look for:

unit_submarine
obj_hydro

change this:
mass to 620.8
surfaced displacement 629/draught4.55
submerged 730/draught6.4

With these values I could hold depth at 160m w/o moving!

I hope this helps a bit.

It definately needs more tweaking but I think it`s a good thing to start with.