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

flakmonkey · 03-15-10, 06:24 PM

Quote:

Originally Posted by Sailor Steve

Way back in Aces Of The Deep you couldn't run silent forever, because the pumps had to run ocassionally to get rid of the water that always leaks into the boat. NYGM for SH3 replicated this with the 'Anti-Hummingbird' mod, so the boat would start to sink if you ran at two knots or less.

Is it possible that this behaviour was placed into SH5 intentionally?

I was going to say the same thing, i always hated being able to hover perfectly at any depth, and always concidered it a sh3/4 bug, so i was quite pleased to see it had been addressed in shv.. so you can imagine my surprise that people now think of it as a bug!!

Frederf · 03-15-10, 06:36 PM

Well it is a bug. Slowly sinking to the Earth's center is not normal real-life behavior. Sure, at periscope and you hit all stop and you sink a little. Either you'd drop down to a neutral buoyancy depth some small amount or you'd drop far enough that the engineer in charge or trim would do something about it.

Better behavior is settling a random (5-20m) depth below commanded when not under speed and some fluctuation over time as the engineer tries to fine tune the trim being very worried about breaking the surface.

U-Bones · 03-15-10, 06:54 PM

Quote:

Originally Posted by Frederf

Well it is a bug. Slowly sinking to the Earth's center is not normal real-life behavior. Sure, at periscope and you hit all stop and you sink a little. Either you'd drop down to a neutral buoyancy depth some small amount or you'd drop far enough that the engineer in charge or trim would do something about it.

Better behavior is settling a random (5-20m) depth below commanded when not under speed and some fluctuation over time as the engineer tries to fine tune the trim being very worried about breaking the surface.

I AGREE. All stop at any survivable depth should not result in free fall.

Silent running should slowly degrade your trim, and a certain amount of "slop" should be allowed in setting trim to the desired depth. But having to go over ahead slow to prevent sinking should only happen with flooding given the depths this game is played at.

senjorlossi · 03-15-10, 07:45 PM

That´s exactly what I mean.

L.G. Buchheim describes in "Das Boot" how the Chief is actually waiting for some DC explosions to break the silence and pump out some water.

Frederf · 03-15-10, 09:37 PM

I was going to ask if anyone knew at what depth point a Type VII would start to feel the limits of buoyancy. Is it 100m? 300m? 1000m? Maybe modern subs have sealed main ballast tanks but the WWII variety had permanently open bottoms like an upside down drinking glass so the volume of air contracts as the ambient sea pressure increases.

I hear now with SH5 we have a scripting system so depending on how powerful that is we can run a very sophisticated arrangement of depthkeeping. Perhaps we can even get to the point that we can tell our engineer how conservative to make his trim and torpedoes upset the balance when fired.

03-15-10, 07:45 PM	#4
senjorlossi Seaman Join Date: Jul 2005 Location: Germany Posts: 42 Downloads: 49 Uploads: 0	That´s exactly what I mean. L.G. Buchheim describes in "Das Boot" how the Chief is actually waiting for some DC explosions to break the silence and pump out some water. __________________ Best regards, Stefan.

03-15-10, 06:36 PM	#2
Frederf Seasoned Skipper Join Date: Apr 2005 Posts: 665 Downloads: 79 Uploads: 1	Well it is a bug. Slowly sinking to the Earth's center is not normal real-life behavior. Sure, at periscope and you hit all stop and you sink a little. Either you'd drop down to a neutral buoyancy depth some small amount or you'd drop far enough that the engineer in charge or trim would do something about it. Better behavior is settling a random (5-20m) depth below commanded when not under speed and some fluctuation over time as the engineer tries to fine tune the trim being very worried about breaking the surface.

03-15-10, 09:37 PM	#5
Frederf Seasoned Skipper Join Date: Apr 2005 Posts: 665 Downloads: 79 Uploads: 1	I was going to ask if anyone knew at what depth point a Type VII would start to feel the limits of buoyancy. Is it 100m? 300m? 1000m? Maybe modern subs have sealed main ballast tanks but the WWII variety had permanently open bottoms like an upside down drinking glass so the volume of air contracts as the ambient sea pressure increases. I hear now with SH5 we have a scripting system so depending on how powerful that is we can run a very sophisticated arrangement of depthkeeping. Perhaps we can even get to the point that we can tell our engineer how conservative to make his trim and torpedoes upset the balance when fired.