Maintaining Depth with Silent Running

[Tikigod]

Anyone know if the sub is supposed to sink when in silent running over time? I advance time compression and it doesn't seem to sink. Also if I give order to surface it surfaces as well in silent running with engines at idle. Isn't the compressor supposed to be secured? Seems like you should see both the effects in long run if advancing time compression....take for instance following scenerios:

Order to Surface
-No Engines
-Silent Running
(Effect at x128: Sink slowly, compressed air remains the same)

Order to Surface
-No Engines
-Secured from Silent Running
(Effect at x128: should surface slowly, compressed air should slowly deplete)

Order to Maintain Current Depth
-No Engines
-Silent Running
(Effect at x128: should sink slowly, no change in compressed air)

Order to Maintain Current Depth
-No Engines
-Secured from Silent Running
(Effect at x128: Should Maintain Depth compressed air should VERY slowly deplete to simulate small adjustments to compensate with the dynamic motion of the sea)

Reason why this should be corrected....I notice this alot when I am bobbing up and down between venting sessions while on patrol in idle....I like to sit in front of enemy ports and act as a sleeping whale or dolphin and just bob up and down to get air while I wait and just listen for traffic. I noticed in time acceleration the behavior that doesn't coeincide with the above and was wondering if there is a fix for it.

[Letum]

if running too slowly for the dive planes to work real u-boats would either sink or float depending on how accurate the dive masters bayuancy was

[Deimos01]

Yoiu are correct. Real U-boats needed to maintain some forward velocity to maintain depth. If they took on too much water during a DC attack then they may be forced to increase speed to stay at depth dynamically. This behavior is not modeled in the game though.

[Redwine]

Discused many times in diferent forum, the info i remember is they need to maintain almost about 1 or 1/12 knots to ensure the dive planes works well enogh to maintain a determined depth properly.

But..... this not means they was not able to completelly stops the propellers, and adjust as well as they can their flotability and have a very slow rate of dive or surface.

I imagine in example, if they was at 50m depth, and they stops the propellers, and have a well adjusted flotability, then they start up to sink at slow rate, and may be they reach 250m after 20min, in example, then they can insuflate a little quantity of air in forward and after trim tanks, and start to surface at very slow rate and take another 20 min to reach 50m a new time.

I am not sure, and dont know if this was done in real life or not, but it is one of the futuristic sailing method in future submarines.
I read it in some articles, and to applied on a futuristic models of subs, which are very flat, very flat body sub.

[ref]

Originally Posted by Deimos01

Yoiu are correct. Real U-boats needed to maintain some forward velocity to maintain depth. If they took on too much water during a DC attack then they may be forced to increase speed to stay at depth dynamically. This behavior is not modeled in the game though.

I think it is , lost my first uboat this way, heavy flooding after being dc, the sub starts sinking at slow speed , finaly I've to order ahead full to mantain deep, try to escape surfaced, but they sunk me.

[Tikigod]

well, the behavior I know is from what I read on uboats...and from my experience in ocean while scuba diving....its very hard to maintain neutral bouyancy the deeper you go ....the closer you are to surface the less this effect.....its only difficult because of the wave action of the ocean ...any suttle movement up and down throws off your neutral bouancy to the point you need to dump air to descend or inflate your bouyancy compensator to rise....but for most part you stay soemwhat neutral.....the deeper you go the more you feel this effect for any up or down movement........at deeper depths just small amounts of air you dump makes you drop really fast....to ascend at deeper depths requires alot of air.....to start initital ascent....then as you rise you dump air to slow the ascent.......these effects are reduced the closer you are to surface. At surface you need to dump more air to drop and inflate less air to stabilize or climb......if you are on surface you have to dump alot to break the surface tension then after you are under you have to reinflate to compensate and resatabilize. There are certain effects that ar emodeled in the game...liek the large amounts of air to start ascent and then the faster ascent as you approach the surface......I to a degree see that....but, as far as descending I'm not sure you get heavier the deeper you go especially in silent running you should see this....and I don't......secured from silent runnign should simulate someone adjusting this constant dump and inflate to maintain depth.....once silent running order is issued this should stop and you should see effects of the water pressure around you push you down at deeper depths...especially if I change my depth with silent running I should feel a rapid descent if I go down or have trouble rising if Im jsut trying to use my planes....which I don't....so its like semi-modeled.....

[Ducimus]

In game, your boat will slowly sink at extreme depths.

In other words, the deeper you go, the faster you have to turn the screws to maintain depth.

This is most prominant in the IX boats. Its barely even noticeable in the VII boats.

As an experiment, make your crush depth like 275. Go down to 260 meters, go to silent running, and make your speed 2 kts to reduece RPM - hence run more quietly. Over short period time you will see your boat slowly lose depth. This is remedied by increasing speed.

Stay down there long enough, and you'll find the boat becomes less and less responsive to depth changing requests. At some point the only way to move topside is to put the boat at flank speed. I have been in a situation at least once where this didnt work, and i had to blow ballest. Whats neat, is watching the boat start to move forward at an incline (doesnt happen all the time), bow up, stern down, like its dogpaddling.

[Tikigod]

Wow...cool Ducimus thanks for the post...I will have to try that. How are you able to see that deep? Isn't it dark?

[Ducimus]

Try testing it on the U505 mission, with free cam enabled.

You cant see anything at night

[jimmie]

Originally Posted by Ducimus

In game, your boat will slowly sink at extreme depths.

In other words, the deeper you go, the faster you have to turn the screws to maintain depth.

This is most prominant in the IX boats. Its barely even noticeable in the VII boats.

As an experiment, make your crush depth like 275. Go down to 260 meters, go to silent running, and make your speed 2 kts to reduece RPM - hence run more quietly. Over short period time you will see your boat slowly lose depth. This is remedied by increasing speed.

Stay down there long enough, and you'll find the boat becomes less and less responsive to depth changing requests. At some point the only way to move topside is to put the boat at flank speed. I have been in a situation at least once where this didnt work, and i had to blow ballest. Whats neat, is watching the boat start to move forward at an incline (doesnt happen all the time), bow up, stern down, like its dogpaddling.

Are you sure? I've tried U505 mission, at about 230m the hull start getting damaged. Any shallower than 230m, nothing happens for no matter what (silent, stop, normal). Deeper than 230m, the boat getting damaged and flooding starts (not immediately visible) and I think that is the reason for dull responce or even sinking slowly...