Battery while Surfaced?

Schlageter-JG26 · 03-25-07, 12:40 AM

Is there any way to make use of battery power while surfaced? My theory being that we could squeak out greater patrol range this way by saving fuel and using the battery to gain faster speed on the surface.

Is this possible? Or would this be a mod?

valpospe · 03-25-07, 12:50 AM

How exactly would this save fuel? I'm no thermodynamic expert but I would guess that the energy expeneded to recharge the batteries is more than the energy you get out of them. In other words, even if you could link the two systems to get greater speed or power or whatever, your batteries would eventually need to be recharged expending at least (and probably more) enegery (fuel) than just running diesel on the surface.

Rykaird · 03-25-07, 12:56 AM

Yes, it couldn't possibly be more efficient.

But, it would be realistic. In Werner's Iron Coffins they pretty much always pull away from the dock on electrics. He never says why, but it does come up a number of times.

Cakewalk · 03-25-07, 01:01 AM

It depends how they would have the diesels hooked up to the generators. If the diesel shafts simply ran through the electric motors and turned them while the diesels were running, then there would be no loss in effeciency.

In Silent Hunter 3, one of your engines would switch to turning over an electric motor inside the sub, leaving you with only one screw, thereby making it less effecient.

In SH4 though, both props keep turning while recharging, so it may be the case I stated above.

valpospe · 03-25-07, 01:16 AM

I haven't had enough time with the game to do in game testing. However, the fact that you can select to not charge the batteries while on the surface implies that it does take away power from the main diesels (like pto in a tractor or some kind of clutch) even thought both screws are turning (which I haven't verified). Either way, nothing regarding energy is free. I doubt they had the system set up turn the generators for recharging the battieries even when they didn't need to. It wouldn't make sense simply due to the resulting loss of efficiency it would create.

GoldenRivet · 03-25-07, 01:19 AM

there needs to be a mod for this in SH3 as well.

I have read in a few books that type VII skippers would often conduct surface attacks using the electric motors as they were quieter than diesels when stalking close in on a ship.

Ostfriese · 04-13-07, 09:13 AM

Quote:

Originally Posted by Cakewalk

It depends how they would have the diesels hooked up to the generators. If the diesel shafts simply ran through the electric motors and turned them while the diesels were running, then there would be no loss in effeciency.

Oh yes, there would be. If you withdraw energy on one side of the system (to charge batteries for example) you must put (at least) the same amount of energy into the system on the other side.

AVGWarhawk · 04-13-07, 09:19 AM

What we really need is the ability to shut down each diesel independanlty. Often the subs would patrol on one diesel to save fuel. Above and beyond that we need to be able to control speeds of each screw for tighter turning.

Drebbel · 03-25-07, 04:52 AM

Quote:

Originally Posted by Rykaird

Yes, it couldn't possibly be more efficient.

But, it would be realistic. In Werner's Iron Coffins they pretty much always pull away from the dock on electrics. He never says why, but it does come up a number of times.

Perhaps to keep smoke out of the eyes of the farewell party or not to fill the uboat penn with fumes

hyperion2206 · 03-25-07, 08:23 AM

Quote:

Originally Posted by Drebbel

Quote:

Originally Posted by Rykaird

Yes, it couldn't possibly be more efficient.

But, it would be realistic. In Werner's Iron Coffins they pretty much always pull away from the dock on electrics. He never says why, but it does come up a number of times.

Perhaps to keep smoke out of the eyes of the farewell party or not to fill the uboat penn with fumes

It's same reason why you must not let your car engine run in a garage, the fumes become deadly (at least when you're leaving a sub pen).

Dowly · 03-25-07, 08:29 AM

And same applies to running electrics while stalking close ships. The diesels generate small amounts of smoke + they are noisier.

Sgian Dubh · 03-25-07, 12:42 PM

Quote:

Originally Posted by Rykaird

Yes, it couldn't possibly be more efficient.

But, it would be realistic. In Werner's Iron Coffins they pretty much always pull away from the dock on electrics. He never says why, but it does come up a number of times.

Because there wasmuch less chance that electrics would arm an acoustic mine in the harbor.

MP · 04-13-07, 09:05 AM

Hi All,

Basically my sub is crippled about 80 miles outside the harbor in the Jawa Sea (pwned by a task force). My electric engines are repaired a functioning fully. My diesel engines are caput!
I tried going to periscope depth and my electric engines come online, but even though I have repaired all damage to the sub (diesel engines excluded), she sinks like a brick, and my electric engines just drive me deeper into the ocean floor.

Has anyone found a way to enable electric engines while on the surface, so I can limp home? There is nothing in the MOD release section.

Thx in advance

SingeDebile · 04-13-07, 05:59 PM

as was said before in terms of physics (maybe game is wrong) it is IMPOSSIBLE to get more range by charging and using your battery's... (you would be creating energy.. end of story) Not to mention the battery's they used back then were probobly not very effeicient. if you really wanted to get ultimate range and you had used some of your battery, by shutting down the battery recharge (no one mentioned you could do this?) you would get a better range... this is your best bet (and might actually be an option if you barely run submerged).

03-25-07, 12:40 AM	#1
Schlageter-JG26 Helmsman Join Date: May 2005 Posts: 107 Downloads: 31 Uploads: 0	Battery while Surfaced? Is there any way to make use of battery power while surfaced? My theory being that we could squeak out greater patrol range this way by saving fuel and using the battery to gain faster speed on the surface. Is this possible? Or would this be a mod?

04-13-07, 09:19 AM	#8
AVGWarhawk Lucky Jack Join Date: Jun 2005 Location: In a 1954 Buick. Posts: 28,255 Downloads: 90 Uploads: 0	What we really need is the ability to shut down each diesel independanlty. Often the subs would patrol on one diesel to save fuel. Above and beyond that we need to be able to control speeds of each screw for tighter turning. __________________ “You're painfully alive in a drugged and dying culture.” ― Richard Yates, Revolutionary Road

04-13-07, 09:05 AM	#13
MP Watch Join Date: Apr 2005 Location: NC Posts: 27 Downloads: 5 Uploads: 0	Hi All, Basically my sub is crippled about 80 miles outside the harbor in the Jawa Sea (pwned by a task force). My electric engines are repaired a functioning fully. My diesel engines are caput! I tried going to periscope depth and my electric engines come online, but even though I have repaired all damage to the sub (diesel engines excluded), she sinks like a brick, and my electric engines just drive me deeper into the ocean floor. Has anyone found a way to enable electric engines while on the surface, so I can limp home? There is nothing in the MOD release section. Thx in advance __________________ Win XP Home (In 32 BIT) AMD FX 64 4096 OCZ GOLD DDR RAM @ 400mhz 2 x ATI Radeon HD 2900 ASUS A8N32-SLI Mainboard 1TB HDD SATA 2 2 x Plextor Blu Ray Drives

04-13-07, 05:59 PM	#14
SingeDebile Seaman Join Date: Apr 2007 Posts: 33 Downloads: 0 Uploads: 0	as was said before in terms of physics (maybe game is wrong) it is IMPOSSIBLE to get more range by charging and using your battery's... (you would be creating energy.. end of story) Not to mention the battery's they used back then were probobly not very effeicient. if you really wanted to get ultimate range and you had used some of your battery, by shutting down the battery recharge (no one mentioned you could do this?) you would get a better range... this is your best bet (and might actually be an option if you barely run submerged). Last edited by SingeDebile; 04-13-07 at 06:32 PM.

03-25-07, 12:50 AM	#2
valpospe Watch Join Date: Apr 2005 Location: North of Chicago Posts: 16 Downloads: 1 Uploads: 0	How exactly would this save fuel? I'm no thermodynamic expert but I would guess that the energy expeneded to recharge the batteries is more than the energy you get out of them. In other words, even if you could link the two systems to get greater speed or power or whatever, your batteries would eventually need to be recharged expending at least (and probably more) enegery (fuel) than just running diesel on the surface.

03-25-07, 12:56 AM	#3
Rykaird Weps Join Date: Jan 2007 Posts: 356 Downloads: 36 Uploads: 0	Yes, it couldn't possibly be more efficient. But, it would be realistic. In Werner's Iron Coffins they pretty much always pull away from the dock on electrics. He never says why, but it does come up a number of times.

03-25-07, 01:01 AM	#4
Cakewalk Engineer Join Date: Mar 2007 Location: Ottawa, Canada Posts: 212 Downloads: 7 Uploads: 0	It depends how they would have the diesels hooked up to the generators. If the diesel shafts simply ran through the electric motors and turned them while the diesels were running, then there would be no loss in effeciency. In Silent Hunter 3, one of your engines would switch to turning over an electric motor inside the sub, leaving you with only one screw, thereby making it less effecient. In SH4 though, both props keep turning while recharging, so it may be the case I stated above.

03-25-07, 01:16 AM	#5
valpospe Watch Join Date: Apr 2005 Location: North of Chicago Posts: 16 Downloads: 1 Uploads: 0	I haven't had enough time with the game to do in game testing. However, the fact that you can select to not charge the batteries while on the surface implies that it does take away power from the main diesels (like pto in a tractor or some kind of clutch) even thought both screws are turning (which I haven't verified). Either way, nothing regarding energy is free. I doubt they had the system set up turn the generators for recharging the battieries even when they didn't need to. It wouldn't make sense simply due to the resulting loss of efficiency it would create.

03-25-07, 01:19 AM	#6
GoldenRivet Subsim Aviator Join Date: Mar 2007 Location: Texas Posts: 8,726 Downloads: 146 Uploads: 0	there needs to be a mod for this in SH3 as well. I have read in a few books that type VII skippers would often conduct surface attacks using the electric motors as they were quieter than diesels when stalking close in on a ship.

03-25-07, 08:29 AM	#11
Dowly Lucky Jack Join Date: Apr 2005 Location: Finland Posts: 25,052 Downloads: 32 Uploads: 0	And same applies to running electrics while stalking close ships. The diesels generate small amounts of smoke + they are noisier.