Realistic Use of Flank Speed?

Schöneboom · 10-25-08, 01:14 PM

Guten Tag, Alle,

I recall in the ancient days of SH2 that one could not run at flank for very long without engine damage resulting -- the LI would warn about overheating, to give you a chance to reduce speed and prevent a breakdown.

Now that I'm chasing a faraway convoy with SH3's unbreakable engines, I'm thinking for the sake of realism, I ought to self-impose a time limit on the use of flank. Does anyone know how many hours is realistic? Four? Eight?

Vielen Dank!

Brag · 10-25-08, 02:59 PM

I think about an hour. The problem could be the shaft bearings overheating.

Graf Paper · 10-25-08, 08:07 PM

I agree with Brag. About one hour (maybe less or more) before the bearings overheat.

Of course, those German marine diesels are very durable so it may be we're both wrong. :hmm:

Any u-boat historians around that have a definitive answer?

PappyCain · 10-26-08, 09:22 AM

In RL Flank speed is hard on the engine and increases fuel consumption dramatically on any vessel. Should be used with discretion and maybe an hour. If you check, Flank speed you may not get more than a knot anyway. Boat hull design and hydrodynamics are a determinate too. In the sim there does not seem to be any penalty other than fuel burn rate.

S'

Kapt Z · 10-26-08, 11:37 AM

Quote:

Originally Posted by PappyCain

In RL Flank speed is hard on the engine and increases fuel consumption dramatically on any vessel. Should be used with discretion and maybe an hour. If you check, Flank speed you may not get more than a knot anyway. Boat hull design and hydrodynamics are a determinate too. In the sim there does not seem to be any penalty other than fuel burn rate.

S'

I'm no engineer, but that seems reasonable. It would be a nice feature for 'immersion' to have more penalties than just increased fuel consumption. Personally, I rarely use it unless I am evading or attacking on the surface.

Uncle Goose · 10-26-08, 01:00 PM

If U-boat diesels run too long the exhaust valves (which prevent the seawater to enter the diesels when submerged) will become corroded and might not seal anymore, therefore they had to file away the corrosions on a regular basis. IRL the LI or the chief of the diesel room had to check them and decide if they were still good enough. The corrosion could only be removed when the engine was stopped.

10-25-08, 01:14 PM	#1
Schöneboom Seasoned Skipper Join Date: Apr 2007 Location: San Francisco, CA Posts: 651 Downloads: 36 Uploads: 0	Realistic Use of Flank Speed? Guten Tag, Alle, I recall in the ancient days of SH2 that one could not run at flank for very long without engine damage resulting -- the LI would warn about overheating, to give you a chance to reduce speed and prevent a breakdown. Now that I'm chasing a faraway convoy with SH3's unbreakable engines, I'm thinking for the sake of realism, I ought to self-impose a time limit on the use of flank. Does anyone know how many hours is realistic? Four? Eight? Vielen Dank! __________________ Dietrich Schöneboom, U-431 "Es wird klappen, Herr Kaleun. Ganz sicher."

10-25-08, 02:59 PM	#2
Brag Navy Seal Join Date: Nov 2006 Location: Docked on a Russian pond Posts: 7,072 Downloads: 2 Uploads: 0	I think about an hour. The problem could be the shaft bearings overheating. __________________ Espionage, adventure, suspense, are just a click away Click here to look inside Brag's book: Amazon.com: Kingmaker: Alexey Braguine: Books Order Kingmaker here: http://www.subsim.com/store.html For Tactics visit:http://www.freewebs.com/kielman/

10-25-08, 08:07 PM	#3
Graf Paper Ace of the Deep Join Date: Jan 2008 Location: Pacific Northwest United States Posts: 1,146 Downloads: 41 Uploads: 2	I agree with Brag. About one hour (maybe less or more) before the bearings overheat. Of course, those German marine diesels are very durable so it may be we're both wrong. :hmm: Any u-boat historians around that have a definitive answer? __________________ Still sailing the high seas, hunting convoys with those who join me.

10-26-08, 09:22 AM	#4
PappyCain Samurai Navy Join Date: Aug 2008 Location: on the Atlantic Ocean Posts: 559 Downloads: 10 Uploads: 0	In RL Flank speed is hard on the engine and increases fuel consumption dramatically on any vessel. Should be used with discretion and maybe an hour. If you check, Flank speed you may not get more than a knot anyway. Boat hull design and hydrodynamics are a determinate too. In the sim there does not seem to be any penalty other than fuel burn rate. S' __________________ DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol: http://www.uboat.net/today.html

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10-26-08, 01:00 PM	#6
Uncle Goose Torpedoman Join Date: Dec 2007 Location: Belgium Posts: 113 Downloads: 1 Uploads: 0	If U-boat diesels run too long the exhaust valves (which prevent the seawater to enter the diesels when submerged) will become corroded and might not seal anymore, therefore they had to file away the corrosions on a regular basis. IRL the LI or the chief of the diesel room had to check them and decide if they were still good enough. The corrosion could only be removed when the engine was stopped.