Type XXI Question

Sandman_28054 · 07-06-11, 10:07 AM

Just for kicks, I up-graded to the type 21 sub. Leaving port at flank speed, I can squeeze out 16 knts.

But shortly after leaving port, and upon entering the ocean, I am detected by Wellington or B-24's.

Crash dive to 70 meters.

Cruise at 7 knts for one hour, surface and order flank speed.

Once I have submerged, there goes the 16 knts.

The best I can squeexe out is 12-13 knts.

Is this normal?

Is this a bug?

Fubar2Niner · 07-06-11, 10:10 AM

Batteries recharging mebe?

Best regards.

Fubar2Niner

Osmium Steele · 07-06-11, 10:36 AM

Perfectly normal depending on sea state. 16 kn is correct for glassy seas, 12 - 13 is right for heavier seas.

The XXI is faster submerged than surfaced. At every bell, iirc.

The XXI was designed with a whole slough of advancements over previous designs, surfaced speed wasn't one of them.

And, as Fubar mentioned, charging the batteries slows the boat a bit.

Magic1111 · 07-06-11, 12:55 PM

Quote:

Originally Posted by Sandman_28054

Just for kicks, I up-graded to the type 21 sub. Leaving port at flank speed, I can squeeze out 16 knts.

But shortly after leaving port, and upon entering the ocean, I am detected by Wellington or B-24's.

Crash dive to 70 meters.

Cruise at 7 knts for one hour, surface and order flank speed.

Once I have submerged, there goes the 16 knts.

The best I can squeexe out is 12-13 knts.

Is this normal?

Is this a bug?

Hi Sandman !

Please read carefully: http://en.wikipedia.org/wiki/German_Type_XXI_submarine

Especially on the right side under "Speed" !

Best regards,
Magic

Sandman_28054 · 07-06-11, 01:03 PM

Quote:

Originally Posted by Osmium Steele

Perfectly normal depending on sea state. 16 kn is correct for glassy seas, 12 - 13 is right for heavier seas.

The XXI is faster submerged than surfaced. At every bell, iirc.

The XXI was designed with a whole slough of advancements over previous designs, surfaced speed wasn't one of them.

And, as Fubar mentioned, charging the batteries slows the boat a bit.

Thank you but I already know this.

Quote:

Originally Posted by Magic1111

Hi Sandman !

Please read carefully: http://en.wikipedia.org/wiki/German_Type_XXI_submarine

Especially on the right side under "Speed" !

Best regards,
Magic

From the wiki:

Quote:

Speed:Surfaced:
15.6 kn (28.9 km/h) (diesel)
17.9 kn (33.2 km/h) (electric)
Submerged:
17.2 kn (31.9 km/h) (electric)
6.1 kn (11.3 km/h) (silent running motors)

That still does not explain why when resurfacing speed will not return to 16 knts.

Wolfstriked · 07-06-11, 02:00 PM

Your running on one diesel on surface while the other diesel is relegated to recharging the batteries.Try telling the CO for standard propulsion and you'll see 16kts again.Whats wrong is that you must say this to the CO as it never switches back to standard....at least on my game.I was wondering for awhile why my fuel would drop so rapidly running at ahead slow.

frau kaleun · 07-06-11, 02:12 PM

Quote:

Originally Posted by Wolfstriked

Whats wrong is that you must say this to the CO as it never switches back to standard....at least on my game.I was wondering for awhile why my fuel would drop so rapidly running at ahead slow.

By "on my game" do you mean in general, or just with the Type XXI? Because in all the other types (I've never played a XXI) I've never had to tell the chief to do anything like that, when the batteries are fully charged we just go back to both diesels propelling the boat automatically with the expected increase in speed.

Jimbuna · 07-06-11, 02:38 PM

Quote:

Originally Posted by frau kaleun

By "on my game" do you mean in general, or just with the Type XXI? Because in all the other types (I've never played a XXI) I've never had to tell the chief to do anything like that, when the batteries are fully charged we just go back to both diesels propelling the boat automatically with the expected increase in speed.

Rgr that.

One possibility not yet mentioned:

Sabotage and Malfunctions 'SH3 Commander'...but highly unlikely.

frau kaleun · 07-06-11, 02:45 PM

Quote:

Originally Posted by jimbuna

Rgr that.

One possibility not yet mentioned:

Sabotage and Malfunctions 'SH3 Commander'...but highly unlikely.

That would've been my first thought if recharging batteries or rough weather are ruled out as possibilities.

But now I'm curious as to whether Wolfstriked's having his issue with just the XXI or all types.

Jimbuna · 07-06-11, 02:46 PM

Quote:

Originally Posted by frau kaleun

That would've been my first thought if recharging batteries or rough weather are ruled out as possibilities.

But now I'm curious as to whether Wolfstriked's having his issue with just the XXI or all types.

Good point

07-06-11, 10:07 AM	#1
Sandman_28054 Captain Join Date: Mar 2008 Posts: 547 Downloads: 279 Uploads: 0	Type XXI Question Just for kicks, I up-graded to the type 21 sub. Leaving port at flank speed, I can squeeze out 16 knts. But shortly after leaving port, and upon entering the ocean, I am detected by Wellington or B-24's. Crash dive to 70 meters. Cruise at 7 knts for one hour, surface and order flank speed. Once I have submerged, there goes the 16 knts. The best I can squeexe out is 12-13 knts. Is this normal? Is this a bug?

07-06-11, 10:36 AM	#3
Osmium Steele Ace of the Deep Join Date: Apr 2011 Location: Upper midwest USA Posts: 1,101 Downloads: 22 Uploads: 0	Perfectly normal depending on sea state. 16 kn is correct for glassy seas, 12 - 13 is right for heavier seas. The XXI is faster submerged than surfaced. At every bell, iirc. The XXI was designed with a whole slough of advancements over previous designs, surfaced speed wasn't one of them. And, as Fubar mentioned, charging the batteries slows the boat a bit. __________________ In the month of July of the year 1348, between the feasts of St. Benedict and of St. Swithin, a strange thing came upon England... My U297 build thread Last edited by Osmium Steele; 07-06-11 at 11:11 AM.

07-06-11, 10:10 AM	#2
Fubar2Niner Silent Hunter Join Date: Nov 2002 Location: London. UK Posts: 4,175 Downloads: 279 Uploads: 0	Batteries recharging mebe? Best regards. Fubar2Niner

07-06-11, 02:00 PM	#6
Wolfstriked Grey Wolf Join Date: Apr 2011 Posts: 756 Downloads: 237 Uploads: 0	Your running on one diesel on surface while the other diesel is relegated to recharging the batteries.Try telling the CO for standard propulsion and you'll see 16kts again.Whats wrong is that you must say this to the CO as it never switches back to standard....at least on my game.I was wondering for awhile why my fuel would drop so rapidly running at ahead slow.