Type IXC range

Klaus_Doldinger · 10-13-07, 06:04 AM

Hello all.

Although usually I´m a Type VIIB-C Kaleun, this time I decided to try the US east coast in a Type IXC.

According to Uboat.net and U-Historia.com, Type IXC had a maximum range of 13.450 nm (approx 25.000 Km) at 10 Knots.

Departing from Lorient with the surrounds of Norfolk as patrol area (CA73) I have calculated that travelling between 3-5 knots my maximum range will be only of... more or less 8.100 nm, say more or less 15.000 Km!!

So I will must refuel at U-461 in my journey to home or... be lost at sea.

Any explanation, please?

Thanks.

papa_smurf · 10-13-07, 06:07 AM

Erm,, normally in a Type IX/C, I can travel to Norfolk and back with fuel to spare at 7kts.

Have you got malfunctions/sabotage on SH3 Commander enabled? (If you have it). As having malfunctions enabled, can affect you fuel efficency.

Klaus_Doldinger · 10-13-07, 06:18 AM

Yes, malfunctions enabled, but this is the second time I find the same problem. In my first patrol I reached Port Spain in the Caribbean and I found neccessary to refuel at Corrientes in Las Palmas. It´s true that bad weather makes you sail slower with the same fuel consumption, but sure my UBoot has an abnormally high fuel waste level.

Perhaps SH3 Commander hates me.

papa_smurf · 10-13-07, 06:24 AM

Thing is with malfunctions enabled, are that they are very random - different things can go wrong with you U-boat. i.e - fuel efficency, faulty scopes etc.

Maybe you bad mouthed Herr Doenitz in some way......

seafarer · 10-13-07, 08:21 AM

3-5 knots will not give you optimal range. 7-9 knots will maximize your available fuel. I've steamed over 20,000km in a IXC (Lorient to the Seychelles, and back, for example).

Brag · 10-13-07, 08:36 AM

Quote:

Originally Posted by seafarer

3-5 knots will not give you optimal range. 7-9 knots will maximize your available fuel. I've steamed over 20,000km in a IXC (Lorient to the Seychelles, and back, for example).

Yup, 7 knots is what will give you max range (your boat will slow down in rough seas).

Klaus_Doldinger · 10-13-07, 08:47 AM

Thanks to all

Penelope_Grey · 10-13-07, 08:55 AM

If you don't instal an engine upgrade you see the range on it then! wow!

U-96 · 10-13-07, 01:03 PM

Keep bernard off of your boat or else you'll end up with a boat with less range then a Canoe.

Klaus_Doldinger · 10-13-07, 05:02 PM

Quote:

Originally Posted by U-96

Keep bernard off of your boat or else you'll end up with a boat with less range then a Canoe.

But... (I´m mechanics incompetent), how it is possible that you get more range at higher speeds, you know, 7-9 knots being a suggested speed instead of 3-5 knots?
(As a seasoned VIIB-C Kaleun travelling not further from Iceland, fuel is not a problem for me)

Hartmann · 10-13-07, 05:52 PM

I reached US coast with a IX-B boat and i operated in the zone some days with the fuel at 50% surfacing at night and diving during the day.

seafarer · 10-13-07, 06:08 PM

Quote:

Originally Posted by Klaus_Doldinger

Quote:

Originally Posted by U-96

Keep bernard off of your boat or else you'll end up with a boat with less range then a Canoe.

But... (I´m mechanics incompetent), how it is possible that you get more range at higher speeds, you know, 7-9 knots being a suggested speed instead of 3-5 knots?
(As a seasoned VIIB-C Kaleun travelling not further from Iceland, fuel is not a problem for me)

Slower speed may slightly reduce the fuel consumed per unit time, but it will take much longer to cover a given distance, and so you burn more fuel over that time. If the speed is too high, the resistance of the water makes fuel consumption per unit time increase rapidly with increasing speed. You cover the distance in less time, but burn much more fuel per unit time, so total fuel consumption is again high. There is some optimal speed inbetween - see http://www.ussmissouri.com/speedVSFuel.aspx

P.S. and I have no idea how accurate or universal this is, but I always thought that the power needed to drive a ship (roughly) varies as the cube of velocity. So to go from 5 to 8 knots would require about 4.1x the power, but to go from 5 to 17 knots would take more than 39x the power. Or, something like that...what do I know. Damnit Jim, I'm a marine biologist not an engineer.

Klaus_Doldinger · 10-13-07, 07:11 PM

Quote:

Originally Posted by seafarer

Quote:

Originally Posted by Klaus_Doldinger

Quote:

Originally Posted by U-96

Keep bernard off of your boat or else you'll end up with a boat with less range then a Canoe.

But... (I´m mechanics incompetent), how it is possible that you get more range at higher speeds, you know, 7-9 knots being a suggested speed instead of 3-5 knots?
(As a seasoned VIIB-C Kaleun travelling not further from Iceland, fuel is not a problem for me)

Slower speed may slightly reduce the fuel consumed per unit time, but it will take much longer to cover a given distance, and so you burn more fuel over that time. If the speed is too high, the resistance of the water makes fuel consumption per unit time increase rapidly with increasing speed. You cover the distance in less time, but burn much more fuel per unit time, so total fuel consumption is again high. There is some optimal speed inbetween - see http://www.ussmissouri.com/speedVSFuel.aspx

P.S. and I have no idea how accurate or universal this is, but I always thought that the power needed to drive a ship (roughly) varies as the cube of velocity. So to go from 5 to 8 knots would require about 4.1x the power, but to go from 5 to 17 knots would take more than 39x the power. Or, something like that...what do I know. Damnit Jim, I'm a marine biologist not an engineer.

For me you´re an engineer. I´m only a ********** lawyer. Thank you!

Hartmann · 10-14-07, 01:51 AM

Based in the experience,the best speed is 9 knts for a IX-B boat, perhaps the same for a IX-C

10-13-07, 06:04 AM	#1
Klaus_Doldinger Planesman Join Date: Apr 2006 Location: Madrid, España Posts: 198 Downloads: 13 Uploads: 0	Type IXC range Hello all. Although usually I´m a Type VIIB-C Kaleun, this time I decided to try the US east coast in a Type IXC. According to Uboat.net and U-Historia.com, Type IXC had a maximum range of 13.450 nm (approx 25.000 Km) at 10 Knots. Departing from Lorient with the surrounds of Norfolk as patrol area (CA73) I have calculated that travelling between 3-5 knots my maximum range will be only of... more or less 8.100 nm, say more or less 15.000 Km!! So I will must refuel at U-461 in my journey to home or... be lost at sea. Any explanation, please? Thanks. __________________ OL zS. Siegfried Rollmann, U 108 in WaW IV, 6th war patrol with GWX 3.0 Gold (111.829 BRT) Lt zS Klaus Doldinger (U 36), 4th war patrol with GWX 3.0 Gold (50.713 BRT) SH3 Cmdr 3.1 GWX 3.0 GWX 16 Km atmosphere GWX no medals on crew GWX open hatch GWX Saint Nazaire, Schleuse and units OLC GUI 1.2.7 Thomsen´s sound Torpedo damage final Rubini´s lifeboats and debris D.i.D.

10-13-07, 06:18 AM	#3
Klaus_Doldinger Planesman Join Date: Apr 2006 Location: Madrid, España Posts: 198 Downloads: 13 Uploads: 0	Yes, malfunctions enabled, but this is the second time I find the same problem. In my first patrol I reached Port Spain in the Caribbean and I found neccessary to refuel at Corrientes in Las Palmas. It´s true that bad weather makes you sail slower with the same fuel consumption, but sure my UBoot has an abnormally high fuel waste level. Perhaps SH3 Commander hates me. __________________ OL zS. Siegfried Rollmann, U 108 in WaW IV, 6th war patrol with GWX 3.0 Gold (111.829 BRT) Lt zS Klaus Doldinger (U 36), 4th war patrol with GWX 3.0 Gold (50.713 BRT) SH3 Cmdr 3.1 GWX 3.0 GWX 16 Km atmosphere GWX no medals on crew GWX open hatch GWX Saint Nazaire, Schleuse and units OLC GUI 1.2.7 Thomsen´s sound Torpedo damage final Rubini´s lifeboats and debris D.i.D.

10-13-07, 08:21 AM	#5
seafarer Commodore Join Date: Feb 2005 Posts: 622 Downloads: 0 Uploads: 0	3-5 knots will not give you optimal range. 7-9 knots will maximize your available fuel. I've steamed over 20,000km in a IXC (Lorient to the Seychelles, and back, for example). __________________ My Father's ship, HMCS Waskesiu (K330), sank U257 on 02/24/1944 running SHIII-1.4 with GWX2.1 and SHIV-1.5 with TMO/RSRDC/PE3.3 under MS Vista Home Premium 32-bit SP1 ACER AMD Athlon 64x2 4800+, 4GB DDR2 RAM, 400GB SATA HD Antec TruePower Trio 650watt PSU BFG GeForce 8800GT/OC 512MB VRAM, Samsung 216BW widescreen (1680x1050) LCD

10-13-07, 08:47 AM	#7
Klaus_Doldinger Planesman Join Date: Apr 2006 Location: Madrid, España Posts: 198 Downloads: 13 Uploads: 0	Thanks to all __________________ OL zS. Siegfried Rollmann, U 108 in WaW IV, 6th war patrol with GWX 3.0 Gold (111.829 BRT) Lt zS Klaus Doldinger (U 36), 4th war patrol with GWX 3.0 Gold (50.713 BRT) SH3 Cmdr 3.1 GWX 3.0 GWX 16 Km atmosphere GWX no medals on crew GWX open hatch GWX Saint Nazaire, Schleuse and units OLC GUI 1.2.7 Thomsen´s sound Torpedo damage final Rubini´s lifeboats and debris D.i.D.

10-13-07, 08:55 AM	#8
Penelope_Grey Sea Lord Join Date: Feb 2007 Location: UK Posts: 1,893 Downloads: 0 Uploads: 0	If you don't instal an engine upgrade you see the range on it then! wow! __________________ I SURVIVED THE FIRST EVER SUBSIM WEREWOLF HUNT - and... I actually won the game for the humans too!

10-13-07, 06:07 AM	#2
papa_smurf Ocean Warrior Join Date: Jul 2007 Location: High Peak, Derbyshire Posts: 2,851 Downloads: 33 Uploads: 0	Erm,, normally in a Type IX/C, I can travel to Norfolk and back with fuel to spare at 7kts. Have you got malfunctions/sabotage on SH3 Commander enabled? (If you have it). As having malfunctions enabled, can affect you fuel efficency.

10-13-07, 06:24 AM	#4
papa_smurf Ocean Warrior Join Date: Jul 2007 Location: High Peak, Derbyshire Posts: 2,851 Downloads: 33 Uploads: 0	Thing is with malfunctions enabled, are that they are very random - different things can go wrong with you U-boat. i.e - fuel efficency, faulty scopes etc. Maybe you bad mouthed Herr Doenitz in some way......

10-13-07, 01:03 PM	#9
U-96 Mate Join Date: Sep 2007 Location: Montreal, Quebec, Canada Posts: 53 Downloads: 388 Uploads: 0	Keep bernard off of your boat or else you'll end up with a boat with less range then a Canoe. __________________ Because this boat is barely enough for the 50 men we already have. How many would you have rescued, 1? 10? 100? -Kptlt. Willenbrock (film: Das Boot)

10-13-07, 05:52 PM	#11
Hartmann Sea Lord Join Date: Mar 2005 Location: Grid CH 26, Spain ,Barcelona Posts: 1,857 Downloads: 204 Uploads: 0	I reached US coast with a IX-B boat and i operated in the zone some days with the fuel at 50% surfacing at night and diving during the day. __________________ But this ship can't sink!... She is made of iron, sir. I assure you, she can. and she will. It is a mathematical certainty. Strength and honor

10-14-07, 01:51 AM	#14
Hartmann Sea Lord Join Date: Mar 2005 Location: Grid CH 26, Spain ,Barcelona Posts: 1,857 Downloads: 204 Uploads: 0	Based in the experience,the best speed is 9 knts for a IX-B boat, perhaps the same for a IX-C __________________ But this ship can't sink!... She is made of iron, sir. I assure you, she can. and she will. It is a mathematical certainty. Strength and honor