I am not so sure. As far I have read with a boat not fitted with superchargers stage 1 and 2 took 6.2 hours at about 5 knots while using the snorkel. The third stage, from 90% to full, an other 2.4 hours (though whether snorting at 5 knots as previously or with all power available I am not sure, it was done every now and then mostly to preserve battery life anyway). So in total 8.6 hours to go from 10% charge to 100%.

Excerpts from captured type XXI trials:
The vessels in U.S. custody as well as numerous other type XXI submarines had their supercharger removed. The precise reason for its removal is not known. Whatever it was that caused the Germans to take this drastic step brought about a serious decrease in diesel power available and a resultant serious unbalance in the machinery plant. A possible reason lies in the damage that would be caused to the exhaust gas turbine should it receive a slug of water during snorkel operation. However, the exhaust gas driven blower on the 9 cylinder MAN engine on type IX submarine was not removed when the snorkel was installed, so that this reason for its removal is not conclusive.
The attempt by the Germans to provide a high powered, small size diesel engine for the proposed operation of the XXI submarines that could use interchangeable parts from the 9 cylinder MAN engine proved a failure and created a serious weakness in the vessel as finally delivered. The forced removal of the exhaust gas driven supercharger from the engine decreased the useful output of the engine by nearly half the original designed rating. Furthermore, the engine, on test, both with and without the supercharger, was limited in output below designed ratings by excessively high exhaust temperatures which exceed those permitted in US submarine practice by 350° F., have created trouble in all exhaust valves as they are not suitably designed to take this temperature.
The basic design (on which German trial data is available) incorporated a large battery of 372 cells, two 2470 HP (2500 PS) main motors, two 111 HP creeping motors and two supercharged 1970 HP (2000 PS) diesel engines. The main motor and diesel engine on each side are separately geared to the main shaft while the creeping motor is connected to it by a V-belt drive. Adequate clutches are provided to give maximum flexibility in the use of this arrangement.
On trial runs the propulsion motors developed their rated power. When using the main motors, submerged speed in excess of 16 knots were obtained. It should be possible to maintain this speed during a one hour battery discharge. Surface and submerged speeds up to 6 knots have been obtained when running on the creeping motors. The cruising range based on one battery discharge is 365 miles at 5 knots or 110 miles at 10 knots.
The diesel engines, on the contrary, have proved a major weakness in the vessel's design. On actual trials the output was limited to 1700 HP (15 knots) by excessive exhaust gas temperatures. Furthermore, the exhaust driven supercharger when used during snorkelling operations proved hazardous and was subsequently removed. The diesel without supercharger is able to operate only with snorkel cams in, with a resultant limiting output of 850 HP (12 knots) before excessive exhaust temperatures are reached. As it is necessary to furnish approximately 1200 HP for 4 hours to the generators for charging each of the two batteries at the normal charging rate, the time required for a full charge is excessive. This necessarily places a major handicap on the vessel's operation and decreases the value of the higher submerged speeds.

Hi guys and thanks for both replies :know:. With my settings all another possible batterry recharging time changes are still simple.:yep: All we need to do is increase values in this lines via s3d:
3.
unit_Submarine-->Ranges-->Submerged:
miles=240,0
knots=4,0

...for bigger underwater XXI range by increase miles line, or knots or both lines.:salute:
This one thing can be safe change in base between patrols.:yep:
************************************************** **
If someone have more info about XXI, or know something more about recharging battery times of this Boat, please write.

The design study for the type XXI can be found here . Focus is on design rather than performance figures but it does provide some elements.
Charging was done in stages (as in the others u-boats)
1) 10-60%
2) 60-90%
3) 90-100%
As far as it can be found online each stage would probably take about two hours and half under ideal conditions (including a stationary boat) and a bit more than three hours in actual practice with the snorkel.I have not read primary sources about this specific issue however, just quotes.Note that charging time would be non linear (not a Type XXI exclusive feature of course, just basic battery mechanics), I do not know if the game can simulate this.
In addition it seems that the usual charge mode would have been using both diesels to drive the main motors as generators and using the creep motors for propulsion. In the game you are stuck with the one engine used for propulsion and the other for generation mode, which was the usual (though not the only possible) method for earlier u-boats.

Thanks. I didn't read everything from that page erlier.
After few in game tests on: miles=280,0 knots=4,0 [everything else is set up like in first post]
12 -14 h at 6kt, [underwater range near 190km] Then 6,5h for recharging.
At 4 kt - 418km [2-3 days underwater].
About 32km underwater range at 12kt, at 3kt 520km+:ping:
So for 7h+ recharging time, miles could be set for 300,0 - 330,0. at 4 knots.:shucks:
One thing is also importatnt here. Batteries power [Cfg basic file].
I use stock settings.

Edit: Sorry. I used batteries AFA27MAK800 set for 1.0.
So for model AFA44MAL740 with stock Energy 1.25, range and recharge time on my settings will be longer.

Yes I know my dream, but is not possible in sh3. Like I said befeore in first post;
These new settings means the best balance between range, battery recharging time, and noise emisive by XXI - at least for me. XXI ability to staying as silent as possible should be very important. However, I newer tested it with GWX. Now XXI is about 16,7% easier to detect
than vanila XXI. But we can't skip this, if we need to recharge batteries on time.

Translation of German Tests some of the most important data as these were from different boats tested in the baltic to give wartime procedure for the type xxi.
The snorkel system had a relatively large water resistance due to its two circular tubes. Since in the range of 6.5 to 8.5 kn appeared strong vibrations, only speed steps from 0 to 5.5 were for their operation kn (battery charging) and 9 to 10.5 knots ( cruising ) allowed.
The tall boot made ​​a very large valve overlap of 150 ° necessary, which resulted in an increased back pressure sensitivity. This could go as far back in snorkel trip the supercharging that motor performance remained strong standing plummeted and the motor in unfavorable cases. On the control shaft therefore a second valve cam kit (snorkel setting) was attached, the reduced valve overlap. Thus, the diesel power went to 2 × 1400 hp = 2 × 1030 kW at 470 min -1 and the charger was only 10,000 min -1 U 3503 scored at snorkel trip with two diesel engines, 395 min -1 engine rpm and 7500 rpm. - 1 charger speed, a speed of 10.4 knots.
The decrease in the diesel performance snorkel trip was a significant problem, because this took the battery charge, 6.2 hours from 10 to 90% state of charge relatively long.
The board practice showed that the previous snorkelling performance could be achieved without charging. Since the above-water properties were subordinated, was abandoned in later versions on the installation of the turbocharger. The maximum power diesel with snorkel was then 2 x 1200 hp = 2 × 883 kW at 10.9 knots. In practice, however 6 knots could hardly be exceeded because of the periscope and snorkelling oscillations.
THIS NEXT SECTION IS VERY IMPORTANT!
It has been calculated that every 24 hours 3 hours battery charge with snorkel were sufficient at 5 knots submerged cruising with slow (CREEP MOTORS )motors to maintain the state of charge between 60 and 90%. Because the diesel power with battery charging only 2 × 1050 hp = 2 × amounted to 772 kW at snorkel trip, recharging a discharged down to 10% battery (drive with creep speed engines) until completion of the second loading stage lasted about 6 kn (90% charge) 6.2 hours. In trials at the pier (shore power was possible), however, load times were reached 2.5 hours for the first two stages of charging. For the third loading stage (up 100%), which was necessary to maintain the capacity at certain time intervals, it was expected further 2.4 hours charging time, what a full charge time of 8.6 hours gives in snorkel trip. ( the batteries were tied in series and this included sub-batteries for silent running therefore three stages for charging )
Recharging the port or starboard part batteries could only row effected. Separate recharging of individual sub-batteries was not possible. Therefore, the power requirement of the auxiliary machines had to be distributed to the sub-batteries tuned in operation. Normal recharging started in the first charging stage with a current strength of 2040 A according to a charging voltage of 2 × 446 V = 2.40 volts per cell. In the second loading stage, the current intensity decreased at a constant voltage at 510 A. In the third loading stage was loaded with constant current up to 510 A at a voltage of 2.7 volts per cell.
This data is in the german language and translated via google translator.
another interesting link: http://www.u552.de/german/docs/TypXXI/TypXXI.htm

I would have guessed so. What's the mileage at 10 knots?

Hi again Marcello. The problem with XXI in sh3 is known from a long time. I tested XXI on many diffrent settings through 5 years. In Vanila sh3 XXI diesel power is set for 4500, electric engine for 5000. Vanila underwater range for XXI = 285 Nm at 6 kt. So 285 x one Nm [1.852km]= 527km underwater range for XXI at 6 kt in vanila sh3. But in vanila, recharging batteries from 10% - 100% take abot 12h, maybe more, never reach end. On stock settings when the diesel is less strong than electric engine 4500/5000 electric, even with fix for battery recharged full from 0 - 100% of power, batteries never recharged to the end. The diesel should be set for minimum 5000 or other value, but at least for the same value [not less value than electric engine] like electric engine for recharging batteries to the end. But 5000 diesel power, and 5000, electric power gives still to long baterry recharging time for XXI in sh3. Still about 12h+, maybe more, if underwater range = 285 at 6 kt. How it can be "fixed" without changing a hard code. We can increase the diesel power for faster recharging time, or we can reduce underwater range, or we can do this both things for best results. This last option is the best in my opinion. Why? Because like I said before, if the diesel engine in XXI is set up for very stronger power value than the electric engine, XXI becomes more easy to detect by enemy escorts especially with ASDIC, not only hydrophones! So ability for detect by the escorts with ASDIC depending on the XXI disel power, or electric engine power? No! Escorts ability for detect XXI depend in much degree on the difference between power of the diesel and electric engine. So 5250 disel power, and 5000 electric engine power is the best option. Someone can use 4000/3750, or less, but with negative acceleration of the Boat [from 0 - full] kt. Further. 5250/5000 engines power settings with vanila sh3 underwater range [285nm/6kt] gives still very long recharging time. If someone like this, shure why not. This thred is not an order to use my setting but is more helpfull thred in it's intention. However ability to recharge batteries from 10% - 100% of the power in 6 - max 8 hours is good option.
One night and again You can travel underwater 3x+ longer than on VIIC, for example at 4 kt 2 - 3,8 days, if underwater range is set up for 280Nm or 310 /4kt. At 6kt all day 14 -18h, and recharge at night. In the end of the war airplanes can be dangerous even at night.
I thinkered about it. But on the other hand is better to racharge batteries fast, than slow [12h+]. Because sometimes we have very short time to recharging batteries at the end of the war. In situation when You have 25% power in your batteries, and You desperate need more, what you can do, if you have wait for recharge to long? You can say "I always start recharging when batteries have 50% power. Sure. This is option. But recharge last 25% [from 75% - 100%] power takes most of all time. Sometimes 16 - 17kt speed is also needed. And remember. At 5250 diesel power with 5000 electric power engine XXI is still very more silent [XXI is harder to detect] than on 7000+/5000 D/E engine power for example [2500 power difference - Ping!!!]. This is also important. However if someone is not satisfied, can combine on his own way. I write this thred for help, not to force anybody to use my settings.

At 10 kt about 54 -60km, maybe more. It depands also on batteries energy. :ping:

EDIT: Also thanks for interesting post mickey177us:know:

more german data: Data reflects testing in the Baltic with a lesser degree of saline in the sea water boats are trimmed with more air than seawater as ballast.
Geschwindigkeit:
Aufgetaucht (surfaced)

Auf AK=15,37 kn (28,5 km/h) (Diesel)Auf AK=17,94 kn (33,2 km/h) (E-Motor) ( not possible in sh3 to run Electric motors while surfaced )Auf AK+1=18,08 kn (33,5 km/h) (E-Motor + Diesel)Getaucht (dive)

16,5 kn (30,6 km/h) (E-Motor)6,1 kn (11,3 km/h) (Schleichfahrt-E-Motor)10,42 kn (19,3 km/h) (bei Schnorchelfahrt) (cruise not charging battery) (max. erreichte Geschwindigkeiten auf U 3503, U 3506 bzw. U 3507)
Reichweite: (range)
Aufgetaucht (surface)

15.500 sm (28.700 km) bei 10 kn (19 km/h) nach Schleppversuchen errechnet, nach Messung auf U 3507: 14.100 sm bei 10 kn, 15.700 sm bei 9 kn.Getaucht(dive)

340 sm (630 km) bei 5 kn (9,3 km/h) bzw. 487 sm bei 3 kn mit Schleichmotoren. 120 sm bei 8 kn mit E-Maschinen.15.100 sm bei 10 kn bei Schnorchelfahrt.(cruise not charging)
The German Data is to me very important as it was the Boats they had during the war in which they went to See in. They had a Crucial Job inspite of Design Flaws (Removal of Maganese from the Hull Design because of Shortages which led to a flaw in the Weld Tempuratures which resulted in Welds Cracking ), Production Changes( MAN SuperChargers in,then out ), and Setbacks (MAN Factory Bombed Torpedo Shortage Due to Bombing of Storage Facility ) Etc. Wether or not they could have done this job is pure speculative.
In Theory the Type XXI in Conjunction with the Type XXIII were to prolong the War by Six Months. First the Type XXIII ( which I use with my own new skin, tweaks like no supercharger, reduced surface speed, rearranged compartments to reflect one diesel one electric motor one creep motor. fore and aft batteries in the fore room, two extra reserve torpedos ONLY for withdrawing and balancing the torpedos at 30m depth and simulating charging of the torpedo batteries not for carrying more torpedos, 27 second time to raise the air operated snorkel as per german data and many more realism tweaks but this boat is so unfinished compared to the other playable boats in the game ) sent to the Coastal Convoy Routes abandoned since 1940 and the withdrawal of the Type II boats. This is to draw Escorts from the West Coast of England and the North Atlantic opening a Hole for the Type XXIs to Enter and Attack Allied Shipping to choke the Supplies of the Proposed Invasion Front ( Plans made in the Summer of 1943 ).
By the time the first type XXI was Laid Down the Invasion had begun. This Months after the Withdrawal of the U-Boats From the Atlantic (at a Critical time) meant the Allies had by Winning the Battle of The Atlantic, Had Won the War.
The U-Boat Arm by May of 1945 was the Only Arm with its Orginization Still Intact. Even if 20 Type XXIs went on Patrol as early as January 1945 there could have been an increase in tonnage losses for the Allies but the War still could not have been delayed by six months the stated goal for the Electo-Boot Programme. The British and Americans would not have Sued for Peace and joined Germany to stop the advancing Soviets. This Scenario was to come to pass and Submariners Played their part again in a very Cold War.

evan82,make your fixed battery recharge in XXI ready to installation through JSGME! http://www.subsim.com/radioroom/imag...n_Confused.gif

I don't think he uses JSGME someone with his permission would need to do that. and if so please include his skin with water streams for an all-in-one evan81 type XXI.

I never used JSGME. Everything is in the first post. Besides, only description how to do it
can be useful especially when someone is not satisfied with my settings. Then can change them
by himself. The description in the first post is only a simple help how to do it, nothing more.
There is so many mods with so many other settings. So many conflicts are possible. That's why I always work directly on files, and I don't had CTD for a long time.

Right. But Skin for XXI with water streams and with 37mm AA guns [1 mod - all in one is ready, but not through JSGME]
Edit; I don't upload it yet. New streams are more fps friendly now.

evan, out of curiosity, have you ever considered modding the MK 303 guns for the Type XXI (even retaining the 20mm graphics if it is convenient)?