I-41

Info

伊41 (い41)		I-41
572
Junsen Type B Kai Ichi Aircraft Carrying Submarine

HP	14→18	FP	2→8
ARM	4→20	TORP	36→73
EVA	12→37	AA	0
PLA	2	ASW	0
SPD	Slow	LOS	10→30
RGE	Short	LUK	18→71

Aircraft	Equipment
1	-Unequipped-
1	-Unequipped-
	-Locked-
	-Locked-

Modernization	0 2 1 0
Build Time	0:22 (Unbuildable)	Remodel Req
Consumption	10 20	Dismantle	1 3 2 0
Illustrator	Shibafu	Seiyuu	Moriyama Yurika

伊41改 (い41かい)		I-41 Kai
577
Junsen Type B Kai Ichi Aircraft Carrying Submarine

HP	18→22	FP	3→14
ARM	4→21	TORP	38→89
EVA	14→46	AA	0
PLA	3	ASW	0
SPD	Slow	LOS	11→33
RGE	Short	LUK	22→81

Aircraft	Equipment
1	-Unequipped-
2	-Unequipped-
	-Locked-
	-Locked-

Modernization	0 3 1 0
Remodel Level	50	Remodel Req	290 170
Consumption	10 25	Dismantle	1 2 2 2
Illustrator	Shibafu	Seiyuu	Moriyama Yurika

Gameplay Notes

Submarines (SS) have high torpedo stats, and are limited to the Opening Torpedo Salvo, the Closing Torpedo Salvo, and Night Battle. They:

Are only vulnerable to ASW only.
Utilize Sub Submarine Torpedoes and Submarine Equipment.
Can inately trigger Opening Torpedo Salvos after reaching level 10.
Have access to special Night Cut-Ins.

Submarine Aircraft Carriers (SSV), are SS that can equip Recon/Bomber/ seaplanes.

Special Mechanics

None

Equipability Exceptions

SSV	Default equipment compatibility
	✔️ Can Equip	❌ Cannot Equip
	Recon Bomber	Sp
	Sub Minisub Small	Sp Sp_Sec Large Small Large Sp
		Medium Large Large
	RE:
	Notes: = ; = ; = ; = ; =Recon ; =Bomber ; Small= ; Medium= ; Sec= ; =

I-41 Equipability Exceptions
	I-41/Kai
Expansion Slot Exceptions	Can Equip:
Ship Exceptions	-

Fit Bonuses

[edit]I-41 Equipment Bonuses
Equipment	Extra Requirement							Note
Special Type 4 Amphibious Tank OR Special Type 4 Amphibious Tank Kai	(★0)	+1	+2				-1
	(★1-2)	+1	+3				-1
	(★3-5)	+1	+3			+1	-1
	(★6-9)	+1	+3			+2	-1
	(★MAX)	+1	+4			+2	-1
	(1st equipped)	+2	+1			+2		One-time
Ship-Type Bonuses
Type 0 Small Reconnaissance Seaplane OR Type 0 Small Reconnaissance Seaplane (Skilled)	(★0)		+1		+3	+1	+5
	(★1)		+2		+3	+1	+5
	(★2)		+2		+3	+2	+5
	(★3-4)		+2		+3	+2	+6
	(★5-7)		+2		+4	+2	+6
	(★8-9)		+2		+4	+3	+6
	(★MAX)		+2		+4	+3	+7
Type 0 Small Reconnaissance Seaplane (Skilled)			+2		+1	+1	+1	+2
Type D Kouhyouteki Kai (Kouryuu Kai)		-1					-7
Late Model 53cm Bow Torpedo Mount (8 tubes)	(1st equipped) (★8-9)		+1					One-time
Late Model 53cm Bow Torpedo Mount (8 tubes)	(1st equipped) (★MAX)		+1			+1		One-time
Kyoufuu Kai 2	(★3-4)	+1
	(★5-6)	+1		+1
	(★7-9)	+1		+1			+1
	(★MAX)	+1		+1		+1	+1
Special Type 4 Amphibious Tank Kai	(★0-1)	+1	+1			+1
	(★2-3)	+2	+1			+1
	(★4-7)	+2	+2			+1
	(★8-MAX)	+3	+2			+1
Late Model Submarine Radar & Passive Radiolocator	+ Late Model Bow Torpedo Mount (6 tubes) OR Skilled Sonar Personnel + Late Model Bow Torpedo Mount (6 tubes) OR Late Model 53cm Bow Torpedo Mount (8 tubes)		+3				+2	One-time
Late Model Radar & Passive Radiolocator + Snorkel Equipment	(★3-4)						+1
	(★5-9)		+1				+1
	(★MAX)		+1			+1	+1
	(★2-MAX) + ★4+ Skilled Sonar Personnel + Late Model Bow Torpedo Mount (4 tubes)		+7			+5		One-time

Important Information

Helper for the following equipment:
- Improvement: Type 0 Small Reconnaissance Seaplane (Skilled)
- Improvement & upgrade: Type 0 Small Reconnaissance Seaplane

Drop Locations

Ship	Rarity	Type	No.	World 1						World 2					World 3					World 7					World 4					World 5					World 6					Remarks
Ship	Rarity	Type	No.	1	2	3	4	5	6	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	1	2	3	4	5	Remarks
I-41	Very Rare	SSV	572																																					Unbuildable

Voice Lines

Quotes

Event	Japanese/English
Introduction Play	I-class submarine, Junsen Type B Kai Ichi, I-41! Pleased ta meetcha! You're the Admiral then? Wonder if you're cooler than that captain^[1]? Well then, show me how ya lead!
Introduction Play	伊号潜水艦、巡潜乙型改一、その二番艦、伊41、見参！あんたが提督って訳かい？あの艦長とどっちがすげーかな？ま、見せておくれよ、その采配ってのを！
Introduction Play	I-class submarine, Junsen Type B Kai Ichi, I-41! Pleased ta meetcha! I'll keep a lid on the drinking today... well, try my best. Remember, surfaced by day, submerged by night!^[2]
Introduction Play	伊号潜水艦、巡潜乙型改一、その二番艦、伊41、見参！今日もお酒は程々にする努力をしつつ、まあ、頑張るぜ。昼は水上、夜は潜航、そこんとこよろしく!
Library Play	I am I-41, an I-class submarine, the second of a remodeled class of the mainstay Junsen Type Bs. Under the command of famed captain Itakura, I crossed many dangerous obstacles to accomplish my missions. We made supply runs in very dangerous waters in order to rescue his superior to whom he was very close.^[3] Don't forget... any of us.
Library Play	伊号潜水艦、主力の巡潜乙型の改良型、その二番艦伊41だ。名艦長の板倉艦長の指揮で、結構危ない橋を何度も渡って任務を成功させてきたんだ。艦長と縁の深い昔の上官を助けるために既に危険海域だったブインの補給にも向かったよ。みんなの事……忘れるなよ。
Secretary 1 Play	Eh? You're picking me? Guess I'm the only one cut out for this.
Secretary 1 Play	え?この私をご指名?しょうがねえなあ。
Secretary 1 Play	Eh? You're picking me again? Guess I'm the only one cut out for this!
Secretary 1 Play	え?またこのあたしをご指名?じゃあしょうがねえな！
Secretary 2 Play	How to handle an encounter with enemy planes? You just do that thing, you know, get on the bridge and wave your cap at them. That'll do... I think?^[4]
Secretary 2 Play	敵機に遭遇した時かい？そいつはあれだ、艦橋に出て全力で帽子を振るってのもありだ。…ありか？
Secretary 2 Play	How to handle an encounter with enemy planes? You just do that thing, you know, get on the bridge and wave your cap at them. That'll do... I think. N-Not like I survived with that though!
Secretary 2 Play	敵機に遭遇した時かい?そいつはあれだ、帽子を振ってってのもありだ。うーん、ありか。あ、あたしがこれで凌いだわけじゃないよ。
Secretary 3 Play	What, what?? I've got it right here, no need to grope around like that. Look, see, the whiskey I've been saving! Got it as payback for an old favor I did. I haven't forgotten, ya know? When you're indebted to someone, you come running when you're needed.
Secretary 3 Play	なんだなんだ～？そんなに弄らなくても、ちゃーんとあるぜ。ほら、取って置きのウィスキー！昔世話になった礼だよ。忘れちゃぁ、いないぜ？もしもの時は駆けつける、それが恩義ってやつだ。
Idle Play	Ahhh, Kaga-san? She was a beast of a ship. But there were good people on board. Oh, you heard that? Just the ramblings of one of my fairies. Keep it on the down low. Alright, have a shot of whiskey! Cheers!
Idle Play	ああ、加賀さんか。加賀さんもやっべぇ艦だったな。でもさ、本当はいい人なんだ。あ、これ?これは私の妖精さんの独り言。内緒ね。さ、ウイスキーで乾杯!しよう!
Secretary Married Play	I told ya ta stop being so gloomy. What's the value of a letter or two of apologies? If the time comes, I'll come running. Absolutely. Take it easy.
Secretary Married Play	そんなしけたツラすんなって。始末書の一枚や二枚がなんだ?いざって時は、私が駆けつけてやる。絶対だ。安心しな。
Wedding Play	What, what is it, Admiral? With me? You want to be with me? I'll need drinking money, kay? I might get up ta all sorts of trouble, ya know? I might have a biiiit of a drinking habit, ya know? ... so you're okay with all that. Oh. Well, then, what can I say? Let's do it!
Wedding Play	なんだなんだ、提督。私と何?一緒になろうっての?酒代かかるぜ?結構むちゃくちゃやるかもだぜ?酒癖ちょっとだけあれかもだぜ?え、いいんだ。そっか。じゃあ、じゃあ、仕方ねーな!やるか!
Looking At Scores Play	Ugh, I'm no good at managing all these annoying lil documents. Aight, here ya go.
Looking At Scores Play	ああ、面倒な書類は苦手だな。あいよ、見といて。
Joining A Fleet Play	Sub I-41, departin'! I'm tellin' ya, I'll be back! Let's go!
Joining A Fleet Play	伊41潜、出るぜ!必ずけえってくるって!行くぞ!
Equipment 1 Play	Thanks.
Equipment 1 Play	あんがとよ。
Equipment 1 Play	Yeah, thanks.
Equipment 1 Play	ん、あんがたよ。
Equipment 2 Play	Will this work?
Equipment 2 Play	これ大丈夫かね?
Equipment 2 Play	I'll make it work!
Equipment 2 Play	これならなんとかなるか!
Equipment 3^[5] Play	Yeah, this'll do.
Equipment 3^[5] Play	ああ、いけるぜ。
Supply Play	Thaaaanks!
Supply Play	ありがてー
Docking Minor Play	Just a scratch. All it needs is a lick.
Docking Minor Play	かすり傷さ、なめとけ治る。
Docking Major Play	Well, it's not a fatal wound, but... ow-ow-ow, ooph...
Docking Major Play	まあ致命傷じゃねえけどさ、痛ってて、うっつー
Construction Play	Hmm? New girl's here.
Construction Play	はあ、新しい奴が来たね。
Returning From Sortie Play	Aaaaand, we're all safely back in port. Don't assign me another apology letter, kay?
Returning From Sortie Play	よーし、全艦無事に港に戻ったぜ。始末書は勘弁な？
Starting A Sortie Play	Sixth Fleet, First Submarine Squadron, I-41, sortieing! I'll get it done, just you watch!
Starting A Sortie Play	第6艦隊、第1潜水戦隊、伊41、出撃する！やってやんぜー、見てな！
Battle Start Play	Enemy spotted! Let's bring it to them! Prep the torpedoes! All hands, battle stations!
Battle Start Play	敵さん発見だ!仕掛けるぞ!魚雷戦用意!各自持ち場につけ!
Attack Play	Numbers 1 through 4, go! Fire!
Attack Play	1番から4番!いくぞー! てー!
Secondary Attack Play	This is how a turtle fights!^[6]
Secondary Attack Play	どん亀の戦いってのはこうするのよ！
Night Battle Play	Keep up the chase! Don't lose this chance!
Night Battle Play	追撃する!この機を逃すな!
MVP Play	Oh, a citation, huh? Nice. Would be better if you threw in a good bottle of sake with it!
MVP Play	おっと、感状ってやつか。いいね。ついでにうまい酒の一本もつけてくれたっていいぜ？
Minor Damage 1 Play	Tch! I can still do it!
Minor Damage 1 Play	くっ、まだいける!
Minor Damage 2 Play	Ugh! That was close, real close...
Minor Damage 2 Play	あっ! あぶねーあぶねー
Major Damage Play	I got hit...? Damn it! I'm not done yet!
Major Damage Play	食らったか、クソが! まだ沈むかい!
Sunk Play	Seriously... is this it? I-I think I... caused as much trouble as I could...
Sunk Play	マジか…ここまでか…あぁ、暴れるだけ、暴れた…かな…

↑ Lt Cdr Itakura Mitsuma
↑ Itakura and I-41's survival late in the war was allegedly based on this strategy, which was the opposite of standard procedure. While this counterintuitively leaves the submarine visible in broad daylight, his targets may have become complacent with superior radars and not expected submerged submarines at night.
↑ This was Vice Admiral Samejima Tomoshige, who had established his Eighth Fleet headquarters in Buin, Bougainville in New Guinea. Back in 1935, Itakura had gotten upset over the behavior of a superior and punched Samejima, the captain of their ship Mogami, while drunk. Samejima showed leniency, and Itakura repaid him years later in 1944 with three dangerous runs to Buin. On one of these trips he brought a bottle of whiskey, which Samejima kept to his dying day.
↑ Another of Itakura's feats was supposedly warding off a B-24 attack on his submarine by waving his cap, pretending to be a US sub.
↑ This line is shared with expedition selection, resource collection, instant repair and development.
↑ (Soft-shelled) turtle was a derisive nickname for Japanese submarines, similar to the general English idiom of "sitting duck". Itakura's 1995 autobiography is also titled something along the lines of Diary of a Turtle Captain's Youth.

Hourlies (Kai)

Time	Japanese/English
00:00 Play	Huh, I'm on duty? Well that sucks. Whatever. The time? Uhh, it's just past midnight.
00:00 Play	ん?あたしが当番か、めんどくせえ。ん、まいっか。時間? あー、ちょうどてっぺん回ったとこさ。
01:00 Play	0100. Alright, work's done!
01:00 Play	マルヒトマルマル。よし、作業完了!
02:00 Play	0200. Everything's in order! Hm? Admiral, those documents...
02:00 Play	マルフタマルマル。異常なーし! ん?提督、その書類って…
03:00 Play	0300- wha, no way, these are all apology letters? Again? Fine, I just have to fill them out, right?
03:00 Play	マルサンマルマ、って、うわ、なにこれ。えー、始末書?また?書きゃいいんでしょう、書きゃ。
04:00 Play	0400. Didn't finish writing these letters until morning. Well, I'm used to it. Sheesh, just a little sleep would be nice.
04:00 Play	マルヨンマルマル。始末書書いてたらもう朝だよ。まっ、いいか。慣れてるし。はぁ、少しだけ寝るかいな。
05:00 Play	W-what... I'm sleepy... huh, time... 0500... morning...
05:00 Play	んー、なんだよ、まだ眠いにゃ…んー、時間、マルゴーマルマル、朝だにゃ…
06:00 Play	0600. Morning! Up and at 'em! Fleet, all hands, attention, it's morning! Good morning, Admiral! Morning time!
06:00 Play	マルロクマルマル。朝だ!しゃっきり起きよう!艦隊総員起こし!朝だぜ!提督、おはよう!朝だぜ!
07:00 Play	0700. Mealtime. Hup. Your breakfast, admiral. Simple but important. Eat up, eat!
07:00 Play	マルナナマルマル。飯だ。ほい、提督、朝飯だ。簡単だけど大事だぜ。さっ、食え食え。
08:00 Play	0800. With the meal done, it's time to set sail! Where to? Buin? Rabaul? Huhh, Operation Tatsumaki?
08:00 Play	マルハチマルマル。さあ、飯を食ったら出航だ!どこだ?ブイン?ラバール?はぁ?竜巻作戦だ?
09:00 Play	0900. The secret weapon, the Special Type 4 Amphibious Tank? No no, not with that roaring toad^[1]! Not happening! Huh? They've given it a complete overhaul? Hmm, really?
09:00 Play	マルキューマルマル。秘密兵器、特四式内火艇だ?ダメダメ、あんな爆音ヒキガエル。論外!え?抜本的に改良した？んー、本当か?
10:00 Play	1000. What types of shipgirl did I write on the application form? Well that's obvious. One: submarine. Two: submarine. Three: submarine!
10:00 Play	ヒトマルマルマル。艦娘志望なんて書いたかって? 決まってる。一、潜水艦。二、潜水艦。三、潜水艦！
11:00 Play	1100. Now, it's about time for lunch. Hey Admiral, how about some shots of whiskey with lunch? Yeah, maybe taking it too far...
11:00 Play	ヒトヒトマルマル。さっ、そろそろ昼飯だな。提督、昼飯と一緒にウイスキーで一杯やるかい? あぁ、昼はさすがにあれが…
12:00 Play	1200. Time to eat! Rice balls and pickled radish aight? Ah, no alcohol. None, of course, of course!
12:00 Play	ヒトフタマルマル。さっ、飯だ。握り飯とたくあんでいいだろ? あ、酒はなし。なしで、もちろんさ。
13:00 Play	1300. Oh man, I ate so much! Alright, more hard work this afternoon. That's right - surfaced by day, submerged by night. That's my secret!
13:00 Play	ヒトサンマルマル。はぁ、食った食った！さぁ、午後も頑張っていこう。そう、昼は水上、夜は潜航、これだ!
14:00 Play	140- wait, that's... I-36! Ah, doing good, huh? Where you headed? Huh, the old base? Don't! Huh, you'll make it work? No, not like that you won't! No, no, don't! Stop!
14:00 Play	ヒトヨンマ…ん、あれは…伊36潜!あ、元気にやってんな。お前どこ行くんだ？ああ、旧基地だ？行かねぇよ！え？勝つしゃ？ねぇよ、あのまんまじゃ、マジでないない、ねぇから！
15:00 Play	1500- is that heavy cruiser Mogami I see before me? It's a pleasure to see you again, Mogami! Yes! Oh, this is that bottle of whiskey? I... thank you very much! No, it was my pleasure!
15:00 Play	ヒトゴーマルマ…前方より重巡最上!最上さん、ご無沙汰しています!はい!え、あのウイスキーの瓶を?それは…ありがとうございます!いえ、こちらこそ!
16:00 Play	1600. What's up with the whiskey bottle? Oh, don't worry about it. I know, how about some shots tonight? Come on, alright?
16:00 Play	ヒトロクマルマル。ウイスキーの瓶がどうしたって? まあ、いいじゃないか。そうだ、今夜はウイスキーで一杯やろう。付き合いよ。なっ?
17:00 Play	1700. Look, Admiral, the sunset is so beautiful. I'm tearing up. Damn... what? Don't give me that look. Hmph.
17:00 Play	ヒトナナマルマル。提督、見ろよ。夕焼けが綺麗だぜ。泣けてくるな。ちくしょう。なんだよ、見んなよ。ん。
18:00 Play	1800. Time for dinner! The meal? Leave it ta me! I got delivery from Sixth Fleet First Squadron's Heian Maru. Her food's amazing!
18:00 Play	ヒトハチマルマル。さっ、夕飯の時間だ!夕飯? 任しとけ。第六艦隊、第一戦隊配属の平安丸にちょいとデリバリー頼んどいた。やつの飯はうまいぜ。
19:00 Play	Ohhhh man this looks good! Classic Heian Maru stuff! Right, it's 1900... perfect timing! Don't be afraid to dig in, Admiral!
19:00 Play	ほおう、うまそう!さすが平安丸だ!うん、ヒトキューマルマルか…時間通り！さっ、提督も遠慮せず食えよ！
20:00 Play	2000. Huh? You're still out, Heian Maru? Huh? What happened off Kiska? T-That was an exercise, I'm telling you, just simulating a man overboard. And that wasn't me in the first place... w-what!?^[2]
20:00 Play	フタマルマルマル。あれ?平安丸まだいたの?はっ?キスカの海で? あ、ありゃ訓練だよ訓練、溺者救助訓練。そもそもあたしじゃないし…な、なに!?
21:00 Play	2100. Whew, Heian Maru finally went home... w-what, Admiral? That was, uh... something came up, so the alcohol, you know, had to get rid of it all and did...n't think up anything, haha?
21:00 Play	フタヒトマルマル。やれやれ、平安丸、やっと帰ったか…ん、なんだよ、提督？あれは、その…いや、事情があって、お酒はね、減らそうとは思って…んまぁ、ないかも?
22:00 Play	2200. Here's yours, Admiral. Watered yours down if that's okay. Cheers! Glug, glug... haaaah, so good. Got me tearing up. Yeah.
22:00 Play	フタフタヒトマル。さっ、提督の。水割りでいいかい?乾杯だ。ん、ん、はぁ、うまい。泣けるほど、うまい。あっ。
23:00 Play	2300. Midnight, huh. It's important to stay surfaced by day and submerged by night, even if that completely goes against doctrine. The enemy's got amazing radar, you see. So their guard's down at night, meaning you can sneak up behind them and blast away. It's important to think with your own head and not blindly follow doctrine.
23:00 Play	フタサンマルマル。深夜だな。セオリーの真逆だが、大事なのは昼は水上、夜は潜航だ。敵は優秀な電探があるんだ。夜のんびりしたら、後ろからバッサリだ。セオリー通りじゃなく、自分の頭で考える。それが大事。

↑ Itakura derided the "king of toads" for its extremely noisy engines
↑ See Heian Maru's account.

CG

Regular
Base Base Damaged Kai Kai Damaged

Seasonal
Saury 2024 Saury 2024 Damaged

Trivia

Her abyssal form is assumed to be the Abyssal I-go Water Princess.

General Information

Unlike other submarines, she does not call herself by some nickname. Some potential nicknames are:
- "Shi Chan" ("Ms 4", しーちゃん), used by I-36,
- "Yoichi" (余市), an alternative reading of "41", not really used.
She was launched on the 10th of November 1942.
She sunk on the 18th of November 1944.

Update History

She was added on the 3rd of March 2024 as Early Spring 2024 Event E4 reward.

Misc

She talks a lot about her captain, LCDR Itakura Mitsumi, who had an infamous alcohol-related incident as recounted by Heian Maru.

The details
When Itakura was in command of I-2, after some water damage to the sub, he and some of the crew decided to get rid of all of the liquor onboard by drinking it. Those who could not drink were asked to keep watch and prevent anyone from getting onto the deck for safety. Itakura decided to come up to check for himself and then fell into the freezing water while attempting to urinate. Nearly dying, he was successfully resuscitated. When the crew of Heian Maru noticed the commotion and signaled to check (イカニサレシヤ), Itakura replied: "We’re just conducting some water rescue training. Exercise completed and situation normal." While Itakura was ashamed by the ordeal, some of his subordinates and higher-ups who found out were impressed and nicknamed him “immortal” (不死身).