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*tester188

[1.77.2.105] Ki-27 Otsu has inaccurate layout fuel tank

1. The full name of the vehicle affected.

  • Ki-27 otsu


2. A detailed description of the issue you have or what you see as being erroneous regarding its representation in-game.

The fuel tank of Ki-27 Otsu is incorrect.

In historical facts, Ki-27 Otsu has a 50 L fuselage tank, 70 L wing tanks in front and back in both wings, and 133 L drop tank for long distance missions .

However, in the game, Ki-27 Otsu has a small fuselage tank that seems to be unlikely to have 50 L and wing tanks that are aligned on the left and right, and a drop tank that can not be dropped.


3. Unless the data is taken from an official Gaijin statement, please provide a documented test and provide the Client Log from that session.

In order to confirm this problem I observed the fuel tank layout with X-ray display and I checked the fuel loading weight with the test flight.

Spoiler

X-ray:

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rruKEDV.jpg

 

iAsZNAn.jpg

 

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oWYh8cU.jpg

 

Test flight:

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TjScUug.jpg

 

5713NQy.jpg

 

 

Client Log

2018_04_14_10_02_17__6108.clog


4. A detailed description of the fix you suggest. Provide sources including reference that underline your position.

I will suggest that you change the fuselage tank and wing tank to accurate one and remove the drop tank.

ZtYsWmh.jpg

(From source book.)

 

Sources

Historical documents:

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Quote

燃料
常時 約二八〇立 約二〇六瓩
満載 約三三〇立 約二四三瓩

 

Fuel

Normal: approximately 280 L / approximately 206 kg

Full load: approximately 330 L / approximately 243 kg

 

Deliberation in Army Munitions Council (陸軍軍需審議会に於いて審議の件), About Type 97 Fighter provisional official adoption (九七式戦闘機仮制式制定ノ件). by Army air headquarters (陸軍航空本部). December 1937.  Page 21, 41.

https://www.jacar.archives.go.jp/das/meta-en/C01004440800

https://www.jacar.archives.go.jp/aj/contents/pdf/C01/C01004440800.c0010200024.mitudai_065.0944_01.pdf

 

 

Books:

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Sample

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Japan Army Military Aircraft Collectiona (日本陸軍軍用機集). by Shigeru Nohara. June 1997. ISBN-13: 978-4766332094. Page 82, 85, 181.

 

 

User Manual:

Ki-79 is a variant with Ki-27 as a training plane, and the flight manual is almost common.

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胴体内燃料タンク: Fuel tank in fuselage

容量ハ五〇立: Capacity is 50 liters

 

a4wdUH2.jpg

(Ki-79 reduces the wing fuel tank compared with Ki-27 from 4 to 2.)

(How to handle type 2 two-seat fighter "Tei" (special equipment))*Type 2 Advanced Trainer Manual (二式高等練習機説明書). by army air headquarters (maybe). 1942. Page 44, 28, 93.

JACAR(Japan Center for Asian Historical Records)Ref.C13072067300, (National Institute for Defense Studies)

https://www.jacar.archives.go.jp/das/meta-en/A03032182000

https://www.digital.archives.go.jp/das/contents/pdf/S48B0500920000/0162.pdf

*This document has Manual of Type 2 Two-Seat Fighter Ki-45 in the first half, Manual of Type 2 Advanced Trainer Ki-79 in the second half. Please note that Type 2 Single-Seat Fighter Ki-44 codename "Tojo" has been incorrectly filled out.

 

 

A bug report already reported to developers that may be related to this problem.

 

Edited by *tester188
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Excellent work, as always! :good:  (and found old report too!)

 

@*tester188 Could you please search more about the "drop tank"?  I do not think it could be dropped in flight, but was easily removable on ground.

edit: ....well, looking at a diagram does look like it could be designed for inflight drop.

 

:salute:

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Filed.

Please answer above, will add.

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Ki-27 can suspend a drop tank (Japanese: 落下タンク Rakka-Tanku) on both wings.
I am convinced that it can be dropped during flight as it is a drop tank.
However, in the flight manual of Ki-79, which is a variant of Ki-27, the word "increased tank" (Japanese: 増加タンク Zouka-Tanku)  was used, so I could not find an explanation about the dropping equipment.
In my speculation, Ki-27 needed a drop tank because it was a fighter, but because the Ki-79 is a trainer, it did not need a drop tank.
 
Sources
Historical documents 1:
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CN4nJyu.jpg

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九七式戦闘機用落下タンク

Drop tank for Type 97 Fighter (Ki-27)

 

Transfer and Return of Drop Tanks for 97 Model Fighter Aircraft (97式戦闘機用落下タンク転還送に関する件). by Army Air Service Headquarters. August 1940. Page 1.

JACAR(Japan Center for Asian Historical Records)Ref.C04122174800, 1940 Rikushi Mitsu dai nikki 28th -- No. 2/3(National Institute for Defense Studies)

C04122174800.c0311002067.shimitu_131.0874_01.pdf

https://www.jacar.archives.go.jp/das/meta-en/C04122174800

 

 

Historical documents 2:

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Supplements Nos. 1, 2, 3, 4, and 5 to manual on Japanese aircraft, TAIC No. 1, 19 March to 7 August 1945. Report No. 9-a(46), USSBS Index Section 6. Frame Number 220, 221.

http://dl.ndl.go.jp/info:ndljp/pid/4009758/221?itemId=info%3Andljp%2Fpid%2F4009758&contentNo=221&__lang=en

 

Supplements Nos. 1, 2, 3, 4, and 5 to manual on Japanese aircraft, TAIC No. 1, 19 March to 7 August 1945. Report No. 9-a(46), USSBS Index Section 6.pdf

https://drive.google.com/file/d/1kC7nAsg827X4QeULghGtOLrzMlyX3Cdx/view?usp=sharing

(PDF: 87 MB)

Edited by *tester188
About Ki-79
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:good:

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