IJN cruisers availability

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mescal
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IJN cruisers availability

Post by mescal » 05 Jan 2009 10:40

After having done the same study for the Kriegsmarine, US Navy and Royal Nay,
I went on with the analysis of the availability of the cruisers of the Imperial Japanese Navy.

Below is the first part (the Heavy cruisers, from Furutaka to Tone classes).

the color code :
green : available
red : sunk
orange : combat damage
yellow : noncombat damage
purple : repair/refit/... = unavailable
light blue : training
brown : withdrawn from active service
grey : building

I also put some tags to give a rough indication of the location of the ships :
CP : Central Pacific
SP : South Pacific (including ships based at Truk)
NP : North Pacific
EI : East Indies (Indonesia - Singapore - malaya)
VN : Viet Nam (based at Cam Ranh)
HK : Hong Kong
HW : Home Waters (from Formosa to Honshu, not Hokkaido (=north Pacific))
PI : Philippines
IO : Indian Ocean
IJN_cruiser_avail11.jpg
IJN_cruiser_avail12.jpg
Any feedback is apppreciated.
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Olivier

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LWD
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Re: IJN cruisers availability

Post by LWD » 05 Jan 2009 14:31

Interesting. Makes Dec of 43 look like a really bad month as far as cruiser availability. I don't think I'd have noticed that wihout these charts.

Thanks again.

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Takao
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Re: IJN cruisers availability

Post by Takao » 05 Jan 2009 15:07

Well, technically November 1943, was the bad month. That was when planes from the Saratoga & Princeton struck Rabaul and damaged 6 heavy cruisers, 2 light cruisers, and 3 destroyers.

Link here: http://www.combinedfleet.com/btl_rab.htm

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mescal
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Re: IJN cruisers availability

Post by mescal » 05 Jan 2009 18:17

The damage suffered in Rabaul was compounded by the slight damage suffered by Myoko & Haguro at Empress Augusta Bay, and by the fact that all these damages came at a time when 2 heavy cruisers (Tone & Nachi) were under refit.


Here is the second part, dealing with the light cruisers.
(The color and tag codes remain the same)
IJN_cruiser_avail21.jpg
IJN_cruiser_avail22.jpg
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Olivier

Brady
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Re: IJN cruisers availability

Post by Brady » 05 Jan 2009 22:40

Very cool, I love the charts.

Eugen Pinak
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Re: IJN cruisers availability

Post by Eugen Pinak » 06 Jan 2009 12:24

Great job! Thank you very much, Mescal.

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LWD
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Re: IJN cruisers availability

Post by LWD » 07 Jan 2009 11:55

Takao wrote:Well, technically November 1943, was the bad month. That was when planes from the Saratoga & Princeton struck Rabaul and damaged 6 heavy cruisers, 2 light cruisers, and 3 destroyers....
But the charts show a bunch of cruisers going into the docks for service in Dec. Not just battle damaged ones.

cstunts
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Re: IJN cruisers availability

Post by cstunts » 07 Jan 2009 22:05

Hello,

CHIKUMA was in dockyard for repairs mid-May 1942 after having been struck by 3 dummy torpedoes during large scale maneuevers before the Midway operation. If you want to add a little slice of color... :wink:

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mescal
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Re: IJN cruisers availability

Post by mescal » 08 Jan 2009 10:39

Hello,
CHIKUMA was in dockyard for repairs mid-May 1942
As I understood it, she was in yard for just a few weeks, and since my basic time-unit is the month, I generally did not mention the unavailability that lasted 2 weeks or less.
I acknowledge that it may be a problem, because in the IJN case, there are a lot of short-term repairs.
The problem is also compounded by the fact that the ships required a significant time to travel to the yard (for example from Rabaul to Sasebo).


Anyway, here is a chart showing the number of available cruisers :
IJN_charts_nb.jpg

And here is the cruiser available by tonnage :
IJN_charts_tons.jpg
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Olivier

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LWD
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Re: IJN cruisers availability

Post by LWD » 08 Jan 2009 14:27

Interesting Dec seams to be a low point in most years. I wonder if that was due to weather or funding cycle or ....?

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mescal
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Re: IJN cruisers availability

Post by mescal » 08 Jan 2009 23:11

I also wondered at first glance, but I do not think the season has much to do.
The only case where I'm pretty sure weather had an impact is the Dec43 refit of Nachi, which was stationed in the Kurile area just before.
Almost all other ships were located in tropical or equatorial areas. (but I do not know the seasonality of the typhoons in those areas).

Moreover, lots of battles occured in the fall : Guadalcanal in 42; Rabaul & Empress Augusta in 43; Leyte in 44.
These explain most of the negative variations in Nov/dec each year.
Olivier

maxs75
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Re: IJN cruisers availability

Post by maxs75 » 24 Feb 2009 11:41

Thanks for the charts.
I did not realize till now that for the most part of 1944 the Navy had more Heavy than light cruisers.
Max

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Sewer King
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Re: IJN cruisers availability

Post by Sewer King » 25 Feb 2009 04:36

very good graphic work. Does this particular kind of bar chart have a name? It is like that of a production schedule -- except that it is in reverse, with ships being destroyed rather than built.

As grim as it sounds, reading this chart is seeing the flatlining of the Imperial cruiser fleet.

It would seem too large to draw up a similar chart for the destroyers, with 64 of them lost by mid-war.

-- Alan

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mescal
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Re: IJN cruisers availability

Post by mescal » 25 Feb 2009 16:31

I began a similar work for DDs but I temporarily stopped working on it because it took me too much time.
However, I still hope to be able to finish it. Data are indeed available quite easily (mainly on combinedfleet.com).

I currently have a list of 165 destroyers, 129 of them being confirmed war losses.
For all the losses, I have the date, the cause of the loss and the geographic area.

Actually, I think that I will first post the charts for the BBs. They are currently almost ready for all the 3 main navies of WW2 - I just have some verification work left.
Olivier

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