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Author Topic: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)  (Read 25653 times)

Offline sagallacci

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #15 on: January 02, 2010, 09:08:06 pm »
Regarding the jet version of the R2Y1, I recall that years ago I saw, in a Japanese publication, a photo and very small/limited detail illustration that proported to be a machine actually built. The photo was of a wreaked fuselage center section with wing root ducts and the illustration was of the engine installation. Of particular note was that the engines were staggered in the fuselage. I'll try to find the material, though I have not seen anything related to that anywhere else.

Offline borovik

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #16 on: January 03, 2010, 02:36:59 pm »
Regarding the jet version of the R2Y1...
sorry, source unknown.
Also on page 3 (Reply # 40), that the same threads have a wonderful color projection P.Allen aka Flitzer.
http://www.secretprojects.co.uk/forum/index.php/topic,661.30.html
Quote
Re: Japanese stuff
Reply #91 on: August 27, 2008, 12:37:18 am
Could anybody help me identify these projects?
http://www.secretprojects.co.uk/forum/index.php/topic,661.90.html
Better late than never
Number 4 [Escanear0004.jpg] is the  Kawanishi H11K.  (swallow right)
from: "The XPlanes Of Imperial Japanese Army & Navy 1924-45"
« Last Edit: January 03, 2010, 02:50:44 pm by borovik »

Offline elmayerle

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #17 on: January 14, 2010, 01:21:02 pm »
Regarding the jet version of the R2Y1...
sorry, source unknown.
Also on page 3 (Reply # 40), that the same threads have a wonderful color projection P.Allen aka Flitzer.
http://www.secretprojects.co.uk/forum/index.php/topic,661.30.html
Quote
Re: Japanese stuff
Reply #91 on: August 27, 2008, 12:37:18 am
Could anybody help me identify these projects?
http://www.secretprojects.co.uk/forum/index.php/topic,661.90.html
Better late than never
Number 4 [Escanear0004.jpg] is the  Kawanishi H11K.  (swallow right)
from: "The XPlanes Of Imperial Japanese Army & Navy 1924-45"


The R2Y2 with underwing engines or with wing-root intakes are designs that make sense.  The version with a nose intake just doesn't make sense from the duct loses you'd get with the long duct as well as the valuable fuselage "real estate" such a duct takes up.  To my way of thinking, the underwing version would be the easiest and done first, followed by the one with wing-root engines inside the fuselage(note, this also allows you to sweep the wing for a higher-speed version).

Offline Hikoki1946

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #18 on: January 30, 2010, 07:52:20 am »
This is my take as well. Mounting the engines on the wings was simply the most expedient way to equip the R2Y1 with jets. Did the Japanese consider the nose intake idea? I don't doubt they did, especially if one considers the Army design for a single seat jet as put forward by Captain Hayashi which had the engine mounted in the tail with a nose intake, similar to the F-84. But the main issue was the Japanese had no time to fully investigate the effects of long intakes and the Germans likely did not share what research they had on the topic with the Japanese. And even the Germans didn't get the P.1101 off the ground to even validate their research, let alone the Ta 183 making it. If you look at all of the high performance jet aircraft the Germans fielded or flew, all used nacelle mounted engines (Me 262, Ar 234, Ju 287, He 162, He 280). I don't include the He 178 as this was only a technology demonstrator, not a combat aircraft. And if you look at the Japanese jet designs, again, just about all of them used external engines (Tenga, K-200, Kitsuka, R2Y2, the turbojet Gekko project, and the competing Army design for a single jet fighter by Captain Yasuda) with the exceptions of Hayashi's design and the R2Y2 variants and, I imagine, you could lump in the turbojet Oka models.

As for a picture that alludes to showing the jet version of the R2Y1, I'd have to view it with skepticism. I've sometimes seen the photo of the second, incomplete R2Y1 described as having been modified to mount jets but that simply wasn't the case. Even the completed R2Y1 had wing intakes and as the design had rather severe cooling problems, if the second fuselage did have altered wing intakes, it was to cool the Aichi engine, not for jets (not near by library to check!).

Cheers,

Ed



The R2Y2 with underwing engines or with wing-root intakes are designs that make sense.  The version with a nose intake just doesn't make sense from the duct loses you'd get with the long duct as well as the valuable fuselage "real estate" such a duct takes up.  To my way of thinking, the underwing version would be the easiest and done first, followed by the one with wing-root engines inside the fuselage(note, this also allows you to sweep the wing for a higher-speed version).

Offline blackkite

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #19 on: February 02, 2012, 04:47:29 am »
Thanks T-50 san!
Kugisho(空技廠) Keiun(景雲) pictures. Enjoy.


« Last Edit: February 02, 2012, 04:54:33 am by blackkite »

Offline blackkite

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #20 on: February 02, 2012, 04:52:44 am »
Next pictures.
Kugisho engineers called her Okeichan(お景ちゃん).

Offline Skyblazer

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #21 on: February 02, 2012, 07:23:17 am »
Kugisho engineers called her Okeichan(お景ちゃん).

Which means... ?

Offline T-50

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #22 on: February 02, 2012, 03:06:14 pm »
Hi blackkite san you did it again! I didnt know there were more pics about the beatiful cloud!I thought the war has destroyed most of the pics.
Im glad there are more surviving pics of this again very extraordinaire plane,I know there were plans to reequip this plane with jet engines
thanks again to share this rare photo material with us!
cheers
T-50

Offline blackkite

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #23 on: February 02, 2012, 03:29:02 pm »
Kugisho engineers called her Okeichan(お景ちゃん).

Which means... ?

Keiun is 景雲.
景 means scenery. 雲 is cloud.
In Japan, we use letter 景 for woman's name. For example 景子(keiko).
子 means child. Many Japanese women have this letter 子 for her name. For example 雅子(Masako, the name of Japanese princess name as you know).
Okeichan is Keiko's pet name. Generally 景子 are very beautiful girls. ;D For example Keiko Takeshita.

http://talent.yahoo.co.jp/pf/detail/pp2714

http://search.babylon.com/?s=img&babsrc=HP_ss&q=%E9%9B%85%E5%AD%90%E5%A6%83
« Last Edit: February 02, 2012, 05:14:36 pm by blackkite »

Offline Skyblazer

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #24 on: February 02, 2012, 03:48:09 pm »
Thanks for the explanations! So what is the word "onna", then? I thought that was the word for woman...

Offline blackkite

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #25 on: February 02, 2012, 03:51:58 pm »
Onna(woman) is 女. Man is otoko(男).

Offline Justo Miranda

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #26 on: February 03, 2012, 06:52:54 am »
Keiun additional info

Offline hesham

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #27 on: February 03, 2012, 01:43:08 pm »
 Excellent my dear Justo.

Offline blackkite

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #28 on: February 03, 2012, 03:15:17 pm »
Wow beautiful Okeichan !! ;)
« Last Edit: February 03, 2012, 05:09:36 pm by blackkite »

Offline windswords

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Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #29 on: February 03, 2012, 05:29:29 pm »
Why in the jet proposal (R2Y2) are the Keiun's engines offset? Wouldn't that create a weight imbalance as well as a thrust imbalance?  ???
Frank