Register here

Author Topic: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)  (Read 26219 times)

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« on: November 01, 2006, 05:11:53 pm »
Is the Yokosuka Tenga any relation to the R2Y2?   BTW, this engineer is dis-satisfied with most drawings he sees of the R2Y2 with two jet engines buried in the center fuselage above the wing and a nose intake replacing the propeller.  That long an intake would lead to thoroughly nasty inlet losses and flow distortions.  I find the side view from one old French magazine, with podded engines under the wings to be far more plausible.  Now, and advanced R2Y3 with fuselage engines and wingroot intakes I could see, but not what's commonly shown.
« Last Edit: October 18, 2012, 05:30:44 am by Stargazer2006 »

Offline lark

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1771
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #1 on: January 17, 2007, 11:11:36 am »
Hesham ,can you show us the sources of your information?

As far as I know , the so called 'Tenga' was not a real project but
only an idea in someone's mind about a jetpowered Ginga variant
but this aircraft was far to heavy for the Japanese jet engines at that time...

Offline hesham

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 22028
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #2 on: January 19, 2007, 08:29:58 am »
Sorry TsrJoe,

I have no drawings or data to them.

the Yokosuka Tenga became P2Y and there was also anther rocket aircarft
Mizuno Shinryo II .
« Last Edit: March 23, 2007, 11:16:49 am by hesham »

Offline Flitzer

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1002
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #3 on: February 07, 2007, 07:13:17 am »
Hi all...
Has anyone any information about the jet powered Kugisho R2Y2?

Was it army or navy?

Any idea of dimensions?

I culled from site the 3 version side view plate and would like to find a top view etc.

Many thanks
Peter
 ;D
"Madness is the normal condition, only interupted by spells of sanity"

Offline hesham

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 22028
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #4 on: February 07, 2007, 08:44:39 am »
Hi Flitzer,

the Kugisho R2Y2 was developed from R1Y1 and its name Keiun-Kai,
and it can carry one 800 kg bomb,it was designed for Navy of course,
also see;
http://www.j-aircraft.com/artwork/yokosuka_r2y2.htm

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #5 on: February 07, 2007, 10:58:45 am »
Hi Flitzer,

the Kugisho R2Y2 was developed from R1Y1 and its name Keiun-Kai,
and it can carry one 800 kg bomb,it was designed for Navy of course,
also see;
http://www.j-aircraft.com/artwork/yokosuka_r2y2.htm

*chuckle* For what it's worth, I put together the drawings of the R2Y2 that Richard Lewis Mendes used for that artwork.  I'll have to check back on the source article for the drawing, but I always found this engine installation far more plausible than the fuselage-mounted engines with nose inlet that some sources show; the duct losses in that inlet would be unreal, let alone the flow distortions that could occur.

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #6 on: February 07, 2007, 11:00:30 am »
Hi all...
Has anyone any information about the jet powered Kugisho R2Y2?

Was it army or navy?

Any idea of dimensions?

I culled from site the 3 version side view plate and would like to find a top view etc.

Many thanks
Peter
 ;D

From the designation, it was clearly Navy.  If I can find 'em, I'll be glad to supply you with the same data I supplied to Richard Mendes.  Drop me a PM or email if you're interested.

Best,
Evan

Offline Jemiba

  • Global Moderator
  • CLEARANCE: Top Secret
  • ****
  • Posts: 7872
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #7 on: February 17, 2007, 01:01:47 pm »
Sorry, I have no top view of the R2Y2, just of the R2Y1, for the R2Y2
it's just a side view. But I think, lenght and span were the same:
span 45ft, 11in, lenght 42ft, 9 1/4in, height 13ft, 9in, wing area
365.973 sq.ft
powerplant were two Ne-330 jet engines of 2.904 pounds thrust,
estimated speed  447 mph, range 2.180 miles at 287 mph, service
ceiling 32.800 ft.
(from RAF Review 04/59)
« Last Edit: February 18, 2007, 03:05:34 am by Jemiba »
It takes a long time, before all mistakes are made ...

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #8 on: February 18, 2007, 10:38:03 pm »
That's basically the side view I have, though mine's taken from a French article.  I'm still digging to find the drawings I made for Richard Mendes, I worked up a 3-view the basic aircraft and then a couple variations in line with other things the IJNAF was doing at the time.  As soon as I can find them, I'll make scans available.

Offline Flitzer

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1002
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #9 on: February 20, 2007, 06:06:08 am »
Many many thanks elmayerle.
Great stuff.

I've started a profile for one of the versions...
work in progress. I can't vouch for the accuracy of the camo scheme or markings.

Many thanks again
Peter
"Madness is the normal condition, only interupted by spells of sanity"

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #10 on: February 20, 2007, 01:53:28 pm »
Many many thanks elmayerle.
Great stuff.

I've started a profile for one of the versions...
work in progress. I can't vouch for the accuracy of the camo scheme or markings.

Many thanks again
Peter

The profile you're using is one I have real problems with.  The nose inlet, combined with the engine location, is going to make for very poor engine efficiency between duct losses and inlet distortion.  That's why I think the version shown in Jemiba's profile, with underwing engines, is far more probably.  Now, if you went with wing-root intakes, this engine location would work quite well, but with a nose intake, it's just plain asking for trouble, IMHO.

Offline Flitzer

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1002
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #11 on: February 20, 2007, 10:14:22 pm »
Hi elmayerle...

I agree with your comments.
When starting this one, I questioned the nose intake feeding two engines so far back, but this version is labelled as the most likely version that would have been selected for development on the Hikoki 1946 site.

But I hope to do profiles for all versions. The one illustrated just happens to be the first one out of photoshop... ;).

Again the scale views of the wing root intakes and the Me 262-esque underslung engines versions are exactly what I need. Many thanks.

Cheers
Peter
"Madness is the normal condition, only interupted by spells of sanity"

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #12 on: February 21, 2007, 08:19:21 am »
Well, I've often thought that the wing-root intakes of the high-speed versions of the Messerschmitt P.1099/P.1100 designs would be quite applicable here (if one wants to really speculate, a high-speed, swept-wing R2Y3?).  I'm still digging for my three views but I can send you the scanned French article with the side view I started from.  The party who scanned it for me did so in a pcx format; do you have a graphics program that can handle that?  If not, I'll convert to jpgs and send from home tonight.

Offline Flitzer

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1002
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #13 on: February 21, 2007, 08:39:35 am »
Again many thanks elmayerle.

You are a real help.

I use an old Mac at work...lunch times of course...so I'm not sure the pcx format will work.
So if you don't mind jpgs would be perfect.

Again many thanks
Peter
"Madness is the normal condition, only interupted by spells of sanity"

Offline elmayerle

  • Aerospace Engineer
  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1204
Re: Yokosuka (Kugisho) Keiun (R2Y1) and Keiun-kai (R2Y2)
« Reply #14 on: February 22, 2007, 10:37:47 am »
Again many thanks elmayerle.

You are a real help.

I use an old Mac at work...lunch times of course...so I'm not sure the pcx format will work.
So if you don't mind jpgs would be perfect.

Again many thanks
Peter


jpg's have been sent.  Scans of the drawings I did will be sent this weekend.  I'll also send an explanation of the variants I schemed up.

Best,
Evan