Yokosuka P1Y Ginga ("Frances") Variants and Projects

zzy2001 said:
1. TR30 is exactly NE30
2. There are actually 4 jet variants except Tenga. They are：the jet Kyokko，the jet version of Ginga Prototype 3（jet engine was on the fuselage），the jet version of P1Y7（ginga type 15）that use TR10 or Hatsukaze motorjet，and the test base for Tenga
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What is the source for the P1Y7? (Not that I don't believe you, I'm just curious.)
 
TR10 and Tsu-11 engines had an extremely low thrust that is not suitable to propel an aircraft larger than Kikka, even with two units (and Kikka is very small, two TR10 was still pushing it).

In mid-1944, the Navy had official plans for the development of the Ginga Ro ("Ginga Rocket" -> Jet Ginga) and Kyokkō Ro, as well as the Tenga.

Ginga Ro and Kyokkō Ro are informal names, and were the Ginga or Kyokkō equipped with the TR10 or Tsu-11 jet engines. These engines are much too weak to be used as a main powerplant and are only auxiliary.

Both the Jet Ginga and Jet Kyokkō were to use a single TR10 or Tsu-11 fitted inside the belly for auxiliary propulsion. Because of this, I would consider the Ginga Prototype #3 that was used as a Tsu-11 aerial testbed to be effectively the prototype of the "Jet Ginga".


On the other hand, Tenga was a complete remodel of the Ginga with twin TR30 engines as the primary and only propulsion. The TR30 on paper was to have almost 3 times the thrust of TR10 and was suitable. Tenga is described in the Navy's 1944 prototype plan (according to a secondary source) as a "fighter-bomber", so it can be assumed that it was to have forward armament as well.

TR10-series and TR30 were abandoned at the beginning of 1945, and these projects were suspended. We could probably consider that the Keiun Kai (R2Y2) as a project superseded the Tenga in late 1944. In the very beginning, the Keiun Kai also was to use TR30, but the plan changed to use TR330 (Ne-330).


P1Y7 is new to me, and it does not appear in the Navy's designation list document of April 1945. I would assume that it was a provisional designation for the Jet Ginga with auxiliary TR10/Tsu-11.
 
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QAZ said:
TR10 and Tsu-11 engines had an extremely low thrust that is not suitable to propel an aircraft larger than Kikka, even with two units (and Kikka is very small, two TR10 was still pushing it).

In mid-1944, the Navy had official plans for the development of the Ginga Ro ("Ginga Rocket" -> Jet Ginga) and Kyokkō Ro, as well as the Tenga.

Ginga Ro and Kyokkō Ro are informal names, and were the Ginga or Kyokkō equipped with the TR10 or Tsu-11 jet engines. These engines are much too weak to be used as a main powerplant and are only auxiliary.

Both the Jet Ginga and Jet Kyokkō were to use a single TR10 or Tsu-11 fitted inside the belly for auxiliary propulsion. Because of this, I would consider the Ginga Prototype #3 that was used as a Tsu-11 aerial testbed to be effectively the prototype of the "Jet Ginga".


On the other hand, Tenga was a complete remodel of the Ginga with twin TR30 engines as the primary and only propulsion. The TR30 on paper was to have almost 3 times the thrust of TR10 and was suitable. Tenga is described in the Navy's 1944 prototype plan (according to a secondary source) as a "fighter-bomber", so it can be assumed that it was to have forward armament as well.

TR10-series and TR30 were abandoned at the beginning of 1945, and these projects were suspended. We could probably consider that the Keiun Kai (R2Y2) as a project superseded the Tenga in late 1944. In the very beginning, the Keiun Kai also was to use TR30, but the plan changed to use TR330 (Ne-330).


P1Y7 is new to me, and it does not appear in the Navy's designation list document of April 1945. I would assume that it was a provisional designation for the Jet Ginga with auxiliary TR10/Tsu-11.
Click to expand...
It came from Bunzo Komine San who wrote the magazine
 
This is the ORIGINAL fuselage assembly done by Nakajima Hikouki KK at 1944. I found this file within the US captured Japanese air technical documents with microfilm form. This document only consist this graph however it is extremely rare and important because R1Y Gyoun，P2Y Tenga ，and P1Y2-S Kyokko all share the same fuselage as Ginga
Please use this JPEG and PDF if you like！
a289b668b13925aa037d50da6aa0eac1.jpeg
 

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