Propeller Production in Japan

[elbmc1969]

Perhaps this should go in Stories, since it's a first-person account, but the information on the progression of Japanese propellers from fixed-pitch to variable pitch to constants speed seemed too valuable. The specific foreign licenses are interesting, especially using a Ratier design fairly late in the war!

What the Japanese Bayberry Trees Have Seen Stories from the Early Years of Yamaha Motor - Yamaha Motor History | Yamaha Motor Co., Ltd.

Introducing the stories behind Yamaha Motor's technologies.

global.yamaha-motor.com

 

[Shinpachi]

Impressive article.
If I may add, Sumitomo paid all the balance royalties to Hamilton after the war was over.
I don't know about other companies but could have done so under the situation.

 

[MikeMeech]

Perhaps this should go in Stories, since it's a first-person account, but the information on the progression of Japanese propellers from fixed-pitch to variable pitch to constants speed seemed too valuable. The specific foreign licenses are interesting, especially using a Ratier design fairly late in the war!

What the Japanese Bayberry Trees Have Seen Stories from the Early Years of Yamaha Motor - Yamaha Motor History | Yamaha Motor Co., Ltd.

Introducing the stories behind Yamaha Motor's technologies.

global.yamaha-motor.com

Hi
'Japanese Aero-Engines, 1910-1945' by Goodwin and Starkings, has the following reference propellers:

From this it appears that the Ki-84 was equipped with Ratier type propellers, which were a four bladed CS propeller.

Mike

 

[elbmc1969]

From this it appears that the Ki-84 was equipped with Ratier type propellers, which were a four bladed CS propeller.

Yep. This rather video is really slow in places, but has interesting information about the significant limits of the Ratier prop on the Ki-84. It also digs out the problems with the so-called "flight test" performance figures for the Ki-84. (I found the link here in a discussion of Greg's videos on the Ki-84.
View: https://www.youtube.com/watch?v=L12PNyii7hw