WW2 Japanese Propeller Airscrew Research.......

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xylstra

Airman 1st Class
197
58
Jul 9, 2014
The Propeller Airscrew is often the poor orphan to the piston-engine that spins it when it comes to research popularity. Without doubt you only have to read most of the posts on this forum and others to see where the predominace of interest lies. My specialist interst is aero-engines and don't we all like the technical nuances and the sheer power..... 1,000Hp.....2,000Hp......3,000Hp and on, upward! Hell, why stop? Make it 5,000,000 Hp - it doesn't matter how many zeroes you keep adding you won't be going anywhere fast if you can't then translate the avalanche of power into useable thrust: and that requires a propeller. Why is it then that a great deal of military and for that matter, civilian technical research is often ignored? Granted, this forum site and others have occasionally described some of the propeller types used in WW2 combat aircraft but these references are still fairly sparse and are predominantly American/British/German. One would be lead to think that perhaps these were the only belligerent nations that fought in WW2.
But "Where, Oh where" are the Japanese in all of this? I want to know what research their aeronautical researchers got up to in WW2!! Surely, someone must know (post-war American technical intelligence reports, perhaps?). You only have to scrutinise the 6-bladed propeller installed on the KYUSHU 'Shinden' J7W1 as but one example to realise that there is a lot more to learn of this little-known area of Japanese aviation research. And what about the propellers that their long-range 'America Bomber' aircraft projects would have used. All of this must have been a massive amount of experimental investigation.
I want to know more.......!
 
Yup there are some USSBS reports on this tho the only ones I know of at present are
  • Standard specifications for propellers. 8816221
  • Blueprints of propellers. 8816148
  • Functional analysis (of propellers). 8816220
To access these you need to go to https://dl.ndl.go.jp/info:ndljp/pid/ and type the accession number in after pid/

You can search for more using this
1578083186095.png


Note the search button will be orange until you click it and this shows where you change the language to English.
If you just want USSBS reports enter your search keyword(s) and add +ussbs after - the search engine is excellent even if you are searching using English.
You can also try Japan Center for Asian Historical Records - I find the search engine pathetic, even when you have found a file before and know its title on the jacar site it is often unable to find any file with any of the keywords from the title.

If you find more please post here
 
Yup there are some USSBS reports on this tho the only ones I know of at present are
  • Standard specifications for propellers. 8816221
  • Blueprints of propellers. 8816148
  • Functional analysis (of propellers). 8816220
To access these you need to go to https://dl.ndl.go.jp/info:ndljp/pid/ and type the accession number in after pid/

You can search for more using this
View attachment 565739

Note the search button will be orange until you click it and this shows where you change the language to English.
If you just want USSBS reports enter your search keyword(s) and add +ussbs after - the search engine is excellent even if you are searching using English.
You can also try Japan Center for Asian Historical Records - I find the search engine pathetic, even when you have found a file before and know its title on the jacar site it is often unable to find any file with any of the keywords from the title.

If you find more please post here
Hi 'MiTasol', Thanks so much for that. That site does indeed provide some fascinating detail. I can tell I will be spending quite a few more hours delving into what else is also there!
Thanks again. Cheers, Xylstra.
 
Sidebar: my old flight instructor (19mumble-mumble) had an analysis of prop design/evolution that concluded the Wrights' ultimate configuration was about 90% the efficiency of the Piper Cherokee and Cessna 150...
 
Sidebar: my old flight instructor (19mumble-mumble) had an analysis of prop design/evolution that concluded the Wrights' ultimate configuration was about 90% the efficiency of the Piper Cherokee and Cessna 150...
Hi Barrett, probably scale-factor effects at work. Propeller design often seems very arcane: more art than science. Xylstra.
 
Xylstra
I guess you have found it by now, a drawing of the 6 bladed propeller is shown in the Japanese archive. Not dimensioned and it does not include the blade details. The inner workings of the hub are present.
 

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