Lots of speculation on whether the A6M2 had float type carb or not that cut out under neg-g manouvers.

When the USA rebuilt and tested the A6M2 in WW2,
it is claimed that they must have installed the carb incorrectly, so this is why it cut-out.

Do you have anything concrete to substantiate either way ?

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In all my readings over the years (decades), I do not recall ever reading that any Reisen model had a similar cut-out issues like the early Hawkers.

I will do some searching and post back with references.





Is there a reference for this? The TAIC report on the Akutan zero does not reference this, If I recall correctly.

EDIT: - Previous Thread on this topic:

http://forum.totalsims.com/viewtopic.ph ... 9&start=15

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~Sakai - 坂井
daimyosakai@gmail.com
Tainan Kokutai - 台南

Akatombo | White 576 | Curtiss AVG

https://forum.warthunder.com/index.php? ... arburetor/

Check out Kitsune's post. He talks about a down-draft float carb that prevented neg-g cutout. Sakae 21, I think

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Akatombo | White 576 | Curtiss AVG

sure. no question on the A6M3.

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Also for our anyone who speaks Japanese:
How would you write these words in Japanese (with English letters)?
Power for lift off = ?
Take-off power = ?
War emergency power = ?
Rated Power = ?
Military Power = ?
Nominal Power = ?
Maximum continuous power = ?

Or what words did the Japanese use for these boosts settings?

Cheers and hopefully we shall soon see fully revised A6M's in Warbirds !
/Robert

Robert some of what you want is here.

https://drive.google.com/open?id=0B-ehX ... WZ0dDRkSUU

Ty sir, it's only in Japanese letters though, need Japanese translation in English letters (game can't handle other symbols in the HUD). Not sure if I dare to fully trust Google translate.

OK - Ive checked the following resources:


IJNAviator1937-45
RAAF Directorate of Technical Services Detail No. 119/A/30 for the MK. II (HAP) [A6M3 for our purposes]
JICPOA 5981
Curtiss P40C vs. Model 21
Spit Vs. Zero - A.L. Walters Group Captain, No. 1 Fighter Wing, RAAF - Darwin

J-Aircraft.com
Warthunder
WWII Aircraft Performance
Wiki

And several other sites using various queries like Sakae 12, Sakae Development, Mitsubishi Engines and other terms.

Conclusion:

There are no easily found documented anecdotes stating the SAKAE 12 engine suffered from cut-out in negative G maneuvers. Compare this to the fact that the Hawker engine cutout is widely documented and cited. The absence of even one resource citing a negative g cutout makes me think that it was not a characteristic of the down-flow carb.

I do recall, within the last four or five years, seeing a diagram / animation of a schematic carb with the neg. g. issue, versus a downdraft version. I will continue on with this...


EDIT - This YT Video also does NOT mention negative G cutout - where if it was a characteristic of the Zero, they would have mentioned it...Certainly.

https://www.youtube.com/watch?v=teXzEti5PVY

Still reading this:

http://www.wwiiaircraftperformance.org/ ... -dec42.pdf

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~Sakai - 坂井
daimyosakai@gmail.com
Tainan Kokutai - 台南

Akatombo | White 576 | Curtiss AVG

So this Intelligence Summary 85 from December 1942 mentions Neg G cutout for the SAKAE 12.

However, there are several sites and forums that state the initial tests had the carb installed incorrectly in the Akutan Zero. I do not know if this report was the one made with the alleged incorrect positioning carb.

Of importance to note - Nakajima designed the downdraft carb for the SAKAE 21 (If I am remembering this correctly...read a lot of this shit tonight).

Also to note - the SAKAE was the IJN version of the HOMARE for the IJA. Again, if I remember this correctly.


EDIT - I cannot upload a pdf...so give me a day or two to get this uploaded.

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~Sakai - 坂井
daimyosakai@gmail.com
Tainan Kokutai - 台南

Akatombo | White 576 | Curtiss AVG

Early Japanese aircraft engines used float carburetors. That means they were susceptible to neg-G fuel delivery problems. It would take a pressure type carburetor to prevent a power loss in neg-g situations.

This report on the Sakae 12 engine say it has a float type carburetor.

http://www.wwiiaircraftperformance.org/ ... ort-24.pdf

This report states the A6M2 does have neg-g problems.

http://www.wwiiaircraftperformance.org/japan/p5016.pdf

FWIW