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| Question for Tainan Kokutai and Japanese enthuiasts http://bhlanding.ient.com/warbirdsforum/viewtopic.php?f=8&t=178 |
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| Author: | bollok [ Wed Sep 06, 2017 7:27 am ] |
| Post subject: | Question for Tainan Kokutai and Japanese enthuiasts |
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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| Author: | -sakai [ Wed Sep 06, 2017 2:33 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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. bollok wrote: 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 ? 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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| Author: | -sakai [ Wed Sep 06, 2017 3:15 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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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| Author: | bollok [ Wed Sep 06, 2017 4:57 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
sure. no question on the A6M3. |
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| Author: | Robert [ Wed Sep 06, 2017 5:17 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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 |
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| Author: | grumpy [ Wed Sep 06, 2017 6:43 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
Robert some of what you want is here. https://drive.google.com/open?id=0B-ehX ... WZ0dDRkSUU |
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| Author: | Robert [ Wed Sep 06, 2017 7:42 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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. |
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| Author: | -sakai [ Wed Sep 06, 2017 8:32 pm ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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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| Author: | -sakai [ Thu Sep 07, 2017 12:29 am ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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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| Author: | grumpy [ Thu Sep 07, 2017 1:41 am ] |
| Post subject: | Re: Question for Tainan Kokutai and Japanese enthuiasts |
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 |
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