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Old 11-12-2016, 02:41 PM   #1
dresoccer4
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Question Fuel Jettison

hey guys, quick question: what does the "Fuel / MW Jettison" knob do? i pull it, look outside my plane and see liquid pouring from my plane. im like "oh no i've just emptied all of my tanks onto the runway!" i try to push the knob back in, but it won't even budge. i check out my fuel indicator...but it isn't moving hmm. then i check outside again and the liquid has stopped being ejected. still can't push the knob back in. so i looked it up in the manual and it says that knob dumps the fuel from the rear aux tank, which doesn't hold that much fuel.

what is the purpose of this? can i continue my long flight after performing this?

P.S. quick, stupid secondary question: what is the big, curved intake sticking out from the left side of the engine? couldn't find it in the manual

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Old 11-12-2016, 02:55 PM   #2
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Quote:
Originally Posted by dresoccer4 View Post
what is the big, curved intake sticking out from the left side of the engine? couldn't find it in the manual
air for supercharger, if you mean that on the picture
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Old 11-12-2016, 03:10 PM   #3
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Originally Posted by saburo_cz View Post
air for supercharger, if you mean that on the picture
thanks
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Old 11-12-2016, 03:11 PM   #4
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Quote:
Originally Posted by dresoccer4 View Post
hey guys, quick question: what does the "Fuel / MW Jettison" knob do? i pull it, look outside my plane and see liquid pouring from my plane. im like "oh no i've just emptied all of my tanks onto the runway!" i try to push the knob back in, but it won't even budge. i check out my fuel indicator...but it isn't moving hmm. then i check outside again and the liquid has stopped being ejected. still can't push the knob back in. so i looked it up in the manual and it says that knob dumps the fuel from the rear aux tank, which doesn't hold that much fuel.

what is the purpose of this? can i continue my long flight after performing this?

P.S. quick, stupid secondary question: what is the big, curved intake sticking out from the left side of the engine? couldn't find it in the manual
109 have auxiliary Tank that's can hold Methanol-Water that's is sprayed direct in to the Supercharger or it's hold Fuel for increase Range.
When you change the knop to Fuel and fly around with MW 50 engaged supercharger is flooded with fuel should be kill the engine rather fast.
Doesn't know it this currently working in this way in DCS, possible your fluid spray come out of the intake hole, 109 doesn't have fuel dump switch.
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Old 11-12-2016, 03:50 PM   #5
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i think that dresoccer4 means No.59 on the picture and it is IMO fast drain MW/fuel tank (in emergency or fire? it was unprotected, so may be)

and u speak about No.4 what is battery ventilation??? but in DCS Bf it is switch between MW and fuel?
i can not translate it, i do not speak German

picture is from K-4 Flugzeug-Handbuch Teil 9A (1944)
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Old 11-12-2016, 04:17 PM   #6
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ah you are right Saburo never noticed there is a fuel dump switch, it's only for the auxiliary Tank not for the Main Fuel Tank.
No.4 means Valve block switch between fuel line to the Engine and supercharger spray.
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Old 11-12-2016, 04:19 PM   #7
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Quote:
Originally Posted by saburo_cz View Post
i think that dresoccer4 means No.59 on the picture and it is IMO fast drain MW/fuel tank (in emergency or fire? it was unprotected, so may be)

and u speak about No.4 what is battery ventilation??? but in DCS Bf it is switch between MW and fuel?
i can not translate it, i do not speak German

picture is from K-4 Flugzeug-Handbuch Teil 9A (1944)
thanks for reply. i do mean number 59 in the picture. you think it's for a fire? i can buy that
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Old 11-12-2016, 05:34 PM   #8
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Quote:
Originally Posted by MAD-MM View Post
No.4 means Valve block switch between fuel line to the Engine and supercharger spray.
yes, You are absolutely right, my fault...

and "Emeregency MW tank release valve" (this is called in one book about Bfs) allows to drain MW tank when pilot needs, so, fire can be that case... but not only of course

i tried it with MW50 inside and yes, i see liquid pouring from my plane too but when i set power to maximal with MW50 enabled, MW50 pressure gauge showed working system

it looks like you can drain MW tank but actually you do not do it and liquid will remains inside tank, i have no idea if it has any impact on flight model...
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Old 11-12-2016, 10:26 PM   #9
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Strange. I could swear I remember draining it by accident before and having it not work afterwards...
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Old 11-12-2016, 11:26 PM   #10
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Works as intended. It takes some time to drain though. Half a year our longer ago I tested this way if the MW tank content has an effect on the planes cog and it did.
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