Yak-9 Fuselage Vent

[alfakilo]

I haven't found an explanation of what this "vent" is in late model Yak-9s. It seems to be moveable from nearly flush to extended as shown. There are two of them just forward of the ventral inlet. Can anyone help?

 

[Crimea_River]

Odd place for a "vent" - right in front of the rad intake. But maybe that's a clue.

 

[Wurger]

This is the outlet of the oil radiator.

 

[vikingBerserker]

Very cool. I thought it was some type of shield to prevent dirt and rocks being sucked into the intake behind it while on the ground.

 

[fubar57]

May or may not be what we are looking for. Caption says, "The details of the dust filter is visible in the lower right corner of the photo."

 

[Wurger]

I see. As memo serves thare were two such outlets with the possibility of opening and closing depending on the temperature. Both were at the fuselage undersides and located symmetrically. The same way of oil cooling was used for the Yak-3.

 

[fubar57]

......and then Mushroom says its an oil cooler outlet

 

[fubar57]

From this book...

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Google translate says, "Oil cooler curtains"

 

[Crimea_River]

Why would you take warmed air from the oil cooler and dump it into the coolant radiator?

 

[Wurger]

From this book...

View attachment 644436
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Google translate says, "Oil cooler curtains"

View attachment 644435​

It is exactly the same I stated in the post #3.

 

[Wurger]

Why would you take warmed air from the oil cooler and dump it into the coolant radiator?

Actually these didn't that as much as it could be expected. Both outlets were located on the sides of the main radiator.

the source: the net.

 

[vikingBerserker]

Ok, that makes a lot more sense, thanks!

 

[Wurger]

Also we may say that the outlets worked a little bit like the de-icing system.

May or may not be what we are looking for. Caption says, "The details of the dust filter is visible in the lower right corner of the photo."

View attachment 644434​

Just a note .. the main water radiator in the pic is of an early Yak-9 with the oil radiator mounted at the front bottom M-105 ( VK-105 ) engine cowling. Together with the engine M-107A ( VK-107A) introduced for powering of the late Yak-9, I mean the Yak-9U, the main radiator was moved more back and the oil one was relocated almost to the place where the main water cooler had been mounted ealier. In the way the Yakovlev OKB got more streamline front of the fuselage. What is more the main radiator was put deeper into the fuselage in a very similar way the P-51 Mustang had.