Leaning in IL-2 BoX...

[Guest deleted@50488]

I am still not sure about how accurately IL-2 BoX models the need for proper mixture management at least with altitude.

 

In aircraft where I don't have the option to make the mixture be controlled automatically ( Russian Fighters / Bombers ) I wonder if the sim is modelling the effects of leaning correctly ?

 

I've been trying to notice power changes when leaning at higher altitudes, for instance in the LagG3 and the Yak-1 and 7B, but it appears to have no noticeable impact.

 

I can't offer more precise data - measurements - right now, but I'm just trying to get your opinions on this particular engine modelling feature.

[Riderocket]

me too, i am very confused by mixtures, i always leave them at 100% except the Mig-3 and IL-2. (where mixture works as boost)

[6./ZG26_Klaus_Mann]

As long as the Superchargers provide a full Charge of Air no leaning is necessary.

 

-The Mikulins all have Auto Rich and Auto Lean, what you see as the 100% and 50% Setting. Anything Below that is either for Economy or Extreme Altitudes where the Auto Lean doesn't cut it anymore. 

 

-The Shvetsovs are Auto Rich and Manual Lean. But you only need that above 6000m. 

 

-The Klimovs are completely Manual Lean. But you only really need to once the Charge Drops above 4500m. Since you're running the Engine at Full Power most of the time they are running Very Rich most of the Time Anyways, and Reducing the Mixture mostly Effects Temperature, and Power really only once you move the Lever quite a lot. 

I think moving the Mixture makes about 10-15kph of Difference. 

 

On most German Aircraft there is a "Dead Spot" on the Throttle for about 5% Movement where there are no ATA changes. Normally around 1.15 or 1.25 ata. This is when the Engine goes into Auto Lean. On the Ju-88 this means Fuel Consumption will Drop by about as much as 60 Liters an Hour. 

[Guest deleted@50488]

Hey Klaus, thanks for the detailled description!

 

So, I should be able to notice CHT / EGT increasing as I lean in the Klimovs - I can only find a CHT gauge in the La-5s... I could probably use Water Temp as a reference on the Yaks ?

Edited April 9, 2017 by jcomm

[Riderocket]

As long as the Superchargers provide a full Charge of Air no leaning is necessary.

 

-The Mikulins all have Auto Rich and Auto Lean, what you see as the 100% and 50% Setting. Anything Below that is either for Economy or Extreme Altitudes where the Auto Lean doesn't cut it anymore.

 

-The Shvetsovs are Auto Rich and Manual Lean. But you only need that above 6000m.

 

-The Klimovs are completely Manual Lean. But you only really need to once the Charge Drops above 4500m. Since you're running the Engine at Full Power most of the time they are running Very Rich most of the Time Anyways, and Reducing the Mixture mostly Effects Temperature, and Power really only once you move the Lever quite a lot.

I think moving the Mixture makes about 10-15kph of Difference.

 

On most German Aircraft there is a "Dead Spot" on the Throttle for about 5% Movement where there are no ATA changes. Normally around 1.15 or 1.25 ata. This is when the Engine goes into Auto Lean. On the Ju-88 this means Fuel Consumption will Drop by about as much as 60 Liters an Hour.

+1