Can someone explain the LA-5's shudders??

[GridiroN]

Hey guys,

 

Just bought the LA-5 on sale, but I'm having difficulty moderating the engine performance and temperature...Can someone explain how the shudders, oil rad and mixtures work. The Intake shudder seems like it needs to be open 100% of the time...the oil radiator doens't seem to do anything without the oil rad, and the mixture seems to effect the LA-5 a lot more significantly than other planes. I have not yet figured out what use the outlet shudder is...

 

Help?

[ShamrockOneFive]

Oh... right, I think you mean shutters. I'm not sure because I mostly fly on Normal mode as Expert is still scary. I was expecting to be talking about the aircraft shuddering in tight turns and that's from the higher wingloading and presumably from the leading edge slats deploying which are mostly smooth but I find I feel a little shake or shudder just as they deploy.

[GridiroN]

Yea, sorry, I meant shutters. 

 

I also meant to say "the oil rad doesn't appear to do anything unless the intake shutters are open". Wing shudder isn't a problem, lol.

[Maxyman]

When in combat or climbing (RPM = 2400 or around): inlet - 100% open, oil - 100% open, outlet shutters up to the motor temperature, they affect the speed significantly.

If in economy mode or cruising (lower RPM), you might want to close everything to keep the motor warm.

 

Mixture - 100% unless saving fuel.

[GridiroN]

When in combat or climbing (RPM = 2400 or around): inlet - 100% open, oil - 100% open, outlet shutters up to the motor temperature, they affect the speed significantly.

If in economy mode or cruising (lower RPM), you might want to close everything to keep the motor warm.

 

Mixture - 100% unless saving fuel.

 

Does the game model any actual penalties for keeping the engine cold?

 

If you close the outlet cowl shutters, where does the inlet cowl shutter air go? Wouldn't that cause tremendous drag having the inlet open, but the outlet closed?

 

I'm not quite sure what you mean to tell me I should be doing with the outlet shutter...

[LukeFF]

 

 

Does the game model any actual penalties for keeping the engine cold?

 

Your engine can seize up if you run it at too high of RPMs for too long. 

[-TBC-AeroAce]

It's an air cooled engine so there is a Coul flap and water or oil cooler I forget which one. Engine management is quite easy, I keep throttle at 100% most of the time and adjust rpm to keep the temperature low, also this engine has boost that u will need to assign to a key, use boost to 2000 after that use supercharger second gear.

[GridiroN]

Your engine can seize up if you run it at too high of RPMs for too long. 

 

Right, but that's after running the engine too hot = RPM too high

 

It's an air cooled engine so there is a Coul flap and water or oil cooler I forget which one. Engine management is quite easy, I keep throttle at 100% most of the time and adjust rpm to keep the temperature low, also this engine has boost that u will need to assign to a key, use boost to 2000 after that use supercharger second gear.

 

Interesting. It has an oil rad, and no water rad. Cowl flap intake controls the temperature of the turbine, which is why I'm not understanding what cowl outtake does, or where the wind goes when it's closed. 

[Maxyman]

Does the game model any actual penalties for keeping the engine cold?

It's a good question, you can give it a test if you like. I've never done it. Historically M-82 was a very hot engine.

If you close the outlet cowl shutters, where does the inlet cowl shutter air go? Wouldn't that cause tremendous drag having the inlet open, but the outlet closed?

In theory nowhere, there will be no airflow at all, it's equivalent to keeping your inlet shutters completely shut. In reality the outlet shutters were not possible to shut completely by design.

I'm not quite sure what you mean to tell me I should be doing with the outlet shutter...

Cylinder temperature should not exceed 215C, oil temperature should not exceed 85C. If the cylinder temperature increases you need to open your outlet shutters. Ideally, outlet shutters should be around 10-50%, keep it in mind that they are similar to air brakes (they affect your speed). Does that make sense?

 

As AeroAce has mentioned M-82 is a radial air cooled piston engine, the only thing you can control to cool it down is the airflow. Higher air speed increases airflow, fully opened shutters increase airflow as well (but affect the speed).

[Matt]

Even with fully closed outer shutters, there still a gap for the airflow.

 

The inner shutters should only be closed in a long low power dive (landing approach for instance) to prevent over cooling or when heating up the engine before take off.

[-TBC-AeroAce]

Cold effects may be present irl but I don't think they are modelled or even apply. For example irl if u put a prop engine with a carburettor to idle you have to engage carb heat(a flap that diverts hot air over the carb) in order to stop the carb freezing and stoping fuel going to the engine.

 

So yes the engine getting cold can be a big problem but whether it effected the aircraft in Bos I do not know as they all have different systems and engine types

Edited December 24, 2014 by AeroAce

[GridiroN]

Hey, forgot about this over Christmas break. Thanks for the help guys. I figured it out with your help.

[Willy__]

For those asking if the game models or not damage to the engine due to extreme cold I dont know, but try to do a very long and shallow dive with all the rads open and you see an icon on technochat about overcooling the engine, but I've never pushed it to far to see if it actually damages the engine.