P51 engine managment

[mastershotgun]

Hi guys, can anyone advice me on proper engine management? For 2 days in a row when I flew a default mission I would kill the engine. I did warm it prior departure and flew on cruise according to limitations. Around 27 rpm and about 45-46 mp. After about 20 min engine just dies, in the log it says engine overrevved. Is it a module bug or am I doing it wrong? Any help would be appreciated. Update: I noticed the mission weather is only +4 C, and during flight, carb. temperature dropped below green mark. Is it related? Should I warm engine more on ground before take off under certain weather conditions?

 

Not sure if they really answered your question yet. You need also have good airflow to prevent overheating. The thing is that your carburetor never get a chance to overheat, because the heat is transferred by the oil and the oil is cooled by the air. But if you do not get enough airflow the oil get hot and it gains viscosity, becomes fluid like water, stop lubricating engine and will end in seized engine... To prevent that you need airflow...No matter the air temperature. So the RAM air open and speed over 200 knots, 250 if you want to be sure...

[nikita_nomad]

 

Not sure if they really answered your question yet. You need also have good airflow to prevent overheating. The thing is that your carburetor never get a chance to overheat, because the heat is transferred by the oil and the oil is cooled by the air. But if you do not get enough airflow the oil get hot and it gains viscosity, becomes fluid like water, stop lubricating engine and will end in seized engine... To prevent that you need airflow...No matter the air temperature. So the RAM air open and speed over 200 knots, 250 if you want to be sure...

 

Thanks for advice. Should I keep radiator controls auto or open when in action? I mean when ground attacking or dog fighting.

[grafspee]

 

Not sure if they really answered your question yet. You need also have good airflow to prevent overheating. The thing is that your carburetor never get a chance to overheat, because the heat is transferred by the oil and the oil is cooled by the air. But if you do not get enough airflow the oil get hot and it gains viscosity, becomes fluid like water, stop lubricating engine and will end in seized engine... To prevent that you need airflow...No matter the air temperature. So the RAM air open and speed over 200 knots, 250 if you want to be sure...

 

I am not sure what you just said but, ram air has nothing to do with oil temp(Ram air system is part of engine inlet, air which goes through ram air is used in combustion). Ram air handle offers to position ram air or filter operation, second one open option for carb heat. Carb inlet air can overheat in hot day, reducing engine power and increasing chance detonation to happen. Second thing higher air speed will heat up carb air temp so if you want keep it low fly slow :) or switch to air filter operation when carb temp is above temp limit.

Another thing in P-51 speed is shown in MPH not in KTS keep it in mind.

46' and 2700 is continuous/climb power and optimal climb speed is around 170mph indicated, this is sufficient speed to keep coolant and oil temp with in limits in normal temps, in very hot day reducing power may be required.

[nikita_nomad]

 

I am not sure what you just said but, ram air has nothing to do with oil temp. Ram air handle offers to position ram air or filter operation, second one open option for carb heat. Carb inlet air can overheat in hot day, reducing engine power and increasing chance detonation to happen. Second thing higher air speed will heat up carb air temp so if you want keep it low fly slow :) or switch to air filter operation when carb temp is above temp limit.

 

I'm getting confused now. :) is it really simulated in such detail?

[grafspee]

 

I'm getting confused now. :) is it really simulated in such detail?

 

Yes it is :)

but carb air temp will be high only in very hot day, in temps around 4C it will be far with in limits no matter you do :)

[mastershotgun]

 

Thanks for advice. Should I keep radiator controls auto or open when in action? I mean when ground attacking or dog fighting.

 

You should keep it on auto. The thing is that if the oil is cold than it looses viscosity, meaning it is too dense and do not flow so good. So this is why you have "happy medium" for optimal performance. This is the auto radiator does, keep closing and opening for oil to have the desired temperature.

[mastershotgun]

 

I am not sure what you just said but, ram air has nothing to do with oil temp(Ram air system is part of engine inlet, air which goes through ram air is used in combustion). Ram air handle offers to position ram air or filter operation, second one open option for carb heat. Carb inlet air can overheat in hot day, reducing engine power and increasing chance detonation to happen. Second thing higher air speed will heat up carb air temp so if you want keep it low fly slow :) or switch to air filter operation when carb temp is above temp limit.

Another thing in P-51 speed is shown in MPH not in KTS keep it in mind.

46' and 2700 is continuous/climb power and optimal climb speed is around 170mph indicated, this is sufficient speed to keep coolant and oil temp with in limits in normal temps, in very hot day reducing power may be required.

 

Nope. No offense, but this is just wrong. The functions of those two levers is writen in the manual which comes wiht the plane. You can read it your self...

[grafspee]

 

Nope. No offense, but this is just wrong. The functions of those two levers is writen in the manual which comes wiht the plane. You can read it your self...

I advice to read it again then.