reported P-51 engine does not quit when overheated

[ShadowFrost]

20 hours ago, OLD CROW said:

Could be plausible. I attached the track thinking they could recover it somehow. Maybe it was only my hunch... who knows... track is corrupted. Let's see how all this will develop also when all A/C's got the FM-DM reviewed. Cooling system is an step forward the way it has been implemented, but needs some fine adjustments. 

I have not looked at the tracks involved in this thread. But for reference, the P-51 can survive at least 7 minutes of oil overtemp on the ground. So 50 inches max rpm (higher power setting will nose over) for approximately 7 minutes once passing redline of the oil. 

Edited September 14, 2022 by ShadowFrost

[Hobel]

vor 2 Stunden schrieb ShadowFrost:

I have not looked at the tracks involved in this thread. But for reference, the P-51 can survive at least 7 minutes of oil overtemp on the ground. So 50 inches max rpm (higher power setting will nose over) for approximately 7 minutes once passing redline of the oil. 

 

The oil in p51 dcs has no effect on overheating, you can fly in the red as long as they want, the only thing to watch out for is the coolant.  That's the way it is at the moment. 

 

Btw, For such tests you can use the active pause , without nose down.

Edited September 14, 2022 by Hobel

[=475FG= Dawger]

High oil temperature does not, on its own, create an engine failure or even engine damage in a real engine unless operated for extended periods due to reduced protective properties.

It is a symptom of another issue, an indicator of a problem elsewhere. 

[ShadowFrost]

5 hours ago, =475FG= Dawger said:

High oil temperature does not, on its own, create an engine failure or even engine damage in a real engine unless operated for extended periods due to reduced protective properties.

It is a symptom of another issue, an indicator of a problem elsewhere. 

The number of engines I've seen die in racing would likely say otherwise... But in the traditional sense.. Yes high oil temp is indicative of another issue and will not be your primary threat to engine failure for aircraft. 

8 hours ago, Hobel said:

The oil in p51 dcs has no effect on overheating, you can fly in the red as long as they want, the only thing to watch out for is the coolant.  That's the way it is at the moment. 

 

Btw, For such tests you can use the active pause , without nose down.

 

Not sure why I didn't think of using active pause on the ground. Thanks 

Edited September 14, 2022 by ShadowFrost

[NineLine]

Yeah I think that it should, it should not be instant in most cases, but running an engine with oil that is extremely hot and oil thinned should end in a bad day if not addressed ASAP (ie RTB and not pushing the engine)

[ShadowFrost]

29 minutes ago, NineLine said:

Yeah I think that it should, it should not be instant in most cases, but running an engine with oil that is extremely hot and oil thinned should end in a bad day if not addressed ASAP (ie RTB and not pushing the engine)

Mostly agreed, however, in the DCS environment, a small amount over redline ~5C could likely be ran for the duration of the sortie on a fresh engine and only be a maintenance concern otherwise. IRL (not WW2) I know of radials being ran near or at oil redline at METO for a significantly longer duration than allowed without adverse effect. Obviously not something you would want to do often... but the situation neccesitated it. Though this is second hand knowledge so take it with a degree of error. 

However, larger overtemps will reach the thermal breakdown point as the oil is 30-50C hotter than indicated within certain areas of the engine and 270F is generally regarded as the breakdown point for mineral oils. So at that point... the longer you run the larger your risk of a critical component having oil that cannot do the job intended. But generally speaking that can and should be avoided. 

Edited September 14, 2022 by ShadowFrost

[NineLine]

For sure, mild overheating should not impact the engine. It needs to be more about extreme temps and continuing to push the engine hard. 

[Hobel]

vor 7 Stunden schrieb =475FG= Dawger:

High oil temperature does not, on its own, create an engine failure or even engine damage in a real engine unless operated for extended periods due to reduced protective properties.

It is a symptom of another issue, an indicator of a problem elsewhere. 

yes well but that is the case? you can close the oil cooler completely in the DCS P51 the needle goes all the way to the stop and you can fly until the fuel runs out, without problems.

We are not talking about a short rise, who knows how hot the oil actually is, the display only goes up to 100°C.

[grafspee]

This issue was reported more then year ago, but overheating oil was not a common thing before patch since coolant would over heat much much faster and blow engine up, but after new cooling patch things changed. Now everyone encounter this bug because coolant temps stays within limits, oil temp become a problem, it rising and rising but there is no consequences of over heating oil, ok you can ride long time on 100C oil but since oil gauge ends at 100C we can't say is it 100C or 150C or 200C, if you get your oil to 150C thing will be quite different.

Early P-51Ds like -5 had this type of instrument panel

Late P-51Ds like -25 -30 should have late instrument panel variant which looks like this and corresponding engine limits are different too.

Look at max oil temp 90C for early and 105C for late quite a difference isn't it ?

By having this late oil temp gauge scaled up to 150C would clear out a lot of things

 

Edited September 14, 2022 by grafspee

[NineLine]

Can you link the documents these are from, even if just the names, I will ask if we need an updated gauge. That said, the oil temps are reported as I said above.

[grafspee]

Those are paid documents so i think i can't re upload them but i will show front pages

First is from this

Second is from this 

The second one shows early and late instrument panel versions, the most distinguish difference is that in late airplanes instruments are mounted on plate not like in early mounted from behind, probably to make replacement much easier. I'm not saying that every late plane had this late oil temp gauge, late production models could use old gauges as well if any shortages appeared. I only say that it would be nice to have it

Edited September 15, 2022 by grafspee

[NineLine]

Thanks, I might already have them.

[NineLine]

Sorry guys I forgot to update this as reported, I apologize. Its been reported for a while now.