grafspee

It is even more weird because spitfire does not have aileron trim

The most important question is , can you replicate this, maybe you encountered some bug You can up load track from your mission here, i or someone else take a look.

P-51D and TF-51

Off is neutral position, cooling shutters stops moving and stays where they are at that moment. At this position cooling shutters won't move even when temps exceed limits. You should think not about shutters but about shutter actuator motor, you can open up, close down or stop. Close = actuator motor will start closing shutter doors, if you hold it for long enough it will move shutter to closed position Open = same thing as close but other way around Off = shutters motors are turned off Automatic = shutter motors are controlled by thermostatic control unit this will unload task from pilot by maintaining safe oil/coolant temps with in coolers capabilities.

3000rpm is continuous power, 3250 30min. Ata is not good power reference because it will rise and fall with alt changes, also at high supercharger gear ata limits are different.

Engine quit, do you mean that engine stopped completely or just loose power ? If engine/prop stopped completely, it mean that engine seized up and engine is dead no way to restart it. If the engine/prop still spinning but not producing thrust, this mean that you probably run out of fuel, in piston engines there is not such thing like flame out.

Maybe some pp are not acquainted with KPH but 400 KPH is roughly 240 MPH, at this speed P-51 will not pull much G as well. When you are flying P-51 and you can see 400 on your speed gauge you can do anything, if you are in Fw190 400 on speed gauge not so much.

@amazingme Maybe release D-13 with D-9 upgrade would be more feasible then redoing all just for free. I got your point now, till recently Ed claimed that cooling model is ok, sometimes ended with heated topics, but after release of new cooling, cooling turned out to be whole new world, so i am so convinced that old birds really need FM revisit asap.

Oil temp is scaled to 100C but god knows who high it can go actually. Max temp of oil in P-51 is 95C as manual, it is mentioned in part about WEP use, it can get to 95 for 5 min or so. If oil temp stops at 100C you probably go away with it, if it goes higher like up to 150C then engine won't last long

I found old bug report which was reported but it contains same issue, oil temp way above limit just does not do anything. It isn't tagged as fixed tho.

@Hobel If we talk about coolant max operation temperature, the main limiting factor back in ww2 was design of coolant radiator, germany with poor radiators design could run up to 100C in early B-109 and spitfires could run up to 130C which forced Germans to use double size of radiator to provide same cooling. So coolant temp limit is related mainly how high pressure cooling system can operate. But for engine it is very little difference, only what happens is that coolant pressured is safe guarded by pressure vent so when you overheat you start loosing coolant and at some point heat transfer deteriorate and engine dies due to internal overheat. Oil does not boil at temps below 200-300C so boiling oil off is not an option, what happens is at some point it stops lubricate engine and it kills engine much faster. Oil behavior is quite strange, try inverted flight and oli pressure remains steady whole time, manual states that 10s is max, prop governor stops working which indicates that oil supply to governor is stopped but oil pressure gauge remain unchanged.

I can only confirm what @Art-J said, openbeta with no mods.

In game settings you don't have such precision in adjusting sounds, so you can't increase tires sound level independently.

This still match what happened to me, if you look you will notice rapid ATA drop, but governor does nothing still pitch remain unchanged so rpm drops. Something weird going on here Go back to my video and scroll to 4:20 and watch it closely i disengaged MW50 and after 1 s it happens exactly MP dropped even more and rpm dropped too It looks like complete engine control unit major failure, what is causing ATA drop i have no idea at same time governor stops working too, let assume that it is engine loosing power due to cooling issues but why suddenly governor stops working, everything lead to MGB unit for me.

This is good point. But before latest patch those speed were unavailable for P-51 sometimes even for 46/2700 rpm, i could only dream to climb mil power at 170mph now i can do it, finaly.

I will divert a little bit but flying P-51 at 26 C OAT was PAIN before this update. Just check it, oil dilution sill don't work in P-47 Mosquito and Spitfire has oil pressure gauges scaled from 0 to 120 psi, US counterparts have rang from 0 to 200 so it look a lot less drastic in US planes but oil pressure behavior improved a lot after this patch.

I just recall one thing, in manual of P-51 in part dedicated cold weather, there is dedicated shutter which had to be installed in cold weather time, in winter for example, i think we will need that sooner or later.

I was flying Mosquito couple times to day and it warms up pretty well, and oil temp is steady just above 60C in flight at moderate power range, gets hotter in climb at high power.

Probably pitch stuck at value at the moment when fail happens so it may differ for each test fly.

Spitfire's cooling wasn't updated in last patch so it is as always been.

Someone was right, it is prop governor which fails here https://drive.google.com/file/d/141XT5SAXAWiroQNAEaI-HnV8LGN1dS14/view?usp=sharing This is my track, what happen to me was not engine fail but it could be MGB or governor fail, Engine was running fine but prop pitch was stuck at 47 degrees which resulted in very low engine rpm in flight, i managed to land DORA i shut engine off and i managed to restart it so engine it self looked fine. I hope that ED will address this issue quickly, it looks like the bug even worse then this old engine fail bug, i just hope we won't have to wait years for the fix. At this stage Dora is unflyable again.

Those advices were created by players who have flown P-51 in DCS, and after many trails this conclusion was established, those speed limits were determined by cooling system which in previous iteration wasn't able to provide enough cooling for engine below those speeds Recently Open Beta DCS received new cooling physics with coolant boiling simulation and right now P-51 cooling system is very much improved and this speed problem is pushed away. Right now you can climb mil/wep power at rated 175mph for best climb. Right now you can put cooling shutters in AUTO mode just like every single P-51 manual states, with out warring about cooking your engine during take off or during fierce combat. But you need to be on OPEN BETA version to experience it, if you are using STABLE VERSION old cooling physics is still there so old speed limits are still valid. Maybe it is bad idea but, i think it would be good thing to tag Posts Open/Stable, so ppl would not get confused, many players use Stable only

Dora was doing that before this updated too, in very high speed dive engine was over revving, due to governor hitting pitch limit on the prop.

Are you running MGB in emergency mode, because those ATA vs rpm figures are way off 1.7ATA at 3000rpm and 1.55 and 2600rpm way too much ATA for those rpms. And unfortunately i can't see temps

Those time limits on engine are for engine life time, because engine was designed to work through many hours of flight so manufacturer says if you want this engine run fine through 600hours you need to do this and this. Exceeding time limits do not mean immediate failure.