Bf109G-2 Overheat and Radiator Dynamics

[6./ZG26_Klaus_Mann]

Basic rule seems to be.

Overheat never: 10-15% radiators in level flight

Overheat once (30 seconds): 50% radiators on Automatic

Overheat twice: 100% radiators and engine dies 2 minutes later

[Finkeren]

Que?

 

Care to elaborate on what you mean?

[6./ZG26_Klaus_Mann]

Que?

 

Care to elaborate on what you mean?

Swithcing between fast flight and auto rads, the radiators become far worse after just overheating once for between 10 and 30 seconds.

[FuriousMeow]

When you are overheating you are probably causing the fluid in the radiators to over heat, steam out, and leave less coolant available in the radiators to cool as effectively.

 

That's the way the radiators in RoF worked, when overheating for too long they steam out and become less effective due to less coolant.

[Finkeren]

FM: That makes some sense, but shouldn't we then see the steam leak out as a very noticable white trail, the same way we do in RoF?

[FuriousMeow]

Sure, if the visual part has been put in here. However, some things weren't brought over. Like the early morning/evening mist.

[=EXPEND=Tripwire]

Klaus, there appears to be a bug with the warning messages disappearing. I reported it a few patches ago.

 

On the topic of 109G2 radiator dynamics though,

 

I overheated twice during my last sortie in the 109g2, both in identical situations.

Map was Veliki luki, Winter - Wings of Liberty server.

 

Climbing from 4k to 5.5k at 1.32 ATA auto radiators with a Yak on my 6.  I was shocked to see the overheat message. Switched to manual radiators, and they were only open ~30%?!

 

Surely the G2 shouldn't be running into overheating issues on the winter maps with auto radiators.

[FuriousMeow]

Klaus, there appears to be a bug with the warning messages disappearing. I reported it a few patches ago.

 

On the topic of 109G2 radiator dynamics though,

 

I overheated twice during my last sortie in the 109g2, both in identical situations.

Map was Veliki luki, Winter - Wings of Liberty server.

 

Climbing from 4k to 5.5k at 1.32 ATA auto radiators with a Yak on my 6.  I was shocked to see the overheat message. Switched to manual radiators, and they were only open ~30%?!

 

Surely the G2 shouldn't be running into overheating issues on the winter maps with auto radiators.

 

You were on a MP server. That same server had planes throwing contrails at 0meters. From take off up until high alt. Because MP servers can control atmospheric conditions.

 

MP servers are not a basis for determining anything, they have full control over just about everything for the atmosphere. The only same conditions are QMB, same map, same alt, same everything. QMB, so far, is the only absolute for testing.

Edited December 6, 2015 by FuriousMeow

[=EXPEND=Tripwire]

Out of curiosity I just dug the WOL online mission up out of my ./data/multiplayer/dogfight folder and loaded the msnbin file into the editor. Time stamps matched the record on the WOL stats page.

 

Atmospheric conditions were -

Level m: 0

Temperature deg c: -15

Pressure Mmhg: 760

[FuriousMeow]

I don't use technochat so "overheat" message means nothing to me. It's shameful that "technochat" is allowed in "fully difficulty"/"expert" settings. Very sad actually that anyone even knows of that on those servers.

 

I've not destroyed a 109's engine since the new temp change. So I don't know about the messages, I guess I could turn technochat on but if the engine doesn't crap out does it matter, especially when watching the coolant radiator gauge? Unless of course you are climbing at some angle that is causing less speed which thereby causes less airflow which then causes less cooling.

 

Maybe there's a bug with the technochat. More importantly - why the hell is it allowed on "Expert" servers?

[Reflected]

I've never overheated the 109's engine with auto rad...

 

The update didn't only make wider openings less efficient, but now the thermostat is programmed to maintain 102 C instead of 85 C like before. So on summer maps where 102 C is easily reached we have more drag now, but where it's cooler, the rads are more closed than before.

Edited December 6, 2015 by Reflected

[=EXPEND=Tripwire]

but where it's cooler, the rads are more closed than before

 

 

This does not appear to be the case at all.

 

I'm finding the radiators are more open in winter than they were previously, so I don't believe this is true.

 

Auto radiators used to maintain ~85deg c in winter with only 2-3degrees of radiators open. Its now 10degrees open to maintain 100degrees in winter. Regardless of what is actually correct, they are now required to be open more across the board.

Edited December 6, 2015 by Tripwire

[6./ZG26_Klaus_Mann]

Well, I fly on manual a lot for testing. On manual it's impossible to cool down the engine from overheat, no matter how wide they are opened.

Just overheat the engine on purpose once, for short durations.

You'll find that in Manual mode it will inadvertenly overheat, even with reasonably large openings.

[Reflected]

Well, I fly on manual a lot for testing. On manual it's impossible to cool down the engine from overheat, no matter how wide they are opened.

Just overheat the engine on purpose once, for short durations.

You'll find that in Manual mode it will inadvertenly overheat, even with reasonably large openings.

 

I see what you mean so I ran some extensive tests on the summer map at 1000m altitude. I flew level at full throttle with the G-2 and auto rads. It never overheated or exceeded 50ish % opening. So I closed it manually and let it overheat. It did, so I opened the rads manually and voilá, it cooled down. I closed it again to let it overheat - opened again, it cooled down.

 

Then  I ran some speed tests at 100m. In March 1943 it did 525 at sea level. Ours does the exact same on the autumn map. On the summer map I managed to reach 514 with manual rads (as the real test was run by the way) keeping things below 115 C, and around 500-505 with auto rads.

 

I didn't see anything wrong, maybe the fact that summer vs autumn costs the 109 20-25 kph. If it's the same for the Yak and other planes, then  I wouldn't be bothered by this either.

[=EXPEND=Tripwire]

I performed a test of my issue on the same map using QMB, Winter.

 

109G2, full fuel 500m from ground.

Set radiators to auto. Get water up to current temperature (100deg) - then commence a climb at 290kmh.  Overheat message appears around 5k (radiators were around 45% open when i flicked from auto to manual briefly) and then goes away at about 7k.

Edited December 6, 2015 by Tripwire

[III/JG2Gustav05]

G2 is still fine per my experience. But F4 gets overheat all the time in Summer map.  

[Trinkof]

Do you guys overheat in continuous power (1.2 ATA) or only in combat setting?

 

From my experience, 109 overheat quickly in combat power, but if you leave them at 1.2 for anything except fighting, it is fine, and engine cool down after decrease of admission pressure.