109 on WEP overheat issues

[coopes]

Hi

 

I fly all 3 modules no alliegence here. Fly latest 1.5 version and noticed 109 has gotten very good.

Made a video which i can upload where on wep nose pitched incredibly slow airspeed engine will not overheat. I was recording for at least 6-7 minutes. I finally broke the engine by running 1.8 ATA without wep.

 

Conditions

I was able to pitch up roughly 25/30 degrees at 1.8ATA ON WEP. once my airspeed bled off i got stick and rudder in correct position to hold this nose pitched position at roughly 150kph IAS. I was able to still climb although extremely small amounts and my plane felt like it would pivot slowly around to the right as if i was a helicopter applying some tail rotor.

Coolant did move the needle up then kind of went steady. I held this position for 7-8 minutes with no overheating That would lead to a failed engine.

 

I would have assumed i was lacking some serious airflow to cool the engine. I was under 5K and towards the end of video got just over 5K.

Edited August 26, 2016 by coopes
Clarity

[rel4y]

By running without WEP, do you mean running without MW50 at 1.8 ata? I have noticed there is a random generator at work, sometimes the engine breaks after 10 s sometimes after 2 minutes. If youre coolant overheats it will blow instantly though. Try manually shutting the rads and climbing steeply and you will encounter this easily as soon as the coolant reaches critical temps. On the other hand one rad is enough to provide cooling at full power, if you use the shutoff valve to close one rad they will open a bit wider and you can pretty much still fly full power at level depending on outside temps of course. The rads where a bit oversized.

Edited August 26, 2016 by rel4y

[coopes]

My main issue is not overheating after a long period of time at such a low speed. On max power. I also as a side note think its impressive i can hold the nose pitched at such a low airspeed for a long time also

[rel4y]

Well if your coolant temps are ok you wont blow the engine. If the coolant flaps open fully open you will have immense cooling capabilites, but also immense drag. That is why the engineers limited the cooling flap opening to 220 mm at one point, because it was creating excessive drag without being necessary. If the coolant overheats, evaporation enthalpy will keep it steady for some limited amount of time while excess vapor which can not be recondensated in the vapor trap is being released by an overpressure valve. Until the coolant amount has decreased so far that sufficient cooling is not possible anymore, one hopefully has noticed the steady stream of vapor exiting the engine.

 

Have you looked at TAS via pressing Ctrl + Z twice? Am I understanding your Problem correctly?

[Brigg]

no I don't think you understood properly rel4y. What coopes is saying is that you shouldn't be able to do it, without overheating your engine.

[rel4y]

Well, thats why I am asking at what speed this occurs and what the coolant temps are... Because if you dont know these two basic params then what is this complaint based on? Female intuition?

[Brigg]

150kph in a vertical climb I think he said to me the other day, and it just hung there.

[coopes]

I will post the video. The coolant according to the manual is over limit at the altitudes I was. The whole time my nose is pitched up sitting there at 150kph. Do you not think it's odd a plane generating 2000hp rads at auto can keep a plane cool for 8 mins at a constant 150kph?

[rel4y]

Ok, I think I see what you are talking about. Though below 160 kph IAS I stall after a few seconds and the nose drops. This depends on altitude and fuel load, I was using 100%. Cooler flaps are fully open and temps quickly rise above the sustainable levels. If I close one rad the engine overheats pretty quickly within 10 seconds and streams smoke.

 

The real question is if the cooling capabilities of the rads are sufficient to cool the engine at WEP/MW50 while fully open at a certain TAS. Then it is important at what altitude this happened as the external temperature and air density are factors at well.

 

I think olny Yo-Yo can tell us these params.

 

Edit: In the vid, please enable Ctrl + Z and show the TAS.

Edited August 26, 2016 by rel4y

[coopes]

Decided to compare all 3 planes on a climb with low airspeed max power wep.

 

For all 3 i started on the deck pitched up into climb, airspeed drops to which i try and hold it to a certain airspeed as best i can.

 

For 109 i was climbing from deck at 1.8 wep, roughly around 150-170kph never overheated got to 7K got bored. Rads on auto.

 

Then i took the dora out from deck same rough IAS as 109 1.8 wep with radiator fully open. Got to 6K showing no signs it was going to overheat so stopped.

 

Took out the mustang climbing from deck at roughly 100 - 110 mph IAS. 67" with wep rads auto. Gets hot pretty quick made it to 4K engine popped due to over heat.

 

Now to comparison between german and american engine cooling is huge. Is MW50 really just a magic pill?

[IronJockel]

I tested it myself and i can get the engine to overheat pretty quick.

I did this in the free flight quick start. First one is me overheating the engine by prop hanging and the second is me flying with full flaps down below 200 kph IAS.

 

 

http://www.file-upload.net/download-11892396/DCS_Kurfrst_Overheating_Test_IronJockel.mp4.html