Dora engine sputters above 6000 meters and loses power, causing weird behaviour.

[Doughguy]

right, made a sp mission @NineLine

propper warm up 40deg oil with 1200 u/min then 1800 u/min when 70 deg coolant. vanilla mission surroundings.

after take off with 3250 u/min i keep climbing with 2500 u/min. droptank engaged

just above 6000 meters the engine starts sputtering.

dropped the tank thinkin it was empty despite the fule gauge saying otherwise, set fuel tanks to all. nothing. descended under 6000 meters. engine came back to live. 

however ata and u/min gave me weird readings. if id push throttle forward, ata would rise  max 1.3 ata, however. u/min would fall.

i could only push u/min to about 2200. then it would fall, even tho id fire wall it.
if i pulled back it would climb again to 2200 but fall again once i reached 1.1 or 1 ata. 

 

https://easyupload.io/76zz4b

 

im gonna retry with in air start and with and w/o tank to see what might cause it.

[zcrazyx]

3 hours ago, Doughguy said:

right, made a sp mission @NineLine

propper warm up 40deg oil with 1200 u/min then 1800 u/min when 70 deg coolant. vanilla mission surroundings.

after take off with 3250 u/min i keep climbing with 2500 u/min. droptank engaged

just above 6000 meters the engine starts sputtering.

dropped the tank thinkin it was empty despite the fule gauge saying otherwise, set fuel tanks to all. nothing. descended under 6000 meters. engine came back to live. 

however ata and u/min gave me weird readings. if id push throttle forward, ata would rise  max 1.3 ata, however. u/min would fall.

i could only push u/min to about 2200. then it would fall, even tho id fire wall it.
if i pulled back it would climb again to 2200 but fall again once i reached 1.1 or 1 ata. 

 

https://easyupload.io/76zz4b

 

im gonna retry with in air start and with and w/o tank to see what might cause it.

check the breakers and check for a fuel boost pump, cant remember if the dora has one but i remember in the 109 if it was off it would lose power and run rough

[Doughguy]

Well theres only the cb e58 or 85 that activates the pump for the drop tank. Its been on. Fuel selector lever was set to vorne zu. (Tho the manual gives contradictoray instructions on how to operate with drop tanks... fuel selector lever should be set to auf in one part and in another to vorne zu...)

I tried yesterday again with starting in midflight at 4000m and could climb past 6000 w/o probs. 

 

I checked starting procedures in case i fvcked up but that would cause a general engine malfunction and seizure of the engine.

So i dont know whats happening.

[Art-J]

If ATA and rpm shenanigans are present, then I feel this issue could be related in some convoluted way to the new engine bug reported in the other thread. A fix seems to be in the works already, so I personally wouldn't spend too much time testing the fuel system now if our current observations might become outdated after next patch (hopefully!).

[Doughguy]

I primarily want to rule out any pilot error first since im fairly new to the lawnmower.

ive checked the other bug thread but mine only occured after a cold start above 6000m.

ive also flew a simple sp sortie yester day w/o any problems but never above 6000m.

[Doughguy]

Another MP session.

now engine sputtered above 6000.

https://easyupload.io/eavih8

and another:, here ive stayed below 6000. engine loses power.

https://easyupload.io/2zw16y

 

On said instances ive made a cold start. Ill try to warm up the engine longer. Couldnt produce a engine failure from starting in air

Edited September 10, 2022 by Doughguy

[Hobel]

Am 10.9.2022 um 08:31 schrieb Doughguy:

I primarily want to rule out any pilot error first since im fairly new to the lawnmower.

ive checked the other bug thread but mine only occured after a cold start above 6000m.

ive also flew a simple sp sortie yester day w/o any problems but never above 6000m.

I will do some tests tonight and try to repeat the problem with this parameter. 

 

Thx.

[Hobel]

ok have tested and to me it looks like the bug in the other thread.

The pitch also stops again, so I would say we wait for the fix.

[Doughguy]

Ack.

Was flying in sp again yesterday. Started in air. 4000m. Basic combat for 20 mins or so. Alternated between 3000 u/min and 3250. With and w/o mw50. Stayed under 6000m.

Nothing.

Gathered from the other bug that the engine is actuall dying  whereas with this it looked at first as it would be starving fuel or so but then lost power on throttelin back.

 

Anyway. If its related to the other bug guesd the dora has to fly below 6k m.

 

 

[grafspee]

Dora can fly at high alt, i tested it climbing up to 10 km, but i used 3250 rpm for this so i can't tell how engine behave when you climbing at 2500rpm

 

Edited September 12, 2022 by grafspee

[Doughguy]

Yeah thats what got me confused. Once ive passed 6k meters engine started to gargle...  wasnt just once tho.

I cant see why it would damage the engine if i climb with 2500u/min at a shallow angle. Or 3000 u/min and a climb rate of 10.

[grafspee]

I'm not saying that flying at 2500rpm is killing engine, i am saying that i am just too impatient to climb so slow, so i always fire wall engine for climb

Will see if this fix will solve this problem

Edited September 12, 2022 by grafspee

[Doughguy]

Has anyone figured out how to avoid this in the meantime? Its really frustrating. 

It appears to me most of the times the bug occurs when doin a cold start and at flying a certain height. When i start in midair ive not stumbled over this?

Was in mp with a friend and and i could cruise around at 2400 u/min at about 2000 m height. But as soon as ive climbed to 5k ish (also with 2400u/min)  the engine loses power and wonky things start to happen. Eg can only go past 3000u/min in a dive. And even if i make a turn i loose u/min which i cannot regain.

Dora is basicaly unflayable....

Edited September 27, 2022 by Doughguy

[grafspee]

@DoughguyWhat you experience is exactly what was already reported, prop pitch is getting stuck at certain pitch and it won't change, and fixed pitch symptoms are exact things which you described which is unable to reach max rpm and rpm loose with air speed loos, it greatly handicap engine power.

Right now we have to wait for fix.

[Doughguy]

Yeah thought so.... is it possible to revert to a previous version?

@NineLine

 

i mean i wonder how this went into the stable version when it was know right after open beta update...

At that point a mate is tryin to persuade me to buy the anton... but the dora left a bad taste atm...

Edited September 27, 2022 by Doughguy

[razo+r]

Good thing is this issue has been primarly Dora only. 

 

But then again, having an engine issue for so many years sure does not shed good light on the WWII team of ED and ED in general. At least it does that for me.

[grafspee]

Thing is that DCS development accelerated recently but ww2 team wasn't upgraded, every time it happens more and more dev time need to be spend for module maintenance by ww2, at some point it would require 100% of it's available time to do so. 

This is why major bugs are slipped in stable version, because modern dev team is rolling like heavy train rolls down the hill.

I only hope that we will not have to wait 1 or 2 years for this fix, i really do.

Edited September 27, 2022 by grafspee

[Art-J]

4 hours ago, razo+r said:

But then again, having an engine issue for so many years sure does not shed good light on the WWII team of ED and ED in general. At least it does that for me.

Truth to be told, the governor issue is "only" three OB patches old, so still relatively brand spankin' new compared to the infamous "2700 RPM bug", which lived a two-years-long and happy life until squashed recently :D.

Lets hope this one ain't gonna last as much.

[Doughguy]

Well im no tech and i can barely land a plane, but just to get it right and try to understand it and to match with my observations.

Made another coldstart today climbed past 6k meters with 3000 u/min. all nice and peachy. could throttle back and forth, egine responded. Cooling flaps were in automatic.

However, once i dove down to the deck and throttled back, engine went bonkers.

So the prop overrevs and breaks the govenor?

[Hobel]

What are we talking about now?

OB or Stable?

 

There was a fix in the OB and in my first tets I could not find any problem yet.

 

https://www.digitalcombatsimulator.com/en/news/changelog/openbeta/2.7.18.30348/

[Doughguy]

Stable.

 

Anyway, good to hear its been fixed.

 

Edited September 29, 2022 by Doughguy

[Catseye]

It really, really would help everyone if when issues are posted that OB or Stable version be identified immediately. What a waste of everyones time.