Random Engine failure in Su-27 with random failure dissabled

[TaxDollarsAtWork]

Despite me not having the setting enabled while doing a touch and go my engine set aflame

 

 

 

Did I violate some restriction? it seems unnatural

Su-27 Random Engine Failure.trk

[GGTharos]

Bird strike?

[TaxDollarsAtWork]

I do not have birds enabled no

Seems to also have happened in the J-11

 

 

I checked my settings, I did have birds enabled to max for some reason though I've never seen a bird in my life in this game

 

 

I guess that solves that issue

Edited August 7, 2020 by TaxDollarsAtWork

[rrohde]

I checked my settings, I did have birds enabled to max for some reason though I've never seen a bird in my life in this game

 

They are not modeled in 3D, but the probability of them getting ingested into your engine is modeled and represented by that slider.

[draconus]

They are not modeled in 3D, but the probability of them getting ingested into your engine is modeled and represented by that slider.

 

Otoh there are 3D flying birds in DCS but they don't have collision model and won't strike your engine/aircraft.

[ACME_WIdgets]

Despite me not having the setting enabled while doing a touch and go my engine set aflame

 

 

I've seen it happen also, mostly below 1000m AGL. No bird strike, etc. in my settings.

I've also seen it happen when inverted, especially prolonged inverted, steady flight (-1G).

Edited August 19, 2020 by ACME_Widgets
added AGL to be clear

[GGTharos]

The inverted flight is because you're draining the feed tanks so the engine has no more fuel. You need +g to get them filled.

[Ironhand]

 

I've seen it happen also, mostly below 1000m AGL. No bird strike, etc. in my settings.

I've also seen it happen when inverted, especially prolonged inverted, steady flight (-1G).

Engines in flames? Or engines die?

[ACME_WIdgets]

Engines in flames? Or engines die?

 

 

Engines die.

 

Slight push forward on stick in level flight does sane thing. Spool down to. About 60% then start up on their own.

[draconus]

Engines die.

 

Slight push forward on stick in level flight does sane thing. Spool down to. About 60% then start up on their own.

 

That's correct - answered in #7.

[einarabelc5]

On 8/19/2020 at 1:24 PM, GGTharos said:

The inverted flight is because you're draining the feed tanks so the engine has no more fuel. You need +g to get them filled.

So wait a minute. This has been happening to me for a long time. I thought it was because when your plane loses energy pulling further back on the stick actually stalls it even more and I figured there's no AIR flow into the turbo fans so the engine literally runs out of oxygen to burn and turns off. I haven't looked at the track here but it is very annoying when you're in the middle of a dogfight and are going vertical and your plane all of the sudden turns the engines off. It takes about 30 seconds minimum and you're a sitting duck then. It can go from 200 Km/h to 90 km/h very quickly.

 

Can someone give a non-cryptic NON one liner detailed explanation of what's going on. A paragraph should suffice to avoid confusion. Also, does this happen to other plane models in a similar, non exact way? Thank You!

 

P.S. I've never seen the Su-57 Felon do that, but that's an unofficial model that can flight into space practically.

Edited December 7, 2020 by einarabelc5
wrong noun

[GGTharos]

There's nothing cryptic about it, the feed tanks need +g to be filled.  If you're at 0g or -g, the engines will drain them but there will be no flow into those tanks to the engines are starved of fuel.

 

How fast the feed tanks are drained depends on throttle setting - AB will obviously eat that fuel up very quickly.

[draconus]

@einarabelc5Same behavior in F-14 or F-15 in prolonged inverted flight or negative G. Normal in jets. Special tank installation is applied for aerobatic jets like ex. Blue Angels use.

If it happens to you it means you put your stick forward too much, too often. Beside small corrections, nose down is a no-no for fighters. I thought the risk of inverted stall is punishing enough for the pilots of Su-27/33.

[einarabelc5]

On 12/6/2020 at 7:18 AM, GGTharos said:

There's nothing cryptic about it, the feed tanks need +g to be filled.  If you're at 0g or -g, the engines will drain them but there will be no flow into those tanks to the engines are starved of fuel.

 

How fast the feed tanks are drained depends on throttle setting - AB will obviously eat that fuel up very quickly.

Is not cryptic when you know. I get the gist though, same idea that I had but with fuel not air. Thanks!

 

P.S. I just reread my original post, that had a few critical mistakes. I need to stop posting so late :S

Thanks again!

43 minutes ago, draconus said:

@einarabelc5Same behavior in F-14 or F-15 in prolonged inverted flight or negative G. Normal in jets. Special tank installation is applied for aerobatic jets like ex. Blue Angels use.

If it happens to you it means you put your stick forward too much, too often. Beside small corrections, nose down is a no-no for fighters. I thought the risk of inverted stall is punishing enough for the pilots of Su-27/33.

Well, I like to stall on purpose at 18,000 ft :D.

 

I do remember that this behavior was already in place on LOCK ON or Flanker 2.0

Edited December 7, 2020 by einarabelc5

[DarkFire]

On 12/6/2020 at 10:10 AM, einarabelc5 said:

Can someone give a non-cryptic NON one liner detailed explanation of what's going on. A paragraph should suffice to avoid confusion. Also, does this happen to other plane models in a similar, non exact way? Thank You!

 

Unlike many modern fighters the Su-27 does not have a pressurised fuel system. It relies on gravity feed, so to keep fuel flowing to the engines you must be >0g. The caveat to that is that the Flanker fuel system has a 500Kg cache tank. I can't remember off hand what the fuel flow rate is at various throttle settings but at high speed and low altitude the 500Kg of fuel in the cache tank will be drained literally in seconds, especially when afterburner is engaged.

 

If your engines flame out and you catch it fast enough and apply positive g before the RPM spools down too low the engines will usually restart themselves. If you're low & slow the only options are a rough field landing or to eject.