Engine Flame Out?

[Heroshrine]

Can my engines flame out because of TOO much air? (For planes)

[Chibbity]

No.

[Jupiter3927]

Engines only flame out when they don't have enough fuel (or air for jets).

[Heroshrine]

Originally posted by Jupiter3927:

Engines only flame out when they don't have enough fuel (or air for jets).

then why are my jumbo engines flaming out? The other ones don't, and these DEFINITELLY have fuel, cus when i slow down they start back up. I had an INSANELY high amount of air intake though, cus i was going almost 3000k/s. Ill post a picture in a min.

[Heroshrine]

https://steamcommunity.com/sharedfiles/filedetails/?id=1508338953

[Heroshrine]

idk if it was combining al of them, or for each one, but either each of the fuel tank intakes or combined had 512, each of the jumbo engines had either 715 each or combined, and the supersonic ones had like 1200 each or combined. Again, i don't know if its combining all the similar parts or not. But then why are my engines flaming out??

[Chibbity]

You're going too high? Those engines perform best at lower altitudes.

They will flame out around 20k typically. Ideal operational height is around 10-15k.
https://wiki.kerbalspaceprogram.com/wiki/J-90_%22Goliath%22_Turbofan_Engine

Also, you have an absurd amount of intakes. You need like 1 or 2 per engine at most. There is no benefit to having more than you need.

[Heroshrine]

Originally posted by Chibbity:

You're going too high? Those engines perform best at lower altitudes.

They will flame out around 20k typically.

Also, you have an absurd amount of intakes. You need like 1 or 2 per engine at most. There is no benefit to having more than you need.

ik i have waaaayy 2 many. but im getting enough air, so why should it flame out?

[Chibbity]

Originally posted by Heroshrine:

Originally posted by Chibbity:

You're going too high? Those engines perform best at lower altitudes.

They will flame out around 20k typically.

Also, you have an absurd amount of intakes. You need like 1 or 2 per engine at most. There is no benefit to having more than you need.

ik i have waaaayy 2 many. but im getting enough air, so why should it flame out?

It'll flame out once you get too high up and the air is too thin for the engine as I explained.

The Goliath is a low altitude engine.

[Heroshrine]

Originally posted by Chibbity:

Originally posted by Heroshrine:

ik i have waaaayy 2 many. but im getting enough air, so why should it flame out?

It'll flame out once you get too high up and the air is too thin for the engine as I explained.

The Goliath is a low altitude engine.

and as i explained it had enough air, so why should it flame out if it has enough air?

[Aranador]

because it doesnt have enough air?

[Heroshrine]

Originally posted by Aranador:

because it doesnt have enough air?

*facepalm*

[TheWolfDrone]

The guy did seriosuly answer you, even if you have enough air intake, no matter what, certain engines just STOP when getting to certain points. They are not made to work in certain area's. From the wiki on that particular engine. " As with all jet engines, its thrust decreases significantly with altitude. Its maximum stationary thrust is rated at 360 kN at sea level. At about 8,000 m it generates just 132 kN, and at about 15,000 m it generates no more than 37 kN, ceasing to work entirely at about 20,900 m, which is somewhat below the 'Wheesley'. " Key point being it stops working at a certain point. You can have a lot of air intake but if the engine itself cannot handle the height it will not matter.

[Maeng]

Science, kids. It's good to know.

[Heroshrine]

Originally posted by TheWolfDrone:

The guy did seriosuly answer you, even if you have enough air intake, no matter what, certain engines just STOP when getting to certain points. They are not made to work in certain area's. From the wiki on that particular engine. " As with all jet engines, its thrust decreases significantly with altitude. Its maximum stationary thrust is rated at 360 kN at sea level. At about 8,000 m it generates just 132 kN, and at about 15,000 m it generates no more than 37 kN, ceasing to work entirely at about 20,900 m, which is somewhat below the 'Wheesley'. " Key point being it stops working at a certain point. You can have a lot of air intake but if the engine itself cannot handle the height it will not matter.

k

[RoofCat]

engines flame out at altitude too high and at velocities too high. Rapier for example will stop propelling you at ~1752m/s if flown at ~23km (where it is cold enough to do so).
While above sea it can reach 1950+m/s, but there is just one way to reach speeds as high in stock game and not blow up afaik and you still won't be able to pass 2000m/s most likely.

So it is both your velocity and air density (depends on altitude and temperature). On Kerbin even best airbreathing engines flame out at ~29km. On the only other oxygen rich world - Laythe they do so around 37km for some reason. Probably there is more oxygen or tricky pressure math (colder air further from Sun and thus denser gas?). Or just for the gameplay so you have it easier with Laythe SSTO.
And then each engine has internal performance curve.

Like there are rocket engines optimized for vacuum and asl, every jet engine has different optimal speed range. You can google for real life designs with different chamber configurations and stuff, read about engines that start to work above Mach4 only and so on - if curious. KSP is much more forgiving and already cheating a lot. But there are still some gameplay based challenges left within the game so it is not completely fake.