investigating Fuel FLow Rate & External Tanks

[NorgeNate]

I've noticed that the external fuel tanks are feeding fuel too fast at full burner and low altitude. It is my understanding that each external wing tank feeds at approximately 15,000 lbs/hr (30,000 combined) and the centerline feeds at about 18,000 lbs/hr. It is a known thing to watch out for in the real world as being in burner too long could potentially starve the internal reservoirs causing a flame out or, at the very least, a trapped fuel condition. There are more in depth technical aspects to this but I think this bit of info will suffice. Cheers!

[BIGNEWY]

Hi

 

thank you for the observation, the team is currently tweaking fuel flow and testing internally.

 

thanks

[NorgeNate]

I hate to bump this but I just did a bit of a test and it looks like the fuel transfer rates have gotten worse. I was getting 80000 pph in full burner at altitude on the Nellis map. That's way off. It's been nearly 2 years since I posted this bug and not much has been done. Any word on this or is it still just WIP? 

Fuel Transfer Test.trk

[BIGNEWY]

Hi,

I will ask the team in the morning, 

Please understand that early access is a very long process your patience is appreciated. 

[NorgeNate]

Thanks Bignewy!

Sorry, I didn't mean to come off as impatient. I was just curious if anything was being done. I understand all of the hard work going into to this sim and appreciate everything you guys do.

Cheers!

 

[Deano87]

17 hours ago, NorgeNate said:

Thanks Bignewy!

Sorry, I didn't mean to come off as impatient. I was just curious if anything was being done. I understand all of the hard work going into to this sim and appreciate everything you guys do.

Cheers!

 

Just to clarify, you’re not talking about engine fuel flow rate are you? Just the transfer rate out of the drop tanks into internal fuel correct? 

[NorgeNate]

5 hours ago, Deano87 said:

Just to clarify, you’re not talking about engine fuel flow rate are you? Just the transfer rate out of the drop tanks into internal fuel correct? 

My original complaint was about the xfer rates from the external tanks but now it applies to the total fuel flow rate as well. They have said it's a WIP but it's been a while now. I get that they have quite a bit to do and I won't pretend to know what happens behind the curtain but I thought 2 years would have been more than enough time. 

I'm even curious as to why the external wing tank model hasn't been modified yet. Most everyone knows that it's a single piece unit and not a seperate tank and pylon and when jettisoned  the pylon and tank separate from the wing as one unit. 

[Deano87]

 

7 hours ago, NorgeNate said:

My original complaint was about the xfer rates from the external tanks but now it applies to the total fuel flow rate as well.

You comments piqued my interest. Just did a few high speed runs and compared it to the real docs.

NTTR - Standard day - 15C - 29.92 - Full Afterburner acceleration, fuel usage measured in lb per hr.

40k ft

Mach - DCS - IRL

1.0 - 19K - 20k

1.2 - 25k - 26k

1.4 - 33k - 32k

1.6 - 37k - 37k

1.8 - 40k - 40k

2.0 - 42k - 40k

 

20k ft

1.0 - 50k - 49k

1.2 - 60k - 58k

1.4 - 66k - 68k

1.6 - 72k - 74k

1.8 - 76k - 74k
 

This was on latest Open Beta and seems pretty accurate to me to be honest. 

Edited October 27, 2021 by Deano87