Engine Nozzles and Tailerons after Shutdown

[bonesvf103]

One of the characteristics one sees when viewing a parked Tomcat is the right engine nozzle being stuck open and the left one closed. I noticed that after shutting down the Tomcat, both engine nozzles remain open. Does anyone know if Heatblur will be fixing that?

 

 

Also, characteristic of a parked Tomcat is the tailerons are angled up to "intersect" with the overswept wings, but in the sim they remain horizontal. Will this be fixed too?

 

 

v6,

boNes

[FoxTwo]

That is a characteristic of the TF30 A/A+ models, the B/D models with the GE F110 were parked as we see them in game.

[bonesvf103]

I just looked at some photos that I took of the F-14B and although there are some where the tailerons are horizontal and some where they are up, in all instances, the left nozzle of the F110 is closed while the right nozzle is open. It may not be as apparent as the TF30, but it is there. I even took one of VF-103's parked Tomcat before shutdown and after and you can see the nozzle close between the two pictures.

 

 

v6,

boNes

[FoxTwo]

I just looked at some photos that I took of the F-14B and although there are some where the tailerons are horizontal and some where they are up, in all instances, the left nozzle of the F110 is closed while the right nozzle is open. It may not be as apparent as the TF30, but it is there. I even took one of VF-103's parked Tomcat before shutdown and after and you can see the nozzle close between the two pictures.

 

 

v6,

boNes

 

It doesn't appear to be a 100% of the time thing.

 

http://cdn-www.airliners.net/photos/airliners/1/6/1/0819161.jpg

[bonesvf103]

Well I guess the difference between the airliners.net photo and the photos I took are the airliners.net photo appear to be the Tomcats in a maintenance state (could they have been purposeley made to be open or closed as needed for maintenance/troubleshooting) whereas mine were taken literally during the shutdown after a flight.

 

 

v6,

boNes

[Greyhound11]

well lets seem them pics!

[Blinde]

That is a characteristic of the TF30 A/A+ models, the B/D models with the GE F110 were parked as we see them in game.

 

Interesting. So why are those nozzles like that?

[r4y30n]

It's because of a shutdown step the real pilots did after shutting down the first engine but before the second, related to testing the hydraulic circuits.

 

http://www.anft.net/f-14/f14-detail-engine.htm

[draconus]

Also, characteristic of a parked Tomcat is the tailerons are angled up to "intersect" with the overswept wings, but in the sim they remain horizontal. Will this be fixed too?

 

 

Like this?

https://forums.eagle.ru/attachment.php?attachmentid=209860&d=1557231169

@latest OB

btw: It's not oversweep in the picture.

[bonesvf103]

Like this?

https://forums.eagle.ru/attachment.php?attachmentid=209860&d=1557231169

@latest OB

btw: It's not oversweep in the picture.

 

 

For the tailerons, yes!

 

 

v6,

boNes

[bonesvf103]

r4y30n and Draconus, yes, that is exactly what I'm talking about. The person who wrote that up was in F-14s...and he even said that the F110s acted the same way...which I saw and photographed while seeing them shut down the Tomcat...I may even have video. So, although just aesthetics at this point, it would be cool if the Heatblur DCS would do that. The Aerosoft F-14X for FSX does. There's something satisfying about seeing the engine close like that...

 

 

v6,

boNes

[r4y30n]

Do we know that we can't replicate the behavior right now? The link I posted sounds like it's referring to testing the hydraulic transfer pump after starboard engine shutdown.

[FoxTwo]

Do we know that we can't replicate the behavior right now? The link I posted sounds like it's referring to testing the hydraulic transfer pump after starboard engine shutdown.

 

I just tried it to see if it would.

 

Shutdown the starboard engine, disabled hydraulic transfer, waited for hydraulic pressure on the right to hit 0, then shutdown the port. No dice.

[r4y30n]

Alright, well it looks like we got a bug, then.

[draconus]

Alright, well it looks like we got a bug, then.

...but the tailerons work OK

Edited May 9, 2019 by draconus

[sLYFa]

Alright, well it looks like we got a bug, then.

I'm not sure if it's that simple. I've seen a lot of photos will both nozzels fully opened. Then there are ones with only one closed and some have them both partially or fully closed, whereas in the F-14A almost every photo has one closed and one opened. The engine section on anft.net describes pretty well why this behavior can be seen on the A models, it does not say that the F-110 nozzles should behave the same way (at least I didn't understand it that way). I also wouldn't necessarily expect the same behavior since the A's nozzles are operated hydromechanically (therefore not requiring electrical power) while the B's nozzles are electronically controlled by the AFTC. Hence, I wouldn't expect the nozzles to move at all after electrical power is lost (i.e. after shutting down the left engine) and thus remaining in whatever position it was before shutdown, which is mostly fully opened.

[fat creason]

I discussed the nozzle issue with one of our SMEs, according to them the F110 nozzles generally close when oil pressure needed to actuate them drops below a certain amount. When the AFTC comes online at 59% RPM in PRI mode, the nozzle opens as the engine spools up. At idle, the throttle should keep the nozzle open if AFTC remains in PRI mode.

 

In some cases it may blow open if oil pressure fails. I may add that eventually but for now the nozzles close on oil pressure loss.

 

F110:

 

 

The TF30 nozzles are actuated via fuel pressure. They seem to stay in position or blow open if fuel pressure is lost in the AB fuel pump.

 

TF30:

Edited May 17, 2019 by fat creason