Simviation Forum - Does anybody know what these vents on the F18 do?

Dec 4^th, 2011 at 9:21pm

Dave71k Ex Member

I was setting up for a shot for my round the world trip and I noticed these 2 vents popping up n down in the back of my f18 I've never noticed them before and was wondering what there for? Does anybody know?

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Reply #1 - Dec 4^th, 2011 at 10:04pm

FSX_Dude Offline
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FSX need any more info?
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I wonder....

and P.S. What is your avatar?

I don't need a Sign.....wait......Damn!

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Reply #2 - Dec 4^th, 2011 at 10:09pm

Dave71k Ex Member

FSX_Dude wrote on Dec 4^th, 2011 at 10:04pm:

I wonder....

and P.S. What is your avatar?

It's a guy called Ace Rimmer the time traveling Heroic alter ego of a wimpy guy called Arnold Rimmer from a British cult t.v show called Red Dwarf.
http://www.youtube.com/watch?feature=player_embedded&v=gXYfnWRp1Q0

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Reply #3 - Dec 4^th, 2011 at 10:41pm

RaptorF22 Offline
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I would guess that it's a cooling vent for some engine component, but to know for sure youd have to find the manual or something for the F/A-18E.

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Reply #4 - Dec 4^th, 2011 at 11:51pm

FoxThree Offline
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They provide over-pressure and over-fill relief for the internal tanks, http://www.sludgehornet.com/downloads/NavalAviation_Pubs/F-18EF_NATOPS.pdf (page 76 - 2.2.3 Fuel Tank Pressurization and Vent).

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Reply #5 - Dec 5^th, 2011 at 1:23pm

mfaulisi Offline
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Awesome I was always curious as well

. Thanks for the link!

"For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return." - Leonardo da Vinci

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Reply #6 - Dec 5^th, 2011 at 6:19pm

Dave71k Ex Member

@FoxThree Are you sure that is correct because in that paragraph it says 'The vent lines connect all internal tanks and are ported through the fuselages and vertical tail vent tanks to outlets located on the

side of the vertical tail

.'

The vents I am referring to are on the fuselage.

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Reply #7 - Dec 5^th, 2011 at 6:56pm

FoxThree Offline
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On page 55 it points to the top of fuselage near the base of the tail for the location of the vents.

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Reply #8 - Dec 6^th, 2011 at 9:42am

Dave71k Ex Member

After asking the guys over at the VRS forum they pointed me to this.

They are actually ECS Ducts.

NATOPS
2.13.3.1 ECS Auxiliary Duct Doors. Two ECS auxiliary duct doors are located on the upper surface of the fuselage forward of the base of the vertical tails and immediately in front of the primary and secondary heat exchangers. The ECS auxiliary duct doors are electrically actuated and open into the free stream,closing the main ram air inlets and exposing the auxiliary ram air inlets.

On the ground, the ECS auxiliary duct doors are open with the BLEED AIR knob in any position except OFF. Inflight, the doors are positioned based on Mach number and throttle setting. The doors are always open below Mach 0.33 and are always closedabove Mach 0.40. Between Mach 0.35 and Mach 0.40, the doors are open if either throttle is nearMIL (THAgreater than 25°).

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Reply #9 - Dec 6^th, 2011 at 11:34am

mfaulisi Offline
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Nice work Dave

"For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return." - Leonardo da Vinci

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