Why does the Typhoon vent fuel in displays
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 33,064
Received 2,935 Likes
on
1,250 Posts
Now I'm lost.
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 33,064
Received 2,935 Likes
on
1,250 Posts
With you Betty...
Remember don't feed the Hedgehog bread.... Same goes for trolls.
..
Remember don't feed the Hedgehog bread.... Same goes for trolls.
..
Last edited by NutLoose; 23rd Aug 2013 at 21:43.
Join Date: Jan 2003
Location: Leicestershire, England
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
With regard to the original question, yes, the Typhoon does dump fuel during its display. One of the best examples is the 'negative g outside turn' performed during the 2013 display routine (which is the best display yet and utterly spectacular by the way...) The dump vent is above the rudder so there is no mistaking it for vortices coming of other parts of the airframe, hope that helps!
-RP
p.s. I should add its a small amount of fuel vented in the grand scheme of things...
-RP
p.s. I should add its a small amount of fuel vented in the grand scheme of things...
Last edited by Rhino power; 23rd Aug 2013 at 22:08.
Thread Starter
Join Date: Jun 2001
Location: England
Posts: 1,006
Likes: 0
Received 0 Likes
on
0 Posts
Rhino, thanks for the reply. Agree with negative g outside turn being splendid.
Any idea what is happening in the fuel system to make it want to vent. I presume the vent valve is a pressure relief system. I suppose the -ve g just creates the over pressure .. in which case why doesn't it dump all the fuel....
Any idea what is happening in the fuel system to make it want to vent. I presume the vent valve is a pressure relief system. I suppose the -ve g just creates the over pressure .. in which case why doesn't it dump all the fuel....
Join Date: Jan 2001
Location: The Burrow, N53:48:02 W1:48:57, The Tin Tent - EGBS, EGBO
Posts: 2,297
Likes: 0
Received 0 Likes
on
0 Posts
CS, I live in hope of finding one but I fear they became extinct around the time common sense vanished. 
Join Date: Jul 2007
Location: @exRAF_Al
Posts: 3,297
Likes: 0
Received 0 Likes
on
0 Posts
Thanks Rhino. Going off topic for a moment, that must be uncomfortable - what sort of negative G is applied to the pilot during that? Without asking for sensitive info, how much more effective is the gear worn these days (than the few trips I had in a T-4, 20 years ago for instance)?
One of the best examples is the 'negative g outside turn' performed during the 2013 display routine (which is the best display yet and utterly spectacular by the way...)
Join Date: Jan 2003
Location: Leicestershire, England
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ExRAFRadar
Rhino how dare you hijack a thread.
Oh wait, hold on......
Oh wait, hold on......
18greens, i assume the once the pressure in the fuel system is equalized for the negative g element of the display the fuel dump stops, given the short duration i would guess it doesn't take much to in order to do so, just guessing on that though...
AI R, i'm not privvy to any detailed info re the flying kit Typhoon pilots wear (being a civvy) but, i do seem to remember watching an interview with Craig Penrice(?) where he is describing the flying clothing and along with the normal g-suit (on which the zip was fastened by pulling it down rather than up), he also wore g-booties, or, socks if you prefer to provide even greater g protection...
-RP
Join Date: Feb 2007
Location: Exiled in England
Age: 48
Posts: 1,015
Likes: 0
Received 0 Likes
on
0 Posts
Goddamn that's a pretty sight,
Just curious for any sooties still in with comparison of EJ200 vs RB199 experience, better or worse to fix, no hateful module 12 thermocouples to do?
And am I right the 200 has a variable con Di nozzle?
Thrungy and pointy
Just curious for any sooties still in with comparison of EJ200 vs RB199 experience, better or worse to fix, no hateful module 12 thermocouples to do?
And am I right the 200 has a variable con Di nozzle?
Thrungy and pointy
Join Date: Jan 2005
Location: Bouncing around the Holding pattern
Posts: 205
Likes: 0
Received 0 Likes
on
0 Posts
Al R, if I may, the G protection is phenomenal: Full coverage anti g trousers, a natty jacket which does a variety of pressure bits(inflation and breathing), and yes the socks (somewhat gaffed by many) offer the kind of protection against +Gz induced problems that snapping to then sustaining +9G is not really an issue. As with every other type of G protection, there's not a great deal that can be done about -Gz short of a spot of throttling, so we don't tend to bunt all that much.
To answer the original Q, yes the fuel over pressure relief drain can get a bit of fuel pushed up it during -G so we don't tend to bunt all that much.
To answer the original Q, yes the fuel over pressure relief drain can get a bit of fuel pushed up it during -G so we don't tend to bunt all that much.