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Engine exhausts on an Avro Vulcan

As you can see above, there are two small pipes next to the main engine exhausts on this Avro Vulcan(the one at Duxford). I'm curious what these pipes are/what they are for. Are they fuel dump pipes? If so why have two right next to each other?

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Although it is difficult to say from old photos, the tubes doesn't seem to be visible on the prototype or early Vulcans.

Another Vulcan, XH558 started life as a B2 and are fitted with Olympus 202 engines. Looking at a photo of it there are what appear to be intakes on each engine, as seen here. I don't know what engines the Duxford Vulcan has, but according to Wikipedia the 202 was the definitive version for the Vulcan, with the exception of some aircraft which received the 301. As far as I can tell, one of the features with the 202 was that it had a redesigned oil separator breathing system.

Such features require air inlet as well as an outlet for the vented gases, could this be related to that system?

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    $\begingroup$ This give great clues but does not answer the question "what are they?" $\endgroup$ – Manu H Mar 18 at 19:19
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Well, they're not for fuel dumping or for drag chutes. That much at least is ruled out by the 156-element cutaway diagram on pp. 183-186 of P.D. Stemp's "Kites, birds and stuff: Avro Aircraft."

A similar diagram of one of the B.2's Olympus 301 engines might conclusively name these pipes. This photo from Grace's Guide reveals some peripheral pipes that might give a clue. enter image description here

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    $\begingroup$ ... or not. The pipes in the picture terminate at the section after the turbine. There is nothing there that gives a clue as to what the pipes in question are. $\endgroup$ – Jpe61 Mar 15 at 21:36
  • $\begingroup$ It answers the question "what are they not?" but not the actual question "what are they?" $\endgroup$ – Manu H Mar 18 at 19:18
  • $\begingroup$ At this point we're all grasping at clues. Maybe someone has a not-online book on their shelf... $\endgroup$ – Camille Goudeseune Mar 18 at 19:27
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The two thin pipes next to the inner exhaust ports are indeed fuel dumping pipes. the Drogue chute is mounted in the rear of the fuselage directly below the rudder.

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    $\begingroup$ Welcome to the site. Any supporting material would be appreciated. You can use the edit button to add information. $\endgroup$ – ymb1 Mar 15 at 10:53
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    $\begingroup$ In the image is a B.2. Only K.2 could jettison fuel, and fuel jettison isn't really per engine (so there's no need for 2 pipes per side). $\endgroup$ – ymb1 Mar 15 at 15:59

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