Author Topic: Another Question - Jet Pipes  (Read 6592 times)

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Offline djrose007

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Another Question - Jet Pipes
« on: February 02, 2012, 09:30:40 PM »
When I was at Fairford we had a load of EADS Executives visiting XH558 on the stand near to the Village.
One of them asked me why the outer jet exhaust is at an angle to the to the inner exhaust pipe.
There weren't any engineering types around at the time and I didn't get a convincing answer.

Anyone tell me the answer to this one?

Thanks very much
David Rose
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Offline Sarah Favell

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Re: Another Question - Jet Pipes
« Reply #1 on: February 02, 2012, 09:42:34 PM »
Where's Denis when you need him....I heard him answer this question numerous times when we did hangar tours with him and I'll be b******* if I can remember the answer.......sorry.  :(
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Offline deeleyt

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Re: Another Question - Jet Pipes
« Reply #2 on: February 03, 2012, 12:12:15 AM »
The inboard nozels are deflected downwards slightly and the outboard pointed slight outboard and downwards to reduce the variation in longitudinal and trim with engine thrust. It also reduced the yaw from the outboard engines so it was virtualy the same as an inboard engine, as the thrust was applied further out from the CofG, and also allowing for a smaller tailplane area.

Can't belive I remembered that  :o

4 to 5 degrees I seem to remember.
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Offline johnri

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Re: Another Question - Jet Pipes
« Reply #3 on: February 03, 2012, 08:48:39 AM »
Tailplane ???????????    Tail fin possibly.
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Offline smiler

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Re: Another Question - Jet Pipes
« Reply #4 on: February 03, 2012, 09:35:35 AM »
Also now you can see the length of the jet pipes it should answer the question of reheat, as this is achieved by injecting, then igniting fuel in the exhaust of the engine (there wouldn't be much left of the wing!!).

 :D
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Offline speedy

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Re: Another Question - Jet Pipes
« Reply #5 on: February 03, 2012, 09:57:35 AM »
However, didn't the Mk6, Type 6, Phase 6 or whatever they were going to call the super-Vulcan thingy sized for SIX Skybolts (plus a big plug in the forward fuselage to hold a second crew) have a reheated version of the 301 planned?  Would have taken some interesting engineering!  I guess they'd have put the engines much further aft in the wings, but wouldn't having a very long intake have implications for the engines, never mind the CoG?
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Offline djrose007

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Re: Another Question - Jet Pipes
« Reply #6 on: February 03, 2012, 08:16:38 PM »
Quote from: "deeleyt"
The inboard nozels are deflected downwards slightly and the outboard pointed slight outboard and downwards to reduce the variation in longitudinal and trim with engine thrust. It also reduced the yaw from the outboard engines so it was virtualy the same as an inboard engine, as the thrust was applied further out from the CofG, and also allowing for a smaller tailplane area.

Can't belive I remembered that  :o

4 to 5 degrees I seem to remember.

That's amazing, thanks Deeleyt. I wish I could remember the name of the EADS Big Cheese that asked the question! he was accompanied by a young lady, also EADS and they were very interested in the reason for this. I'll look out for them this display season, hoping that we'll make it in light of todays announcement! Fingers crossed but thrust deep into pockets!
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Offline Sad Sam

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Re: Another Question - Jet Pipes
« Reply #7 on: February 03, 2012, 11:56:47 PM »
Quote from: "speedy"
However, didn't the Mk6, Type 6, Phase 6 or whatever they were going to call the super-Vulcan thingy sized for SIX Skybolts (plus a big plug in the forward fuselage to hold a second crew) have a reheated version of the 301 planned?  Would have taken some interesting engineering!  I guess they'd have put the engines much further aft in the wings, but wouldn't having a very long intake have implications for the engines, never mind the CoG?

Hi Nick,

The B3 would have had a development of the Olympus which drove a fan in the jet pipe via a shaft (there was to be what amounted to an auxilary intake in the top and bottom surfaces of the wing just aft of the rear spar)  A sort of reverse of the modern ducted fan with the engine in front of the fan.  Would have been an incredible bit of kit.
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