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engine n°1 pylon? (Read 4824 times)
passeur
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engine n°1 pylon?
Oct 30th, 2011 at 7:47pm
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I never noticed this before but why is the engine n°1 pylon is different from the other pylons ? :


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Kapitan
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Re: engine n°1 pylon?
Reply #1 - Oct 30th, 2011 at 8:00pm
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Never noticed? but thats one of the main features of the 707
What yu mean "pylon" are actually turbocompressors fitted on three of the engines, to provide extra air for cabin pressure, air conditioner and bleed air to engines. The engine nr 1 didnt have a turbocompressor.

Neither any of the 4 engines of the DC8...for example.

The turbocompresor is a main exclusive 707 feature.
  

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passeur
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Re: engine n°1 pylon?
Reply #2 - Oct 30th, 2011 at 8:03pm
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Ok! thank's for the explanation!
  

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Pinatubo
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Re: engine n°1 pylon?
Reply #3 - Oct 30th, 2011 at 11:00pm
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Further reading:

"...The 707s used engine-driven turbocompressors to supply high-pressure air for pressurization. The engines could not supply sufficient bleed air for this purpose without a serious loss of thrust. On many commercial 707s, the outer port (#1) engine mount is distinctly different from the other three, as this is the only engine not fitted with a turbocompressor. With engines 2 through 4 being fitted with TCs, they provide the triple redundancy required of the aircraft's cabin pressurization and air-conditioning system..." See Boeing 707 - Engines
  

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harerton
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Re: engine n�1 pylon?
Reply #4 - Jul 22nd, 2016 at 5:10am
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The 707 built for American Airlines only had 2 turbos!
  

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jeffk19
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Re: engine n�1 pylon?
Reply #5 - Jul 27th, 2016 at 7:40am
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harerton wrote on Jul 22nd, 2016 at 5:10am:
The 707 built for American Airlines only had 2 turbos!



I think that was only the B720, the 707 family had the 3 turbos.

Jeff
  
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Pat Mussotte
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Re: engine n�1 pylon?
Reply #6 - Jan 15th, 2019 at 5:12pm
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Kapitan wrote on Oct 30th, 2011 at 8:00pm:
Never noticed? but thats one of the main features of the 707
What yu mean "pylon" are actually turbocompressors fitted on three of the engines, to provide extra air for cabin pressure, air conditioner and bleed air to engines. The engine nr 1 didnt have a turbocompressor.

Neither any of the 4 engines of the DC8...for example.

The turbocompresor is a main exclusive 707 feature.


For the DC8 that's wrong! It has turbo-compressors(4) located in the front of the fuselage(Did you notice the air intakes in the nose?). The re-engined DC8 have no turbos, they are replaced by two packs! I flew the DC8-55 and 72CF in real life(I'm a former flight engineer)before to fly the DC10.
Cheers
  


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