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707 Captain >> 707 Captain >> engine n�1 pylon? https://www.captainsim.org/forum/csf.pl?num=1320004035 Message started by passeur on Oct 30^th, 2011 at 7:47pm

Title: engine n�1 pylon?
Post by passeur on Oct 30^th, 2011 at 7:47pm

I never noticed this before but why is the engine n�1 pylon is different from the other pylons ? :
http://img824.imageshack.us/img824/1443/questionpylons.jpg

Uploaded with ImageShack.us

Title: Re: engine n�1 pylon?
Post by Kapitan on Oct 30^th, 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.

Title: Re: engine n�1 pylon?
Post by passeur on Oct 30^th, 2011 at 8:03pm

Ok! thank's for the explanation!

Title: Re: engine n�1 pylon?
Post by Pinatubo on Oct 30^th, 2011 at 11:00pm

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

Title: Re: engine n�1 pylon?
Post by harerton on Jul 22^nd, 2016 at 5:10am

The 707 built for American Airlines only had 2 turbos!

Title: Re: engine n�1 pylon?
Post by jeffk19 on Jul 27^th, 2016 at 7:40am

harerton wrote on Jul 22^nd, 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

Title: Re: engine n�1 pylon?
Post by Pat Mussotte on Jan 15^th, 2019 at 5:12pm

Kapitan wrote on Oct 30^th, 2011 at 8:00pm:

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