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A340-600 Inboard Engines Point Down? Why?  
User currently offlineKLAX From , joined Dec 1969, posts, RR:
Posted (11 years 9 months 3 weeks 6 days 22 hours ago) and read 3272 times:

I noticed the other day that the inboard engines on the A340-600 point downwards compared to the outboards. What is the reson behind this?

-Clovis

http://www.airliners.net/addphotos/big/ready/FWWCA34060014R.jpg

8 replies: All unread, jump to last
 
User currently offlineLeezyjet From United Kingdom, joined Oct 2001, 4042 posts, RR: 53
Reply 1, posted (11 years 9 months 3 weeks 6 days 21 hours ago) and read 3233 times:

That link does not work - try again and insert the picture if you can so we can see what you mean.

I work with the A346 just about every day, and to be honest I can't say I've ever noticed, although they do sit pretty low to the ground, I'll have a look next time I'm in ( but not for 2 weeks tho - on holiday now) Big grin

The only reason I can think of based on your description is that aircraft in general fly in a slightly nose up attitude, so then the slight downward angle on the engines would mean that they are able to achieve maximum airflow in the cruise as they would be paralel to the oncoming airflow, which after all is where they spend most of their running time.

Just my thought's.

 Smile



"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"
User currently offlineKlaus From Germany, joined Jul 2001, 21521 posts, RR: 53
Reply 2, posted (11 years 9 months 3 weeks 6 days 20 hours ago) and read 3223 times:

The weird thing is that the outboard and the inboard engines have a different tilt; But as far as I know, it´s indeed due to different airflow at the respective positions.

Just a little strange aesthetically...  Wink/being sarcastic


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Click here for bigger photo!

Photo © Thomas Klein



User currently offlineKLAX From , joined Dec 1969, posts, RR:
Reply 3, posted (11 years 9 months 3 weeks 6 days 19 hours ago) and read 3191 times:

Okay, the picture was accepted right after I posted Big grin


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Photo © Clovis Bouhier



You can really see it there^^

-Clovis


User currently offlineSllevin From United States of America, joined Jan 2002, 3376 posts, RR: 6
Reply 4, posted (11 years 9 months 3 weeks 6 days 16 hours ago) and read 3124 times:

I'd be willing to bet that in flight, as the wingtips flex upwards and the wing "warps" a little, the outboard engines align quite similarly to the inboards, and most favorably into the airflow.

Steve


User currently offlineManzoori From UK - England, joined Sep 2002, 1516 posts, RR: 33
Reply 5, posted (11 years 9 months 3 weeks 5 days 22 hours ago) and read 2977 times:

Steve,

I'd have thought so too but in this shot the inboard engine still looks like it points down compared to the outboard engine


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Click here for bigger photo!

Photo © Sung-Yang Tong



The mystery continues! I'll ask my Airbus colleagues at work on Monday and see if they have any clues.

Cheers!

Rez
 Wink/being sarcastic



Flightlineimages DOT Com Photographer & Web Editor. RR Turbines Specialist
User currently offlineKlaus From Germany, joined Jul 2001, 21521 posts, RR: 53
Reply 6, posted (11 years 9 months 3 weeks 5 days 22 hours ago) and read 2960 times:

The same effect can be seen on other aircraft types as well; In many cases, the engines are canted horizontally rather than vertically. And the only reason I know of is indeed the airflow at the location where the engines are mounted.

There is no benefit to mounting the engines pointing straight forward if the airstream in cruise doesn´t follow the same straight line (due to the "bow wave" created by the fuselage, for instance).

It had been discussed in this thread before:
http://www.airliners.net/discussions/tech_ops/read.main/30558/4/


User currently offlineKLAX From , joined Dec 1969, posts, RR:
Reply 7, posted (11 years 9 months 3 weeks 5 days 21 hours ago) and read 2945 times:

Thanks for the info Klaus. Still a great looking plane...I had some more shots of it accepted today, including a landing Big grin

-Clovis


User currently offlineKlaus From Germany, joined Jul 2001, 21521 posts, RR: 53
Reply 8, posted (11 years 9 months 3 weeks 5 days 20 hours ago) and read 2945 times:

She´s a beauty, indeed! Big grin

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