seat1a
Topic Author
Posts: 495
Joined: Mon Jan 11, 2010 7:52 pm

A350-1000 Rear Fuselage Design Q

Tue Dec 03, 2019 4:12 am

Today on the homepage of Airliners.net is a beautiful A350-1000 in British Airways colors. Great looking airplane IMHO.

When looking at the top of the fuselage in front of the rear tail fin, there's the beginning of a taper in the roof line. Is that correct? For all the experts out there, why is that?

Thanks!
 
tommy1808
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Re: A350-1000 Rear Fuselage Design Q

Tue Dec 03, 2019 4:31 pm

seat1a wrote:
why is that?

Thanks!


Aerodynamics. You need to tamper off the rear to reduce separation drag behind the aircraft. Airbus otter-tails the fuse of to maintain cabin width longer than could be done of the rear tampered of homogeneously on all sides, creating more useable floor space for the same drag/weight.

Best regards
Thomas
This Singature is a safe space......
 
seat1a
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Re: A350-1000 Rear Fuselage Design Q

Tue Dec 03, 2019 7:44 pm

tommy1808 wrote:
seat1a wrote:
why is that?

Thanks!


Aerodynamics. You need to tamper off the rear to reduce separation drag behind the aircraft. Airbus otter-tails the fuse of to maintain cabin width longer than could be done of the rear tampered of homogeneously on all sides, creating more useable floor space for the same drag/weight.

Best regards
Thomas


Thanks, Thomas. What is separation drag? So is the entire rear part of the fuselage tampered to a point? Curious how the increase in usable floor space is increased. Additionally, is there some strengthening in the tampering off to support the rudder?

Much appreciated!
 
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Starlionblue
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Re: A350-1000 Rear Fuselage Design Q

Wed Dec 04, 2019 12:30 am

Airflow has been passing over the fuselage smoothly. If the shape suddenly ends in an edge, you get a lot more drag than with a smooth taper. (Taper, not tamper.)

Image

The otter tail means the fuselage tapers earlier on top and bottom than on the sides. This means you can maintain full seat rows for longer. It also helps that there is a large galley in the aft part. Galleys furnishings are easier to adapt to changes in fuselage width compared to seats.

Yes, of course there is a solid support structure for the fin and stabiliser.

Was this the pic you were referencing?
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
seat1a
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Posts: 495
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Re: A350-1000 Rear Fuselage Design Q

Wed Dec 04, 2019 1:13 am

Thanks for all the information. That's the pic!
 
Max Q
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Re: A350-1000 Rear Fuselage Design Q

Wed Dec 04, 2019 2:09 am

This is where the good looks of the A350 go all wrong

Aerodynamics aside, and the minuscule vertical tail looks totally out of proportion and far too small for the aircraft
The best contribution to safety is a competent Pilot.


Guns are a malignant cancer that are destroying our society
 
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Starlionblue
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Re: A350-1000 Rear Fuselage Design Q

Wed Dec 04, 2019 4:47 am

Max Q wrote:
This is where the good looks of the A350 go all wrong

Aerodynamics aside, and the minuscule vertical tail looks totally out of proportion and far too small for the aircraft


Eye of the beholder and all that.

And it isn't very minuscule when you stand under it. :D
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
tommy1808
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Joined: Thu Nov 21, 2013 3:24 pm

Re: A350-1000 Rear Fuselage Design Q

Wed Dec 04, 2019 5:27 am

Starlionblue wrote:
(Taper, not tamper.)


now there is some memory that needs updating. Thanks.

Best regards
Thomas
This Singature is a safe space......
 
LH707330
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Joined: Fri Jun 15, 2012 11:27 pm

Re: A350-1000 Rear Fuselage Design Q

Wed Dec 04, 2019 6:38 pm

Starlionblue wrote:
Max Q wrote:
This is where the good looks of the A350 go all wrong

Aerodynamics aside, and the minuscule vertical tail looks totally out of proportion and far too small for the aircraft


Eye of the beholder and all that.

And it isn't very minuscule when you stand under it. :D

I've always thought that it's the relative lack of chord taper on the fin that makes it look ugly, same as the 380. The older A fins and most B fins, except the 777, look much better to me.
 
JayinKitsap
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Re: A350-1000 Rear Fuselage Design Q

Thu Dec 05, 2019 5:04 am

Starlionblue wrote:
Airflow has been passing over the fuselage smoothly. If the shape suddenly ends in an edge, you get a lot more drag than with a smooth taper. (Taper, not tamper.)

Image

The otter tail means the fuselage tapers earlier on top and bottom than on the sides. This means you can maintain full seat rows for longer. It also helps that there is a large galley in the aft part. Galleys furnishings are easier to adapt to changes in fuselage width compared to seats.

Yes, of course there is a solid support structure for the fin and stabiliser.

Was this the pic you were referencing?


The portion of the hull that begins to taper needs to transition smoothly between the typical area and the area of the tail. I recall the 744 lengthened the upper deck from the 742 as it smoothed the areas coming into the wings. Similarly, a lot of wing roots have higher sweep than the wing.
 
Max Q
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Joined: Wed May 09, 2001 12:40 pm

Re: A350-1000 Rear Fuselage Design Q

Thu Dec 05, 2019 9:33 am

LH707330 wrote:
Starlionblue wrote:
Max Q wrote:
This is where the good looks of the A350 go all wrong

Aerodynamics aside, and the minuscule vertical tail looks totally out of proportion and far too small for the aircraft


Eye of the beholder and all that.

And it isn't very minuscule when you stand under it. :D

I've always thought that it's the relative lack of chord taper on the fin that makes it look ugly, same as the 380. The older A fins and most B fins, except the 777, look much better to me.



Agreed

The 777 fin looks too small as well
The best contribution to safety is a competent Pilot.


Guns are a malignant cancer that are destroying our society

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