SK A340
Topic Author
Posts: 829
Joined: Thu Mar 09, 2000 2:44 am

Is The A340 Leaning Forward?

Fri Aug 24, 2001 5:37 pm


When you see a picture of an A340 on the ground, it looks like it's leaning forward. Is it really doing that, and if so how is it in the cabin? Do you feel it?



Click for large version
Click here for full size photo!

Photo © Scandpix


 
User avatar
Luxair
Posts: 836
Joined: Tue Jan 30, 2001 12:17 am

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 6:15 pm

I agree with you because everytime when I see a picture of the A340-300 I
have the same impression as you have . I flew with Sabena's A340-300 last year
from Brussel to New York and you can not feel or see it inside the cabin but however
I wonder why it looks like leaning forward too?

Best regards
 
NoUFO
Posts: 7397
Joined: Tue Apr 17, 2001 7:40 am

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 6:26 pm

Maybe it is so, because a short front gear is more robust?
Or maybe pilots have a better view over the airfield?
Maybe both?

NoUFO
I support the right to arm bears
 
Klaus
Posts: 20578
Joined: Wed Jul 11, 2001 7:41 am

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 7:05 pm

I remember a TV program several years ago about development and flight testing of the 340; They mentioned some problems with a cargo loader due to the slightly angled cargo door.

I´m just still wondering what they did that for??
 
zauberfloete
Posts: 297
Joined: Mon Nov 20, 2000 7:07 am

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 8:56 pm

I heard it was due to the construction of the front gear.
This front gear strut was an easy an practical design, for various reasons. But it is a little bit too short.
(so that lean forward design is an unwanted effect, but it´s not a big problem)
I think the new versions (500, 600) have a complete new develloped gear, and they don´t show that effect.
 
zauberfloete
Posts: 297
Joined: Mon Nov 20, 2000 7:07 am

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 9:00 pm

I have to correct myself - I looked a t pictures of the 340-600, and it is still a little bit leaning forward.
 
Guest

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 9:02 pm

I used to fly for Virgin, the pilots there said it was because they used an A300/A310 nose gear to cut development costs.
 
747-600X
Posts: 2492
Joined: Wed Jan 05, 2000 3:11 am

RE: Is The A340 Leaning Forward?

Fri Aug 24, 2001 9:06 pm

First, this is not just A340s which do this. Take a look at a profile schematic of a 767-400 - you'll notice that the ground is shown slanted. For that matter, look at almost any modern jet's schematic, the side view will show one of two things - either the ground is slanted so that the schematic can show a level fuselage, or the front nose gear is shown raised off the ground for the same reason, either way, on most modern jets the aircraft dose lean forward. This way the front gear can be shorter so it takes up less space when it is stowed, though I'm not sure what's so valuable about the space under the nose, and this allows the plane to rotate further on the runway... an additional degree of forward rotation is an additional degree of rotation. Anyway, it's not just on the A340. Lots of aircraft have this design.
 
9V-SPJ
Posts: 667
Joined: Thu Dec 21, 2000 1:51 pm

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 12:41 am

I have heard that under a full fuel load, the A340 tends to bend on its nose gear a bit.

9V-SPJ
 
757man
Posts: 355
Joined: Sun Feb 11, 2001 6:59 am

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 1:57 am

If we're talking about shorter nose gear legs, then why don't you also mention the 737, especially the early -200 series.
 
Klaus
Posts: 20578
Joined: Wed Jul 11, 2001 7:41 am

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 9:12 am

Hmmm... Maybe it´s indeed a good idea:

The nose gear doesn´t need to be as tall as the MLG, since it doesn´t contribute to tail clearance on rotation or to engine ground clearance on crosswind landings.

Maybe it´s not so much the space for the wheel well but instead the weight of the entire nose gear assembly that´s making a difference...
 
sharpnfuzzy
Posts: 557
Joined: Fri Jun 22, 2001 2:24 pm

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 11:54 am

Hey you're right.... I just noticed that the 767-400 looks like it is leaning forward

Click for large version
Click here for full size photo!

Photo © Marlo Plate



I never noticed it before.. probably cause i never gave it a second though, due to the fact that the 300/200s aren't leaning.

Click for large version
Click here for full size photo!

Photo © David Knudsen



I guess it's just more noticable on the 340.

snf
 
BA
Posts: 10133
Joined: Fri May 19, 2000 11:06 am

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 12:37 pm

Oh boy......the CRJ-700 is the best example of shorter nose gear. If I can find a photo, I'll post it.

The CRJ-700 REALLY leans forward.

Regards.
"Generosity is giving more than you can, and pride is taking less than you need." - Khalil Gibran
 
747-600X
Posts: 2492
Joined: Wed Jan 05, 2000 3:11 am

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 12:51 pm

One more thing, with the nose leaning forward the pilot has increased visibility of the ground in front of his plane, and the idea that it's for weight saving is probably right, with planes it's all weight weight weight!
 
VC-10
Posts: 3546
Joined: Tue Oct 26, 1999 11:34 am

Now Here's A Funny Story

Sat Aug 25, 2001 12:52 pm

When they were designing the A340 someone forgot to tell the fuel system designers that the a/c was going to sit on the ground with a nose down attitude. The fuel system people thought it would be horizontal so put the fuel tank water drain points at the lowest points in each tank.

Now with the a/c sitting nose down the fuel tank low points are further forward than the water drain valves. This meant that when the weekly fuel tank water drain was carried out not all the water was removed from the tanks resulting in problems with the fuel qty indication system. When the problem was fully appreciated, until mods were carried out, the procedure was that the a/c had to be jacked horizontal before a proper water drain could be carried out.
 
AerLingus
Posts: 2280
Joined: Wed Mar 08, 2000 9:22 am

RE: Is The A340 Leaning Forward?

Sat Aug 25, 2001 3:06 pm

The MD-80 leans forward quite a bit, but you don't really notice it from inside the cabin. I imagine the inability to notice it would be the same for Airbus jets as well.
Get your patchouli stink outta my store!
 
DeanBNE
Posts: 246
Joined: Tue Jan 26, 2016 12:47 pm

RE: Is The A340 Leaning Forward?

Sun Aug 26, 2001 11:12 pm

I, too, have often wondered why aircraft, seemingly the A340 in particular, lean forward and I have a *theory* as to why...
Apart from improved surface visability, I also think that it improves the aircraft's runway performance. Most large, modern jetliners aircraft have their wings set at an an angle of incidence of about 3 (!?!) degrees. By having a slight nose down attitude this then negates the angle of incidence, which I believe during take-off, reduces the drag of the wing there-by allowing for a short take-off roll.
Any thoughts?

Cheers
DeanBNE
 
VS11
Posts: 876
Joined: Mon Jul 02, 2001 6:34 am

RE: Is The A340 Leaning Forward?

Sun Aug 26, 2001 11:40 pm

Sorry to digress from the topic.

BASteward -
why on earth did you leave Virgin to work for BA?

Regards
 
eg777er
Posts: 1782
Joined: Fri Feb 04, 2000 11:11 pm

RE: Is The A340 Leaning Forward?

Mon Aug 27, 2001 1:38 am

I think it's something to do with the fact that the gear compressed more under loading than Airbus originally anticipated.

This caused some problems with LH I think as they couldn't get airstairs that were tall enough to reach door 4 on thier 340s.

The 777 also leans forward.
 
toady
Posts: 700
Joined: Sun Feb 11, 2001 2:36 am

RE: Is The A340 Leaning Forward?

Mon Aug 27, 2001 2:06 am

These 2 also have a slight lean forward:


Click for large version
Click here for full size photo!

Photo © Paul Robinson




Click for large version
Click here for full size photo!

Photo © Glenn Alderton

 
Red Panda
Posts: 1433
Joined: Wed Jun 14, 2000 12:58 pm

RE: Is The A340 Leaning Forward?

Mon Aug 27, 2001 4:39 am

First maybe the well is not big enough for long nose gear.


and I think DeanBNE has a pretty good pt. there-increase rwy performance.

brgds // r panda
 
User avatar
Bruce
Posts: 4934
Joined: Tue May 18, 1999 2:46 am

RE: Is The A340 Leaning Forward?

Mon Aug 27, 2001 5:04 am

The 727 also looks lower in the front.
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens

Who is online