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VSMUT
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Re: Telling the 321LR and 757 apart

Thu Jun 01, 2017 8:09 pm

The obvious part is that the 757 has an odd fuselage, with 2 different fuselage diameters ahead and aft of the wings. The A321 however has a correct, normal fuselage.
 
ChrisKen
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Re: Telling the 321LR and 757 apart

Thu Jun 01, 2017 8:23 pm

VSMUT wrote:
The obvious part is that the 757 has an odd fuselage, with 2 different fuselage diameters ahead and aft of the wings. The A321 however has a correct, normal fuselage.


Say what? I assume you meant Fuselage length fore and aft of the wing. More pronounced difference on 753.

2x Four Wheel main gear v 2x Two Wheel Main Gear
"V" Shaped Cockpit Side window profile v Horizontal Cockpit Window Side Profile (Plus notched Top Rear corner)
 
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cougar15
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Re: Telling the 321LR and 757 apart

Thu Jun 01, 2017 8:29 pm

what an awfull thread! What has Avnut become to warrant 50 replies to this.........?
 
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shamrock350
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Re: Telling the 321LR and 757 apart

Thu Jun 01, 2017 8:39 pm

Any regular spotter or avgeek should be able to tell them apart quite easily but explaining the differences to your average joe would be a bit more difficult.

Inflight, the nose and tail always give it away for me, the A321 has that distinctive rounder nose and a much smaller tail. On the ground it would be taller gear of the 757 and the engine differences along with the future door configurations.
 
global2
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Re: Telling the 321LR and 757 apart

Fri Jun 02, 2017 12:12 am

God, it was much more fun trying to tell the difference between a 707 and a DC-8, or a DC-10 vs. L-1011!
 
VSMUT
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Re: Telling the 321LR and 757 apart

Fri Jun 02, 2017 8:20 pm

ChrisKen wrote:
VSMUT wrote:
The obvious part is that the 757 has an odd fuselage, with 2 different fuselage diameters ahead and aft of the wings. The A321 however has a correct, normal fuselage.


Say what? I assume you meant Fuselage length fore and aft of the wing. More pronounced difference on 753.


It's true, look closely at a side view of the 757 (any variant). The diameter of the fuselage is different fore and aft of the wing.
 
ChrisKen
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Re: Telling the 321LR and 757 apart

Fri Jun 02, 2017 8:40 pm

757 fuselage is 12 ft 6 in (3.75 m) in diameter throughout. As is the 737's.
I'll grant you that the rear section may look slightly larger from side on but I'd wager it's nothing more than an optical effect (or confusion) caused by the wing box and/or fairings.
 
Mangs
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Re: Telling the 321LR and 757 apart

Fri Jun 02, 2017 9:34 pm

Well, its not a perfect circle.

The 737 and I guess the 757 have an odd shaped fuselage.

At the height of the cabin floor there is a "notch/sucked in" in the lack of better word.

Its like it's 2 different diameter half tubes joined together, see pictures:

https://readtiger.com/img/wkp/en/Boeing_737_fuselage_train_hull_3473.jpg

http://farm1.static.flickr.com/1/1287284_99081f70b7.jpg

It's hard to notice it from afar but when you get close to it during a walk around for example its very clear.
 
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FredrikHAD
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Re: Telling the 321LR and 757 apart

Fri Jun 02, 2017 10:24 pm

The tell-tale for me has always been the top of the fuselage just under the tail fin. All Airbuses up to and including A340 have a very straight line whereas all Boeings except the 707/720 and 747 have a more or less pronounced drop towards the tail, even the 717. Only A350 and A380 have this drop in the Airbus family and the 737 has a slightly less pronounced drop than the rest of the Boeings.

A321, top of fuselage is straight all the way back behind the tail fin.


Boeing 757, fuselage bends down starting at the tail fin and is significantly lower by the APU exhaust.


/Fredrik
 
jeffrey0032j
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 6:54 am

If you see a narrowbody plane that looks elegant, and has the right shape, thats a beauty called the 757.
 
StTim
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 8:00 am

757 twin axle bogey, 321 single axle bogey!
 
rbavfan
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 8:13 am

jaybird wrote:
iahcsr wrote:
One dead giveaway 321/757 is both the cockpit windows and doors. The differences are quite apparent.. To most of us here I dare say :eyepopping: :scratchchin:


Agreed .. on the 757 there's a definate drop on the cockpit windows (not sure how to phrase it) - and then there's that nose .. :-)


Thats because to use the 767 cockpit they had to do a step-down into the cockpit to make it fit.
 
rbavfan
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 8:25 am

VSMUT wrote:
The obvious part is that the 757 has an odd fuselage, with 2 different fuselage diameters ahead and aft of the wings. The A321 however has a correct, normal fuselage.


I never noticed before that the lower cargo hold aft of the wing is closer to the ground.
 
rbavfan
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 8:28 am

ChrisKen wrote:
757 fuselage is 12 ft 6 in (3.75 m) in diameter throughout. As is the 737's.
I'll grant you that the rear section may look slightly larger from side on but I'd wager it's nothing more than an optical effect (or confusion) caused by the wing box and/or fairings.


Width wise yes. But top of fuselage to bottom of fuselage the rear section is taller than the fwd section.
Take any side photo of the 757. Copy a section of the aft fuselage from top edge to bottom edge. Move it fwd to to the nose section. it's different.
 
Virtual737
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 8:49 am

Nose is all I need to look at. As mentioned before, the ugly (IMHO) 'SIM' shaped rear cockpit windows, far more triangular 2nd cockpit windows and more dolphin like nose make the A32x family (and most other) Airbii distinctive.
 
WIederling
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 9:17 am

cloudboy wrote:
OP here. The ultimate question - you are trying to tell someone who is not an aviation nut how to tell the two part. I guess this extends to all 321s in a sense - how to tell the two apart if they are just looking at the aircraft. For instance, the above photo, to someone who does not know what flaps or winglets are, how would you tell them to tell them apart?


Take the old Animal Farm adage: "4 legs good 2 legs bad" :-)

i.e. 757 4 wheel bogie, A321 2 wheel gear leg.

The A321 has a fatter tail than the 757.
The A321 vertical stab has less sweep than the 757.
 
pugman211
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 10:00 am

Looking at the MLG is probably the easiest way to distinguish the two aircraft on the ground. Other cues will be the wingtip, the flaps, and the tail.

What about if you are looking at the aircraft head on??? For Me, it's the landing lights. All A320 family aircraft have the gear lights below the wing. The 757 and 737 and probably most Boeing's have the gear lights in the centre line if the wing root. (The Kruger box??)
 
parapente
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Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 11:16 am

One uses 30% less fuel for the same mission?
 
VSMUT
Posts: 5497
Joined: Mon Aug 08, 2016 11:40 am

Re: Telling the 321LR and 757 apart

Sat Jun 03, 2017 12:40 pm

ChrisKen wrote:
757 fuselage is 12 ft 6 in (3.75 m) in diameter throughout. As is the 737's.
I'll grant you that the rear section may look slightly larger from side on but I'd wager it's nothing more than an optical effect (or confusion) caused by the wing box and/or fairings.


It's not an optical effect. This drawing from another forum illustrates it:

Image

In the link below it is also confirmed by a former Boeing engineer who didn't believe it either until he took at look at some technical documents:

http://www.diecastaircraftforum.com/gen ... wings.html

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