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airboeingbus
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A321NEO and A321XLR Structural and System Changes

Tue Jun 16, 2020 5:26 pm

With some range extensions on aircraft I understand that mostly it is just a certification change and not actually a structural and / or system change. Is this the case with the XLR or is there actually physical changes to the air frame?
 
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Polot
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Re: A321NEO and A321XLR Structural and System Changes

Tue Jun 16, 2020 5:54 pm

There are physical changes to the XLR. A new integrated rear center fuel tank is being added, changes to gear and structure to support higher MTOW, and there will be some flap changes.
 
Okcflyer
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Re: A321NEO and A321XLR Structural and System Changes

Tue Jun 16, 2020 5:56 pm

Pretty big change to the flaps, going from double slotted to a new single slot design (apparently different from the single design on the A319/A320)
 
airboeingbus
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Re: A321NEO and A321XLR Structural and System Changes

Tue Jun 16, 2020 8:01 pm

Okcflyer wrote:
Pretty big change to the flaps, going from double slotted to a new single slot design (apparently different from the single design on the A319/A320)

Interesting they went from double to single slotted flaps. I always thought the double slot on the A321 was to increase the lift capability at low speed. Wouldn't that be needed more on the XLR?
 
StTim
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Re: A321NEO and A321XLR Structural and System Changes

Tue Jun 16, 2020 8:05 pm

airboeingbus wrote:
Okcflyer wrote:
Pretty big change to the flaps, going from double slotted to a new single slot design (apparently different from the single design on the A319/A320)

Interesting they went from double to single slotted flaps. I always thought the double slot on the A321 was to increase the lift capability at low speed. Wouldn't that be needed more on the XLR?

It would seem they have been able to engineer a simpler single slot design that actually improves the lift capacity of the old double slotted design.

Things move on.
 
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AECM
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Re: A321NEO and A321XLR Structural and System Changes

Tue Jun 16, 2020 10:28 pm

airboeingbus wrote:
Okcflyer wrote:
Pretty big change to the flaps, going from double slotted to a new single slot design (apparently different from the single design on the A319/A320)

Interesting they went from double to single slotted flaps. I always thought the double slot on the A321 was to increase the lift capability at low speed. Wouldn't that be needed more on the XLR?
The Sharklets and increased engine thrust are the combination that will allow the single slot flap
 
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keesje
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Re: A321NEO and A321XLR Structural and System Changes

Wed Jun 17, 2020 7:24 am

"Our [computational fluid dynamics] capabilities have improved a lot since the 1980s so we've been able to design a single-slotted flap that's as efficient as a double-slotted design and gives a similar kind of performance globally, because it also saves some weight."

He adds: "For take-off especially, we're reducing drag in the second-segment climb."

Another new feature being introduced on the XLR's flap system is the ability to set the surfaces at intermediate positions, depending on operating conditions.

https://www.flightglobal.com/analysis-h ... 41.article

I think you could say the A321LR is an evolutionairy NEO, higher MTOW / strenghtening made possible more range.

The XLR as said is a more radical upgrade, specially the wings and fuel system, combined with a significant MTOW bump.

For airlines that value commonality in terms of maintenance and do not need the 8-9 hour range, the A321LR might be the best option.
Airlines that really want to use it for medium range the XLR offers that, at the cost of commonality and a higher purchase price.

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tealnz
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Re: A321NEO and A321XLR Structural and System Changes

Fri Jun 26, 2020 6:43 am

The big structural challenge has to be the centre rear tank. It involves major change to the pressure vessel from the gear bay back for quite some distance. Coupled with increased MTOW and thrust that suggests some complex engineering. We have yet to see any detail on how it will be done. Looks as if it has been contracted out to Premium Aerotec https://simpleflying.com/airbus-a321xlr-on-track/

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