Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

A320neo Rotation

Tech Log The very best in practical technical discussion on the web

A320neo Rotation

Old 31st May 2019, 03:54
  #21 (permalink)  
 
Join Date: Apr 2006
Location: Asia
Age: 49
Posts: 524
Likes: 0
Received 0 Likes on 0 Posts
the flare on the 321 NEO feels mushy causing a prolonged flare but i cant find anything on the books.
maybe thats why they keep quiet with boeing related matters.
MD83FO is offline  
Old 31st May 2019, 11:49
  #22 (permalink)  
 
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,403
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by MD83FO
the flare on the 321 NEO feels mushy causing a prolonged flare but i cant find anything on the books.
maybe thats why they keep quiet with boeing related matters.
It's not neo but all sharklet aircraft are slippery in flare because of drag reduction. Because of that SAFETY FIRST states that for GS mini only 1/3 of ∆ wind is used unlike non sharklets aircraft which use full ∆wind.
vilas is offline  
Old 31st May 2019, 12:18
  #23 (permalink)  
 
Join Date: Mar 2012
Location: Having a margarita on the beach
Posts: 2,419
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by vilas
It's not neo but all sharklet aircraft are slippery in flare because of drag reduction. Because of that SAFETY FIRST states that for GS mini only 1/3 of ∆ wind is used unlike non sharklets aircraft which use full ∆wind.
Are You sure about that ? Safety first #24 only discusses CEO vs NEO difference in the k factor.
sonicbum is offline  
Old 31st May 2019, 13:52
  #24 (permalink)  
 
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,403
Likes: 0
Received 0 Likes on 0 Posts
Sonic check this one
https://safetyfirst.airbus.com/contr...h-and-landing/
vilas is offline  
Old 31st May 2019, 14:07
  #25 (permalink)  
 
Join Date: Mar 2006
Location: USA
Posts: 2,513
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by vilas
That article doesn't mention sharklets, or did I miss something? Always more to know about this plane.

As an aside, I like the way they put it. "Stronger deceleration capability". Is that the PC way of saying underpowered?
Check Airman is offline  
Old 31st May 2019, 17:24
  #26 (permalink)  
 
Join Date: Jul 2006
Location: Somewhere over the rainbow
Posts: 946
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Check Airman
That article doesn't mention sharklets, or did I miss something? Always more to know about this plane.

As an aside, I like the way they put it. "Stronger deceleration capability". Is that the PC way of saying underpowered?
Interesting. I assume they are talking about the CEO without sharklets; Otherwise I don’t undestand how it’s possible. I don’t see how a NEO with engines of 81 inches diameter can not have a stronger deceleration. Lol

Last edited by pineteam; 1st Jun 2019 at 01:38.
pineteam is offline  
Old 1st Jun 2019, 08:46
  #27 (permalink)  
 
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,403
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Check Airman
That article doesn't mention sharklets, or did I miss something? Always more to know about this plane.

As an aside, I like the way they put it. "Stronger deceleration capability". Is that the PC way of saying underpowered?
May be I mistook it as Sharklets in place of Neo. It says neo. But the effect is due to sharklets.
vilas is offline  
Old 1st Jun 2019, 09:58
  #28 (permalink)  
 
Join Date: Mar 2012
Location: Having a margarita on the beach
Posts: 2,419
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by vilas
Hi vilas,

thanks, that's the one I was referring to. The k factor of .33 is applicable to the NEO but I can't see any reference to the CEOs with sharklets... unless I am missing something ?

Cheers.
sonicbum is offline  
Old 1st Jun 2019, 11:21
  #29 (permalink)  
 
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,403
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by sonicbum
Hi vilas,

thanks, that's the one I was referring to. The k factor of .33 is applicable to the NEO but I can't see any reference to the CEOs with sharklets... unless I am missing something ?

Cheers.
I misread it. It says Neo. But the effect is due to sharklets. As PT says higher fan diameter should offer more drag.
vilas is offline  
Old 1st Jun 2019, 11:45
  #30 (permalink)  
 
Join Date: Mar 2012
Location: Having a margarita on the beach
Posts: 2,419
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by vilas
I misread it. It says Neo. But the effect is due to sharklets. As PT says higher fan diameter should offer more drag.
Makes sense, thanks.
sonicbum is offline  
Old 1st Jun 2019, 13:10
  #31 (permalink)  

Only half a speed-brake
 
Join Date: Apr 2003
Location: Commuting not home
Age: 46
Posts: 4,319
Received 3 Likes on 3 Posts
Airbus usually do not make that kind of mistakes in official documents. Writing NEO but meaning Sharklets, missing the hint there are probably more CEOs with sharklets than NEOs produced altogether.

Though I do agree with the sentiments above, I think we should not settle for a "typo" type explanation.
FlightDetent is offline  
Old 1st Jun 2019, 14:52
  #32 (permalink)  
 
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,403
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by FlightDetent
Airbus usually do not make that kind of mistakes in official documents. Writing NEO but meaning Sharklets, missing the hint there are probably more CEOs with sharklets than NEOs produced altogether.

Though I do agree with the sentiments above, I think we should not settle for a "typo" type explanation.
Somebody needs to ask Airbus on tech request.
vilas is offline  
Old 1st Jun 2019, 15:04
  #33 (permalink)  
 
Join Date: Mar 2012
Location: Having a margarita on the beach
Posts: 2,419
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by FlightDetent
Airbus usually do not make that kind of mistakes in official documents. Writing NEO but meaning Sharklets, missing the hint there are probably more CEOs with sharklets than NEOs produced altogether.

Though I do agree with the sentiments above, I think we should not settle for a "typo" type explanation.
Very true indeed. We do not operate NEOs but we do operate lots of sharklets CEOs and the related MSN FCOM has the same GS mini logic as the winglets ones. I guess it’s time to give our technical pilot a bit of work 😁
sonicbum is offline  
Old 1st Jun 2019, 15:45
  #34 (permalink)  

Only half a speed-brake
 
Join Date: Apr 2003
Location: Commuting not home
Age: 46
Posts: 4,319
Received 3 Likes on 3 Posts
It is in the article, understanding it becomes the hard part. With 6 landings on NEO combined, I am not qualified to draw opinions.
FlightDetent is offline  
Old 1st Jun 2019, 16:05
  #35 (permalink)  
 
Join Date: Jul 2006
Location: Somewhere over the rainbow
Posts: 946
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by sonicbum


Very true indeed. We do not operate NEOs but we do operate lots of sharklets CEOs and the related MSN FCOM has the same GS mini logic as the winglets ones. I guess it’s time to give our technical pilot a bit of work ��
I just checked my FCOM: For the CEO with wingtips fences and sharklets the GS logic is the same and for the NEO the GS logic is 1/3... Exactly as described in that Airbus magazine... Weird. I hope we can get an answer soon. =)
pineteam is offline  
Old 1st Jun 2019, 17:32
  #36 (permalink)  
 
Join Date: May 2002
Location: Sale
Posts: 374
Likes: 0
Received 0 Likes on 0 Posts
Regarding the original posters question.

On the NEO, I don't notice any difference in the initial pitch up from the runway. However, approaching the initial climb pitch attitude, the required pull back on the stick is much less. This gives a tendency to overpitch if you don't anticipate it.

Not really noticed any difference on landing.
Field In Sight is offline  
Old 1st Jun 2019, 19:00
  #37 (permalink)  
 
Join Date: Mar 2006
Location: USA
Posts: 2,513
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Field In Sight
Regarding the original posters question.

On the NEO, I don't notice any difference in the initial pitch up from the runway. However, approaching the initial climb pitch attitude, the required pull back on the stick is much less. This gives a tendency to overpitch if you don't anticipate it.
So you're saying they modified it to fly more like the sim?
Check Airman is offline  
Old 1st Jun 2019, 19:06
  #38 (permalink)  
 
Join Date: Apr 2004
Location: United States of Europe
Age: 40
Posts: 502
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by pineteam


I just checked my FCOM: For the CEO with wingtips fences and sharklets the GS logic is the same and for the NEO the GS logic is 1/3... Exactly as described in that Airbus magazine... Weird. I hope we can get an answer soon. =)
Higher residual thrust at idle on the NEO? Only flew it once.
OPEN DES is online now  
Old 2nd Jun 2019, 00:15
  #39 (permalink)  
 
Join Date: Jul 2006
Location: Somewhere over the rainbow
Posts: 946
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by OPEN DES


Higher residual thrust at idle on the NEO? Only flew it once.
Hi OPEN DES,

Only flew it once also haha. So can not really say. But that could be it.
pineteam is offline  
Old 2nd Jun 2019, 05:39
  #40 (permalink)  
 
Join Date: Jun 2007
Location: Wanderlust
Posts: 3,403
Likes: 0
Received 0 Likes on 0 Posts
There are different angles at work. One is the sharklets. However subtle it should make some difference during flare and touchdown from winglets. It did to 747-400 from classic, the 737 guys may opine about the 737-300 and NG. The other is engines.Between the CFM and IAE engines Ceo aircraft the IAE has more thrust at lower levels while CFM has higher thrust at higher levels. This is born out by OEI ceilings which are noticeably higher for CFM. That includes residual thrust. I know of one Airline where they find hard landing occurrences are much higher on the Neo with CFM but they are comparing with their CEOs which have IAE. The Neos have higher fan diameter and higher weight and they feel it tends to drop when thrust is closed. And yet according to Airbus the Neo deceleration is less as compared to CEO. So the correct answer can only come from the Airbus. Can someone get it?
vilas is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.