Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Shorter Vertical Stabilizer For The A380-900?  
User currently offlinea380900 From France, joined Dec 2003, 1116 posts, RR: 1
Posted (2 years 8 months 3 weeks 4 days 8 hours ago) and read 6766 times:

Depending on its length (80m? 88m?), do you have an idea of how much shorter the vertical stabilizer of the A380-900 would need to be? And its horizontal stabilizer? How much weight could be gained?

6 replies: All unread, jump to last
 
User currently onlineprebennorholm From Denmark, joined Mar 2000, 6480 posts, RR: 54
Reply 1, posted (2 years 8 months 3 weeks 3 days 22 hours ago) and read 6549 times:

Not much.

The -900, if it ever is built, is likely to utilize the heavier MTOW and more powerful engines which were planned for the cargo version.

It will still have to deal with the even more massive asymmetric thrust of an outer engine shut down after V1 speed. That will demand even more rudder authority than the -800. The longer moment arm comes in handy.

My guess would be that they will use the same tail components, as they do on A320 and a321, A330-200 and A330-300.

Alternative tail feathers are normally only seen on extreme shrinks such as A318 and B747SP.



Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlinea380900 From France, joined Dec 2003, 1116 posts, RR: 1
Reply 2, posted (2 years 8 months 3 weeks 3 days 22 hours ago) and read 6535 times:

You seem to be right. I thought changing the tail size depending on the length of the fuselage was much more common. In fact it is quite rare.

Now it is often said that the A380-800 is to the A380 family what the A318 is to the A320 family. And one has to admit the tail is enormous. So maybe my question is still valid... Yet you are right, no difference among A319/A320/A321. No difference between A340-500 and A340-600. Maybe one between A340-200 and A340-300. But in most cases, the tail remains the same across the families. Too bad cause the longer A380 would have looked slicker with a smaller tail. Maybe if it's 15m longer!


User currently offlineslz396 From , joined Dec 1969, posts, RR:
Reply 3, posted (2 years 8 months 3 weeks 3 days 14 hours ago) and read 6427 times:

Quoting prebennorholm (Reply 1):
they will use the same tail components, as they do [...] on A330-200 and A330-300.

The A333 does have a different tail from the A332, you know?


User currently offlinea380900 From France, joined Dec 2003, 1116 posts, RR: 1
Reply 4, posted (2 years 8 months 3 weeks 3 days 12 hours ago) and read 6364 times:

Quoting slz396 (Reply 3):
The A333 does have a different tail from the A332, you know?

That is true: the height given by Airbus for the A332 is 1740 in the wikipedia drawing of the plane, 1685 for the A333. So the A333 tail is at least 55cm smaller. "At least" because as we know the A330 is slightly pointing down when on the ground so the longer A333 should have a higher tail if both tails were the same.


User currently offlinerheinwaldner From Switzerland, joined Jan 2008, 2245 posts, RR: 5
Reply 5, posted (2 years 8 months 3 weeks 15 hours ago) and read 5864 times:

Quoting a380900 (Reply 4):
"At least" because as we know the A330 is slightly pointing down when on the ground so the longer A333 should have a higher tail if both tails were the same.

I don't think because if the gears have equal length, the longer the fuselage the smaller the angle when on the ground.


User currently onlineLH707330 From United States of America, joined Jun 2012, 794 posts, RR: 0
Reply 6, posted (2 years 3 months 1 week 4 hours ago) and read 4309 times:

Quoting a380900 (Reply 2):
No difference between A340-500 and A340-600. Maybe one between A340-200 and A340-300.

The A342, 343, and 333 have the same (short) fin, while the 332, 345, and 346 got the tall one. Even though the 345 and 346 have a longer moment arm, the Trents are far more powerful than the hair dryers on the 342/343. Boeing had to change the rudder on the 748 to a double-hinge to regain authority, despite the fact that they stretched the aft fuselage (1.6m IIRC). My guess is that the 744 was at the absolute limit with its 62k engines and a rudder designed for 43k JT9Ds from the 741, so the 67k GEnX on the 748 necessitated the change.

With the 389, I suspect they'll keep the same fin as the 388, because the moment arm and extra engine thrust will cancel more or less. My guess is that the Airbus guys did their homework and future-proofed the fin for use with the 389 the same way they overbuild the 388 wings for a larger MTOW. That way, if they do go with the stretch, they can keep the production process the same without having to twiddle with anything.


Top Of Page
Forum Index

Reply To This Topic Shorter Vertical Stabilizer For The A380-900?
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Vertical Speed For The 733 posted Tue Aug 3 2004 01:30:51 by Pe@rson
A380 Vertical Stabilizer: posted Thu Apr 23 2009 23:14:36 by BooDog
738: "things" At The Bottom Of Vertical Stabilizer posted Sun Oct 14 2007 09:02:44 by F.pier
Hourly Operating Cost For The Q400, CRJ 700/900 posted Tue Jul 10 2007 13:56:59 by Vimanav
Whats That On The Vertical Stabilizer. posted Sat Nov 17 2001 04:44:09 by HAWK21M
The Most Boring Time For The Pilots posted Sun Oct 2 2011 23:05:58 by emrecan
Vertical Stabilizer Is It Essential? posted Wed Sep 28 2011 16:50:03 by polymerplane
Why Two Different Flight #s For The Same Flight? posted Wed Dec 29 2010 16:29:24 by krisyyz
Potable Water Hook Up On The A380 posted Sat Oct 30 2010 16:12:32 by contrails15
IT New Technology For The Airline Industry? posted Thu Oct 7 2010 18:53:54 by SlcDeltaRUmd11

Sponsor Message:
Printer friendly format