Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Can You Have A 748F With A Streched Bubble  
User currently offlineImag From United Kingdom, joined Feb 2007, 197 posts, RR: 0
Posted (5 years 6 months 1 week 2 days 13 hours ago) and read 3446 times:

Hello

If someone wanted a 748F with the stretched upper deck like the 748i, is that possible? Ie have a 748i body with the nose opening? Would there be any restrictions on what can be carried on the upper deck, say extra seating/bedding for pilots or extra carrying capacity?

Obviously there would be extra issues like getting more people up into the bubble up the small ladder, but in theory is this possible?

Thanks

10 replies: All unread, jump to last
 
User currently offlineB777LRF From Luxembourg, joined Nov 2008, 1387 posts, RR: 3
Reply 1, posted (5 years 6 months 1 week 2 days 13 hours ago) and read 3371 times:

If you threw enough money at Boeing, I'm sure it could be done. But why would you make such a daft move? The standard upper-deck has more than enough space at it is; in fact quite a few B747-400SF conversions have put a bulkhead on the upper-deck as there is no need, at all, for all that space.

Try having a look at the upper-deck of existing B747-400Fs and you'll find most operators have a rather sizeable galley, between 4 and 8 business-class seats + bunks for between 4 to 6 people. Really, what more do you need?

Getting people up the stairs from the main-deck is not any issue, getting them evacuated in case of an emergency would be. But that's not an issue either, as the door (there's only one; the LH one is blocked) is fitted with a slide, which can be used as an inflateable and is, if memory serves me right, certified to carry 20 people - more than any 747F will ever carry.

Your idea is, I'm afraid, not viable.



From receips and radials over straight pipes to big fans - been there, done that, got the hearing defects to prove
User currently offlineJbernie From Australia, joined Jan 2007, 880 posts, RR: 0
Reply 2, posted (5 years 6 months 1 week 2 days 12 hours ago) and read 3214 times:

I guess military operators could find potential in such an aircraft as you could carry cargo & the extra space upstairs could be used for troops/technical support in good comfort but I am not sure that the demand would be there, but if you are willing to pay (like QF on their 744ER) then Boeing will accomodate you if the build is in fact possible.

User currently offline413x3 From United States of America, joined Jul 2008, 1983 posts, RR: 0
Reply 3, posted (5 years 6 months 1 week 2 days 12 hours ago) and read 3195 times:

the whole point of cargo aircraft is to cut down on all unnecessary weight. having that big upper deck just takes away from fuel and cargo loads and thus would hurt your bottom line

User currently offlineLitz From United States of America, joined Dec 2003, 1767 posts, RR: 0
Reply 4, posted (5 years 6 months 1 week 2 days 12 hours ago) and read 3185 times:
Support Airliners.net - become a First Class Member!

Doesn't the upper deck on a747 intrude into the main deck's airspace (e.g. : the floor of the upper deck is below the crown of the ceiling) ?

If so, it would then restrict the amount of cargo you can put in the nose (and under the upper deck), whereas rearward of that point, you can load full circumference cargo.

Therefore, if you put in a standard upper deck (which, as noted, provides plenty of usable space for crew + pax) you carry more cargo. And when your airplane carries cargo for a living, this is never a bad thing.

- litz


User currently offlineFrancoflier From France, joined Oct 2001, 3790 posts, RR: 11
Reply 5, posted (5 years 6 months 1 week 2 days 2 hours ago) and read 2937 times:



Quoting Litz (Reply 4):
Doesn't the upper deck on a747 intrude into the main deck's airspace (e.g. : the floor of the upper deck is below the crown of the ceiling) ?

You are entirely correct. Freighters make no money carrying people, and the extended upper deck reduces the volume available for freight on the main deck. It is one of the disadvantages of the -400BCF over the straight -400F.

I suppose it could be done, at a cost, but unless for a very specific use, it would be completely useless. Not to mention that the resale value of the aircraft would drop a lot.



Looks like I picked the wrong week to quit posting...
User currently offlineHa763 From United States of America, joined Jan 2003, 3663 posts, RR: 5
Reply 6, posted (5 years 6 months 1 week 7 hours ago) and read 2698 times:
Support Airliners.net - become a First Class Member!

The -400BCF still has the extended hump, but under that the upper deck floor is reduced to allow the same amount of 10ft high pallets as a -200F, but 2 less than a -400F. However, the -400BCF does have the ability to carry 30 pallets, the same as the -400F and 1 more than a -200F. You only lose a small amount of volume compared to the -400F, but still have more volume than the -200F and longer range than the -200F.

User currently offlineDocLightning From United States of America, joined Nov 2005, 19944 posts, RR: 59
Reply 7, posted (5 years 6 months 1 week 6 hours ago) and read 2678 times:

I understand that a benefit of stretching the hump was that it fits better in with the area rule by overlapping with the wings.

However, my guess is that the cost analysis is that the extra weight doesn't merit a section of completely unused space almost the size of a 736 just to help out the aerodynamics a bit.


User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 8, posted (5 years 6 months 1 week 6 hours ago) and read 2664 times:



Quoting DocLightning (Reply 7):
I understand that a benefit of stretching the hump was that it fits better in with the area rule by overlapping with the wings.

If there was any aerodynamic advantage to gained with the stretched upper deck, it could be achieved by use of a non-structural fairing in lieu of pressurized mental structure.


User currently offlinePGNCS From United States of America, joined Apr 2007, 2833 posts, RR: 45
Reply 9, posted (5 years 6 months 5 days 14 hours ago) and read 2456 times:



Quoting 474218 (Reply 8):
pressurized mental structure

I have never heard this term in connection with a Boeing airplane before, but I like it! Big grin


User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 10, posted (5 years 6 months 5 days 12 hours ago) and read 2435 times:



Quoting PGNCS (Reply 9):
I have never heard this term in connection with a Boeing airplane before, but I like it!

a-net's spell check just doesn't catch those wrong word that are spelled correctly.


Top Of Page
Forum Index

Reply To This Topic Can You Have A 748F With A Streched Bubble
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...
Can You Do A PT In Lieu Of A Hold For A Rnav Appro posted Mon Dec 22 2008 15:39:28 by Spudsmac
Can Someone Help Me With Operating Costs For A DC9 posted Fri May 23 2008 09:35:10 by A380US
Can You Fly Over "Old Faithful" In Yel. Nat. Park? posted Wed Apr 30 2008 16:12:10 by Vio
Can You Add AC Vents? posted Sat Feb 2 2008 14:32:57 by DeltaL1011man
Pilots: What If You Have A Bad Day? posted Sun Jan 20 2008 20:39:09 by Jawed
How Can You Easily Tell Pratt/RR/GE Engines Apart? posted Tue Jan 15 2008 16:12:45 by JAGflyer
Can This Be Done With A 747-200 posted Sat Jul 14 2007 00:38:15 by Blackbird
Can You Pre-fuel The Aircraft The Night Before? posted Sun Apr 1 2007 06:05:29 by Carfield
Can You Identify This A/c? posted Mon Mar 19 2007 01:13:26 by Jafa39
Can You Identify This Device In This A319! posted Sun Feb 4 2007 14:46:51 by Aak777

Sponsor Message:
Printer friendly format