LTU932 From Germany, joined Jan 2006, 13864 posts, RR: 51 Posted (6 years 5 months 2 days 10 hours ago) and read 6925 times:
In all renders Boeing has released of the 777-200F, I noticed that they didn't put the side cargo door on the front side like on MD-11Fs or 727Fs, but on the aft side of the fuse, like on a 747. Here's an example:
KC135TopBoom From United States of America, joined Jan 2005, 11705 posts, RR: 52 Reply 3, posted (6 years 5 months 2 days 7 hours ago) and read 6883 times:
I know on the B-747F, it is placed behind the wing because of structual issues because of the humped fuselarge forward of the wing.
To me it looks like, on the B-777F, a clearence issue with the engine inlet. It may be so close there could be an issue of cargo handling equipment manuvering, and the possibility of hitting the engine inlet or cowling.
RyDawg82 From United States of America, joined Sep 2001, 818 posts, RR: 9 Reply 4, posted (6 years 5 months 2 days 7 hours ago) and read 6883 times:
Quoting LTU932 (Thread starter): Any assumptions on why Boeing decided to put the SCD on the 777-200F in the rear and not up front near the L1 door? What's the advantage of this?
Quoting Boeing.com: The 777 Freighter will be designed to integrate smoothly with existing cargo operations and facilitate interlining with 747 freighter fleets, which comprise about half of the world's freighter capacity. Cargo operators will be able to easily transfer 10-foot-high pallets between the two models via the large main deck cargo door.
I believe the door was located aft to accomplish this (height requirement).
-R
[Edited 2006-12-19 11:25:06]
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OldAeroGuy From United States of America, joined Dec 2004, 3206 posts, RR: 66 Reply 5, posted (6 years 5 months 2 days 1 hour ago) and read 6829 times:
Quoting KC135TopBoom (Reply 3): To me it looks like, on the B-777F, a clearence issue with the engine inlet.
Quoting Zenarcade (Reply 1): Going on a leg here, but maybe its to make sure uneven loading does not occur.
These are the two primary reasons, particularly the latter. With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
ZANL188 From United States of America, joined Oct 2006, 3244 posts, RR: 0 Reply 6, posted (6 years 5 months 1 day 15 hours ago) and read 6756 times:
Quoting OldAeroGuy (Reply 5): With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.
Virtually Impossible? I know some rampers who could do it easy.... I think putting the door aft makes it easier to do it right however, you wouldn't have to push a couple of cans or containers in first before pushing the first one into it's load planned location.
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OldAeroGuy From United States of America, joined Dec 2004, 3206 posts, RR: 66 Reply 8, posted (6 years 5 months 22 hours ago) and read 6689 times:
Quoting HAWK21M (Reply 7): Quoting OldAeroGuy (Reply 5):
With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.
Pls Elaborate.
regds
MEL
OK. As an example, let's consider a main deck cargo load of 27 96"x125" pallets.
With an aft door, 20 pallets are forward of the door, 2 are aligned with the door and 5 are aft of the door.
Also note that the aft door is not far behind the airplane gear while airplane OEW CG is in front of the main gear.
The natural progression of loading would have the forward pallets loaded first, the aft pallets loaded next and the door aligned pallets loaded last.
Having 20 pallets ahead of the door biases the loading CG to be forward.
Unless the loader loads the aft pallets first and/or the aft pallets are extremely heavy, the CG should always remain ahead of the gear during loading. Aft pallets heavy enough to shift the CG aft of the gear would also probably exceed the pallet and airplane floor load capability.
Note that I said virtually impossible. Willful neglect of a proper loading sequence is always possible.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
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