Comments on: Boeing 777 Freighter http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/ Tue, 06 Jan 2009 23:16:04 +0000 http://wordpress.org/?v=2.7 hourly 1 By: James Baloun http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/comment-page-1/#comment-956 James Baloun Sun, 13 Apr 2008 08:10:11 +0000 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/#comment-956 Quick search found the following: http://www.cargoair.org/issues/AC_120-85.pdf AC 120-85 From pg 62: [quote] Flutter Substantiation.* A cargo conversion can change the fuselage stiffness or change the mass distribution, which can have an effect on the aircraft’s flutter characteristics, particularly aft cargo doors. [/quote] From pg 3: [quote] James J. Ballough Director, Flight Standards Service [/quote] Ok, not that is just weird. Quick search found the following:

http://www.cargoair.org/issues/AC_120-85.pdf

AC 120-85

From pg 62:

[quote]
Flutter Substantiation.* A cargo conversion can change the fuselage stiffness or change the mass distribution, which can have an effect on the aircraft’s flutter characteristics, particularly aft cargo doors.
[/quote]

From pg 3:

[quote]
James J. Ballough
Director, Flight Standards Service
[/quote]

Ok, not that is just weird.

]]> By: James Baloun http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/comment-page-1/#comment-955 James Baloun Sun, 13 Apr 2008 07:33:24 +0000 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/#comment-955 Bob, Can you briefly explain (or point to a reference) to those of us who are not aerodynamicists the flutter problem with aft fuselages and aft cargo doors? I recall one of the few minor problems with the 777 initial flight test was a slight tendency to wag it's tail. Is it that hard to strengthen the torque box around the door or add a few more frame stabilizers in the aft fuselage and adjust systems like the yaw damper? The door install is a bit of work but can be done. Does the disruption to the semi-monocoque shell cause a problem with the natural frequency? Bob,
Can you briefly explain (or point to a reference) to those of us who are not aerodynamicists the flutter problem with aft fuselages and aft cargo doors? I recall one of the few minor problems with the 777 initial flight test was a slight tendency to wag it’s tail. Is it that hard to strengthen the torque box around the door or add a few more frame stabilizers in the aft fuselage and adjust systems like the yaw damper? The door install is a bit of work but can be done. Does the disruption to the semi-monocoque shell cause a problem with the natural frequency?

]]> By: BOEING777 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/comment-page-1/#comment-954 BOEING777 Fri, 11 Apr 2008 17:09:47 +0000 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/#comment-954 To interline with the 747F fleets (non converted airplanes), both 777F and 747F have the side cargo doors at the rear. http://www.boeing.com/commercial/777family/news/2007/q2/070611d_nr.html "The 777 Freighter is designed to complement 747 cargo operations with the ability to transfer shipments directly between the two airplanes. The main cargo door of the 777 Freighter will be sized to accommodate 10-foot-high (three-meter) pallets for easy interlining with 747 freighters. The 747 freighter fleet comprises about half of the world's freighter capacity. " To interline with the 747F fleets (non converted airplanes), both 777F and 747F have the side cargo doors at the rear.

http://www.boeing.com/commercial/777family/news/2007/q2/070611d_nr.html

“The 777 Freighter is designed to complement 747 cargo operations with the ability to transfer shipments directly between the two airplanes. The main cargo door of the 777 Freighter will be sized to accommodate 10-foot-high (three-meter) pallets for easy interlining with 747 freighters. The 747 freighter fleet comprises about half of the world’s freighter capacity. “

]]> By: bob watson http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/comment-page-1/#comment-952 bob watson Thu, 10 Apr 2008 23:41:41 +0000 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/#comment-952 Why was the 777 F designed with the MCD aft of the TE of the wing, where the Airplane would require expensive flutter testing rathere than forward of the wing? Bob Watson Why was the 777 F designed with the MCD aft of the TE of the wing, where the Airplane would require expensive flutter testing rathere than forward of the wing?

Bob Watson

]]> By: Falcon http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/comment-page-1/#comment-951 Falcon Thu, 10 Apr 2008 22:05:16 +0000 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/#comment-951 Jacobin777. With the 787 getting delayed again it seems resources were taken from the 787 to the 777F instead… Jacobin777.

With the 787 getting delayed again it seems resources were taken from the 787 to the 777F instead…

]]> By: Jacobin777 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/comment-page-1/#comment-950 Jacobin777 Thu, 10 Apr 2008 20:39:39 +0000 http://www.fleetbuzzeditorial.com/2008/04/10/boeing-777-freighter/#comment-950 ..I cannot wait to see this beauty fly. At least this stops the "naysayers" who have been saying that the B787 program would put a "crimp" on the B77F program...wrong! ..I cannot wait to see this beauty fly. At least this stops the “naysayers” who have been saying that the B787 program would put a “crimp” on the B77F program…wrong!

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