N62NA From United States of America, joined Aug 2003, 3683 posts, RR: 4 Reply 1, posted (4 months 3 weeks 4 days 18 hours ago) and read 23794 times:
Satellite dish for internet?
Quoting btfarrwm (Thread starter): AA's new 777 has a hump above the 2nd door. In searching the database, I don't see it on other T7. Anyone know the purpose?
sevenheavy From United Kingdom, joined Mar 2004, 1126 posts, RR: 10 Reply 2, posted (4 months 3 weeks 4 days 18 hours ago) and read 23737 times:
Its probably for Wifi comms equipment. I'm pretty sure I read these aircraft have it installed and I've seen similar "humps" on other WiFi equipped aircraft (WN B73G's, DL etc.)
kl692 From Canada, joined Feb 2006, 651 posts, RR: 0 Reply 10, posted (4 months 3 weeks 4 days 9 hours ago) and read 18554 times:
Quoting btfarrwm (Thread starter): AA's new 777 has a hump above the 2nd door. In searching the database, I don't see it on other T7. Anyone know the purpose?
I don't know how old TC-JJI is but it sure looks like it have one too
a300 american From United States of America, joined Jan 2000, 171 posts, RR: 1 Reply 12, posted (4 months 3 weeks 4 days ago) and read 10765 times:
Quoting YVRFlyer (Reply 11): Out of curiosity, what kind of drag/fuel penalty does the bump and extra weight typically put on an aircraft? I can't find any info on that.
great question, I'd like to know as well..............
VHHYI From Australia, joined Oct 2007, 97 posts, RR: 0 Reply 13, posted (4 months 3 weeks 3 days 22 hours ago) and read 9400 times:
Quoting YVRFlyer (Reply 11): Out of curiosity, what kind of drag/fuel penalty does the bump and extra weight typically put on an aircraft? I can't find any info on that.
airbazar From United States of America, joined Sep 2003, 6890 posts, RR: 7 Reply 14, posted (4 months 3 weeks 3 days 22 hours ago) and read 9252 times:
Quoting YVRFlyer (Reply 11): Out of curiosity, what kind of drag/fuel penalty does the bump and extra weight typically put on an aircraft? I can't find any info on that.
Or better yet, why is a "hump" even necessary? Is the equipment that large that it won't fit without altering the exterior?
andytb77 From United States of America, joined Dec 2008, 26 posts, RR: 0 Reply 15, posted (4 months 3 weeks 3 days 22 hours ago) and read 8764 times:
Quoting YVRFlyer (Reply 11): Out of curiosity, what kind of drag/fuel penalty does the bump and extra weight typically put on an aircraft? I can't find any info on that.
Quoting a300 american (Reply 12): great question, I'd like to know as well..............
Agreed; great question. I'd also like to know if the location of the dome on the fuselage makes a difference. On the 77W it's obviously forward, and on the 737s it's toward the aft portion
spchamp1 From United States of America, joined Apr 2010, 87 posts, RR: 0 Reply 16, posted (4 months 3 weeks 3 days 22 hours ago) and read 8563 times:
It is a satellite dish basically. B6 has them on their aircraft and that is what receives the DirecTV satellite signal for the TV's onboard. With the new ViaSat WiFi option coming onboard soon, all existing dishes will need to be replaced with ones that are capable of receiving the ViaSat signal. These new dishes will be a bit bigger and require a bigger housing than the ones currently affixed to the a/c.
dalmd88 From United States of America, joined Jul 2000, 2366 posts, RR: 15 Reply 17, posted (4 months 3 weeks 3 days 21 hours ago) and read 7497 times:
Quoting airbazar (Reply 14): Or better yet, why is a "hump" even necessary? Is the equipment that large that it won't fit without altering the exterior?
The dish mounts on the exterior of the fuselage. It sits on a platform that conforms to the surface and give a nice large flat mounting surface. The dish itself is a large flat platter about 2 ft across that rotates to aline with the overhead satellite. To get a signal it has to be exterior of the skin. The radome is to protect the dish and provide aerodynamics. Weight is really much. The radome is really nothing and even the dish assembly can be moved by one person.
pdxswa From United States of America, joined Jul 2007, 21 posts, RR: 0 Reply 20, posted (4 months 3 weeks 3 days 20 hours ago) and read 5802 times:
AIRLINERS.NET CREW PHOTO SCREENER
Cathay Pacific obviously have another brand of WiFi dome. There's is located aft as is seen on B-KQB. It looks better near the back as seen on this Cathay 77W. With the WiFi dome up front. It breaks up the clean lines of the 77W.
tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80 Reply 21, posted (4 months 3 weeks 3 days 19 hours ago) and read 5167 times:
Quoting airbazar (Reply 14): Or better yet, why is a "hump" even necessary? Is the equipment that large that it won't fit without altering the exterior?
It'll fit inside but it can't see through the skin. To put it inside you'd have to splice a non-conductive piece of structural skin into the existing skin. That is, to put it mildly, a challenging structural issue and you'd probably gain as much weight on the splice as you saved on drag.
25 DuncanTruro: These 'humps' are not dishes, but an array of electrically steered antennas on a machined mount, with an aerodynamic cover, used for satellite communi
26 DocLightning: I'm having trouble visualizing why side-mounted dishes would be less able to pick up the comsats in the polar regions. If the birds are in geosynchro
27 YVRFlyer: Thank you for that, VHHYI! Doing a back-in-the-head calculation (I'm probably off the mark), on an ULH flight the lost opportunity (i.e. extra weight
28 FI642: My friends at WN said that the dish almost negates the benefit of winglets on their 737's
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