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Humps on airliners

  • 27-03-2016 11:24am
    #1
    reklamos
    Registered Users, Registered Users 2 Posts: 793 ✭✭✭


    Hi all,
    Came back form US this week and noticed that many airliners there have humps on fuselage(see picture). Are these for internet as I have not seen these in Europe?
    Also the down facing winglets look strange on 738.


Comments

  • #2
    Ruu
    Closed Accounts Posts: 9,622 ✭✭✭Ruu


    I believe they are the satellite antenna.


  • #3
    Avada
    Closed Accounts Posts: 3,411 ✭✭✭Avada


    It's for wifi AFAIK.


  • #4
    The_Wanderer
    Registered Users, Registered Users 2 Posts: 2,064 ✭✭✭The_Wanderer


    The Aer Lingus A330's have them. It's for Wifi.


  • #5
    reklamos
    Registered Users, Registered Users 2 Posts: 793 ✭✭✭reklamos


    Have not seen them on A330 that I flew to and from US and both of them had wifi.


  • #6
    Tenger
    Moderators, Motoring & Transport Moderators Posts: 10,005 Mod ✭✭✭✭Tenger


    reklamos wrote: »
    Have not seen them on A330 that I flew to and from US and both of them had wifi.

    EI A330's all have them, they are back behind the wings,you can see one just to the right of this shot
    https://www.flickr.com/photos/38016434@N05/17147382308/in/photolist-pYLpG4-rkdSkj-rtCsfh-s8fPmy-tzwn2G-qt2NUN-s675MT-rro6UH-d77Rsd-qyKMc7-rnXimG-rgaH3y-ukenmc-qyGsAg-nKVswo-qjGrXi-oQZhWt-pKd1Bv-pS42Nk-rshWVA


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  • #7
    arubex
    Registered Users, Registered Users 2 Posts: 1,197 ✭✭✭arubex


    Avada wrote: »
    It's for wifi AFAIK.

    Well technically it's not for the Wifi which is a LAN wholly internal to the aircraft, it's for the satellite-link WAN.

    You can have a Wifi LAN without the external link, in fact some US carriers have that on subfleets to stream media from onboard servers. No external lumps in that case.


  • #8
    The King of Dalriada
    Closed Accounts Posts: 59 ✭✭The King of Dalriada


    Can't post links yet, but if you search YouTube for "United wifi installation" you'll see a good video.


  • #9
    L1011
    Registered Users, Registered Users 2 Posts: 71,186 ✭✭✭✭L1011


    arubex wrote: »
    Well technically it's not for the Wifi which is a LAN wholly internal to the aircraft, it's for the satellite-link WAN.

    You can have a Wifi LAN without the external link, in fact some US carriers have that on subfleets to stream media from onboard servers. No external lumps in that case.

    Some of them also have Wifi but use ground-based systems where the hump is under the fuselage rather than on top. This means no coverage between the contigious states and Alaska/Hawaii/even some routes to New England though.


  • #10
    Avada
    Closed Accounts Posts: 3,411 ✭✭✭Avada


    arubex wrote: »
    Well technically it's not for the Wifi which is a LAN wholly internal to the aircraft, it's for the satellite-link WAN.

    You can have a Wifi LAN without the external link, in fact some US carriers have that on subfleets to stream media from onboard servers. No external lumps in that case.

    ^^^ What he said.


  • #11
    squonk
    Registered Users, Registered Users 2 Posts: 9,990 ✭✭✭squonk


    Seeing the title I thought this was a thread about the Mile High Club :)


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  • #12
    Shannon757
    Closed Accounts Posts: 22,847 ✭✭✭✭Shannon757


    squonk wrote: »
    Seeing the title I thought this was a thread about the Mile High Club :)

    You and you're dirty mind ;)


  • #13
    Cessna_Pilot
    Registered Users, Registered Users 2 Posts: 703 ✭✭✭Cessna_Pilot


    You're all wrong. It's where the chemical formula for chemtrails is stored


  • #14
    Gaoth Laidir
    Registered Users, Registered Users 2 Posts: 8,221 ✭✭✭Gaoth Laidir


    I assume this has some detrimental effect on aerodynamics and hence fuel-burn. Probably not much but still would add up to a few miles over a longhaul flight.


  • #15
    Tenger
    Moderators, Motoring & Transport Moderators Posts: 10,005 Mod ✭✭✭✭Tenger


    Gaoth Laidir wrote: »
    I assume this has some detrimental effect on aerodynamics and hence fuel-burn. Probably not much but still would add up to a few miles over a longhaul flight.
    Installation costs and fuel burn costs over its lifespan. The accountants tot this up against the benefit of having reliable comms with the aircraft and/or wi-fi available for the pax as a product or as an ancilliary revenue stream.


  • #16
    Bussywussy
    Registered Users, Registered Users 2 Posts: 956 ✭✭✭Bussywussy


    i replaced the gcs antenna recently,i had the figure for fuel burn penalty in the CMM,its actually more than a missing winglet if I recall correctly!!!!


  • #17
    Third_Echelon
    Registered Users, Registered Users 2 Posts: 4,889 ✭✭✭Third_Echelon


    I did my Thesis on this subject 13 years ago... Good to see it is finally being more widely adopted :-)


  • #18
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    hump install



  • #19
    markpb
    Registered Users, Registered Users 2 Posts: 9,391 ✭✭✭markpb


    gctest50 wrote:
    hump install

    Any idea why the inside rotates, does it track a specific satellite?


  • #20
    Growler!!!
    Registered Users, Registered Users 2 Posts: 1,980 ✭✭✭Growler!!!


    markpb wrote: »
    Any idea why the inside rotates, does it track a specific satellite?


    It will track one of these 4 Inmarsat sats

    Atlantic East or West region
    Indian Ocean region
    Pacific Ocean region


    image.jpg


  • #21
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    markpb wrote: »
    Any idea why the inside rotates, does it track a specific satellite?

    and makes up for the aircraft bouncing around, bit like cats & owls n stuff







    GoGo internet use ground based antennas, & faster ( but higher latency ) satellite

    Their 2Ku has one antenna for uplink, one for downlink = much happiness

    http://commercial.gogoair.com/connectivity/technologies/2ku


    http://www.sec.gov/Archives/edgar/data/1537054/000119312513269209/d551124d424b4.htm


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