Airlinercafe Home Page

Stop being a lurker - join our community and get involved. Sign up and start a conversation!
 

      Author Message

      iaf-man


      Members

       Online status  

       
      Add As Buddy
      Posts: 21
      Location: Israel
      Occupation: Gas turbines power station
      Age: 55

      Post #66284, posted on 03-03-2017 GMT-5 hours    
      Look at this photo,taken right after take off-something doesn't look right to me
      https://www.facebook.com/photo.php?fbid=828758403932537&set=gm.1302146819867889&type=3&theater
      I remember(worked some time on 707) fuel dump on this kind of plane located amid the wing by means of a drop down(spring loaded?) drain tube,under both wings.
      Fuel drain usually is done symmetricaly,that's why it looks odd,it doesn't look like a vortex too
      Isaac

      Author Message

      LH707


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 883
      Location:
      Occupation:
      Age:

      Post #66288, posted on 03-03-2017 GMT-5 hours    
      Can't see it, wrong page permissions. Could you post a copy as an image?

      Author Message

      iaf-man


      Members

       Online status  

       
      Add As Buddy
      Posts: 21
      Location: Israel
      Occupation: Gas turbines power station
      Age: 55

      Post #66289, posted on 03-03-2017 GMT-5 hours    

      Author Message

      Jennings


      Contributors

       Online status  

       
      Add As Buddy
      Posts: 3624
      Location: The great desert southwest, USA
      Occupation: Nurse Anesthetist
      Age: 115

      Post #66290, posted on 03-03-2017 GMT-5 hours    
      I think you're confusing the DC-8 and the 707. The DC-8's fuel dump did have a fold-down pipe on the lower side of the wing. The 707 has no such device, as the photo shows.

      Author Message

      iaf-man


      Members

       Online status  

       
      Add As Buddy
      Posts: 21
      Location: Israel
      Occupation: Gas turbines power station
      Age: 55

      Post #66291, posted on 03-03-2017 GMT-5 hours    
      Maybe it was DC-8,they were too in our hangar
      But how then the 707 dumped their fuel?

      Author Message

      XRadar


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 1320
      Location:
      Occupation: Keeping the skies safe
      Age: 123

      Post #66292, posted on 03-03-2017 GMT-5 hours    
      That is a Chemtrail. I believe when colored white, from right wing spray point is for consumer spending.

      Keep em separated!
      Steve

      Author Message

      LH707


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 883
      Location:
      Occupation:
      Age:

      Post #66295, posted on 03-03-2017 GMT-5 hours    
      That's the fuel tank vent letting a bit of fuel out. In the wingtips there are small vent tanks for fuel to expand into if it heats up (e.g. cold fuel pumped into tank on warm day), as well as vents to let in air as fuel burns off. Sometimes expanded fuel makes its way out these tank vents as in that picture.

      Author Message

      iaf-man


      Members

       Online status  

       
      Add As Buddy
      Posts: 21
      Location: Israel
      Occupation: Gas turbines power station
      Age: 55

      Post #66296, posted on 03-03-2017 GMT-5 hours    
      Thanks for that!!
      They use ram air for ventilation?
      Aren't the fuel tanks pressurized by engines' bleed air?

      Author Message

      Jennings


      Contributors

       Online status  

       
      Add As Buddy
      Posts: 3624
      Location: The great desert southwest, USA
      Occupation: Nurse Anesthetist
      Age: 115

      Post #66298, posted on 03-03-2017 GMT-5 hours    
      The cabin is pressurized (like all jet airliners except the 787) by engine bleed air (not ram air). The very hot compressor bleed air is conditioned via air cycle machines (air conditioners) that operate via heat exchangers that use ram air.

      I don't believe the fuel tanks on 707s are pressurized, but it's been eons since I looked at anything like that.

      Author Message

      iaf-man


      Members

       Online status  

       
      Add As Buddy
      Posts: 21
      Location: Israel
      Occupation: Gas turbines power station
      Age: 55

      Post #66300, posted on 03-04-2017 GMT-5 hours    
      A good read
      http://lessonslearned.faa.gov/ll_main.cfm?TabID=4&LLID=46&LLTypeID=2#null
      Somehow I thought all jets have pressurized fuel systems,like in military
      Apparently not

      Author Message

      iaf-man


      Members

       Online status  

       
      Add As Buddy
      Posts: 21
      Location: Israel
      Occupation: Gas turbines power station
      Age: 55

      Post #66301, posted on 03-04-2017 GMT-5 hours    
      Quote
      XRadar :
      That is a Chemtrail. I believe when colored white, from right wing spray point is for consumer spending.



      Of course,how we could think otherwise
      they missed the green spray for increasing our greed))))

      Author Message

      Jennings


      Contributors

       Online status  

       
      Add As Buddy
      Posts: 3624
      Location: The great desert southwest, USA
      Occupation: Nurse Anesthetist
      Age: 115

      Post #66304, posted on 03-04-2017 GMT-5 hours    
      We hardly need help to increase that...

      Author Message

      selier


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 249
      Location: Haarlem
      Occupation: Retired A&P Maintenance Controller
      Age: 73

      Post #66332, posted on 03-06-2017 GMT-5 hours    
      By the way the B-707 does have fuel dump valve's as well.

      Have fun modeling! Bert IPMS Netherlands 90002
      selier@airlinercafe.com
      Around here I have a very Responsible Job.... every time
      something goes wrong I'm RESPONSIBLE

      Author Message

      AAMD11


      Members

       Online status  

       
      Add As Buddy
      Posts: 131
      Location: ABQ
      Occupation:
      Age:

      Post #66342, posted on 03-06-2017 GMT-5 hours    
      Just an observation, but why does it look like it is coming from atop the wing and not from below the wing?

      Author Message

      selier


      Upper Deck Member

       Online status  

       
      Add As Buddy
      Posts: 249
      Location: Haarlem
      Occupation: Retired A&P Maintenance Controller
      Age: 73

      Post #66673, posted on 03-26-2017 GMT-5 hours    
      That's just what it is. When fuel are dumped it's a haze, and easy to think it's coming from the top side off the wing.

      regards Bert

      Have fun modeling! Bert IPMS Netherlands 90002
      selier@airlinercafe.com
      Around here I have a very Responsible Job.... every time
      something goes wrong I'm RESPONSIBLE

      Author Message

      Jennings


      Contributors

       Online status  

       
      Add As Buddy
      Posts: 3624
      Location: The great desert southwest, USA
      Occupation: Nurse Anesthetist
      Age: 115

      Post #66675, posted on 03-26-2017 GMT-5 hours    
      Wingtip vortices. It's coming out the dump and being swirled up from the relatively high pressure area on the bottom of the wing to the relatively low pressure area on top of the wing.

      You can clearly see the vortex swirled shape as it trails behind the airplane.