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      gebbw


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      Post #53593, posted on 06-08-2014 GMT-5 hours    
      Been looking at photos of 757s and noticed the aft fuselage seems to be 'fatter' than the forward section. Why is this? I thought the fuselage was the same as the 707 etc? Is it only the forward section that is the same?

      It is noticeable in this photo:http://sirsteveincairns.smugmug.com/Airplanes/AIR-NIUGINI/i-6vLPs3p/A

      George

      George
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      Laurent


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      Post #53594, posted on 06-08-2014 GMT-5 hours    
      George,

      The 727 had the same feature: http://www.planespotters.net/Aviation_Photos/photo.show?id=033610

      Laurent

      So many planes, so little time ...

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      AAMD11


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      Post #53597, posted on 06-08-2014 GMT-5 hours    
      Laurent, I was going to point out the same thing about the 727.

      However, it is understandable with the 727 for added strength to support the three engines mounted back there.

      As far as I know the only thing that is the same regarding the 707 with the 757 is the width of the cabin. The fuselages are not the same except for the diameter.


      Jerry

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      Jennings


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      Post #53599, posted on 06-08-2014 GMT-5 hours    
      The cross section of the constant diameter sections of the 707, 727, 737, and 757 fuselage are all identical on the upper lobe. The 707 has a deeper lower lobe cross section, which is shared with the aft portion of the 727 and 757 fuselages. I'm not aware that it has anything to do with strength (Boeing is perfectly capable of building a small, strong structure), but everything to do with cargo capacity and fuel capacity. The 737 shares the shallower lower lobe with the forward ends of the 727 and 757 throughout its entire fuselage length.

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      gebbw


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      Post #53603, posted on 06-09-2014 GMT-5 hours    
      Aha! thanks J.

      Can't help but think of this when I see the aft-end of a 757 now...






      Ahmed - plse remove this post if not appropriate

      George

      George
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