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View Diary: How Airliners Work - Weight and Balance (160 comments)

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  •  What "rule" is this? (2+ / 0-)
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    northsylvania, BlackSheep1

    There are many planes that are much wider than they are long. (E.g., the ASH-25 in the video I posted above. It has an 83' wingspan, with a 29.5' fuselage.)

    They fly fine, but but roll response is much slower than pitch response. There can also be some inter-axis couplings, but AFAIK that tends to be more of a problem with short wings (e.g., F-104).

    •  well, I was extrapolating (0+ / 0-)
      haven't talked about lateral (side to side) balance, just fore and aft. It's not a big deal with the passengers or cargo. The plane is much longer than it is wide, so there's not a lot of side to side moment. If the all chickens move to one side of the plane we're not going to do a barrel roll.

      LBJ, Lady Bird, Van Cliburn, Ike, Ann Richards, Barbara Jordan, Molly Ivins, Sully Sullenburger, Drew Brees: Texas is NO Bush League!

      by BlackSheep1 on Wed May 08, 2013 at 07:45:38 AM PDT

      [ Parent ]

      •  Some care... (1+ / 0-)
        Recommended by:
        BlackSheep1

        has to be taken in larger aircraft with relation to lateral w/b.

        As Major Kong noted, the maximum allowable fuel imbalance in his aircraft-of-choice has a limit of 1950 lbs. It also has interactions with aircraft structure -- wings usually or often have multiple tanks to stop or limit fuel movement between the wing root and wing tip. Fuel sloshing from one end to the other could make even an aircraft with identical amounts of fuel in each wing uncontrollable if most of the weight in one wing sloshes to the root and the other to the tip.

        This is also a problem in the longitudinal case -- there were fatal P-39 airacobra accidents in WW-II due to longitudinal fuel sloshing at landing time. (I don't know of any references to this, but heard it from a Lt. Col. who was tasked with investigating after ferry-flight crashes on successive days at the downwind-base turn.)

        •  wasn't one of those close to the end of (0+ / 0-)

          the service life of that aircraft?

          LBJ, Lady Bird, Van Cliburn, Ike, Ann Richards, Barbara Jordan, Molly Ivins, Sully Sullenburger, Drew Brees: Texas is NO Bush League!

          by BlackSheep1 on Wed May 08, 2013 at 10:25:25 AM PDT

          [ Parent ]

          •  Not AFAIK... (1+ / 0-)
            Recommended by:
            BlackSheep1

            These were being ferried to AK at the time, so they were likely destined for the Soviet Union. I don't know any reason service life should have entered into it, but apparently it was fairly sensitive to the total amount of fuel in the tank, and the ferry leg to Alaska was just the right distance if started w/ full tanks.

            •  oh, no, I think I was thinking when they (0+ / 0-)

              were being "retired" from US service as an aircraft, on the whole.

              LBJ, Lady Bird, Van Cliburn, Ike, Ann Richards, Barbara Jordan, Molly Ivins, Sully Sullenburger, Drew Brees: Texas is NO Bush League!

              by BlackSheep1 on Wed May 08, 2013 at 09:33:16 PM PDT

              [ Parent ]

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