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Bob Chilcoat wrote:
Ron, I posted this over on RAP but apparently managed to stump everyone. I thought that perhaps some of your contacts at Boeing might know if this word, "unporting" was misused by Gann, or is an old term that is no longer used. It just doesn't sound right to me. Before Ron provides you the right answer, let me offer what is probably a wrong one. This is what the internet is all about...wild ass guessing at it's finest. "Unporting is the balance destruction of the elevators by aerodynamic force. I won't confuse you with theory, but if enough separation between the fixed and the balance portion of your elevators occurs, your airplane will go into a vertical dive or even beyond the vertical, and no two men in the world are strong enough to bring it out. This can be caused by a missing hinge bolt." I'm guessing that it has something to do with the flow of air between the top (high pressure) side of the elevator and the bottom through the gap between the fixed and movable pieces, which for certain geometries and separation can enter an unstable mode (flutter). How close am I? |
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