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Hello Bob
Can you help me on this question
In flight the Indicated airspeed is progressively reduced from normal cruise speed to maximum endurance speed. What happens to longitudinal stability?
Now, that's a fairly broad-brush question and not one for which there are simple answers. Perhaps you might give us a little more information as to just what you are trying to establish or determine ? Whence came the original question ?
(You could have a read through NASA TN D-6629 if you want some brain strain - https://ntrs.nasa.gov/search.jsp?R=19720012356)
Engineering specialist in aircraft performance and weight control.