Looking for Dennis Gallotti low-altitude visual effects letter
Just a few months ago there was a training article in SOARING magazine on pivotal altitudes. If this is what you are thinking about, although not the author you are looking for, it is about how seeing more ground and less sky down lower causes a tendency to pitch up; thus getting slow.
Even if this is not the subject you are interested, nonetheless it is a good subject to teach.
Raul
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