<div class="htmlview paragraph">Dynamic stall has been the subject of much research but there is still some uncertainty about several aspects. Almost all research to date has involved experiments or computational fluid dynamics, both, in essence, trying to duplicate the phenomena. The present research takes a different tack by trying to develop a phenomenological model that will allow greater insight into the relationship between various physical elements that are present in the flow. The research indicates a fairly simple explanation for dynamic stall and identifies the controlling factors.</div>