http://www.mercurymarine.com/propell...opellers-work/
This is the best description of how I have understood a prop to work. Water is always flowing in behind the prop to fill the "void" created when water is pushed off the prop rearward, otherwise a positive pressure is always building on the forward facing surface. The prop doesn't unload until the thrust surface is clear of the water. It begins to unload when the leading edge breaks surface and begins to load as the biting edge hits water In a flatty the leading edge never fully unloads. Interference from the strut and boat surface etc. would effect loading not the clocking of the prop .Does a box fan not throw a constant stream of air equally for each blade? Or is this all what Gn was saying and I was hearing it wrong?