Originally Posted by ChuckSK
The maxprop is designed so that each blade pivots around a shaft projecting laterally from the central hub. The area of the blade aft of the shaft is greater than the area forward of the shaft. When the hub is rotated the blade encounters more resistance from the water
in the rear portion of the blade than in the forward portion. This difference in force on the blade causes it to rotate on the hub. The leading edge of the blade faces into the flow and trailing edge trails. This affect occurs whether the hub is rotating slowly or quickly.
There are stops in the hub to keep the blades from rotating past the preset pitch
There is a pinion gear
attached to the prop shaft and bevel gears machined into the blade hubs. When indexed properly the forward and aft pitch
The larger area of the trailing edge of the blade is what allows the prop to move. With the engine
off the larger aft ends trail and the prop is feathered. Under power water
resistance causes the blade to rotate on the pinion until the stop is reached. Same in reverse.
I suspect that with a trailing sea and "surfing" a bit down a wave the prop is unloading - slightly different than cavitating which is separation of flow on the unloaded side of the prop.
The sea running behind the prop would unload it and I suspect would feel like the prop is out of the water. I guess the analogy is like coming over the crest of a hill in a manual transmission
car. In 4th gear the engine
unloads - at the bottom of the hill it loads up again. It should not need to be put in neutral to correct and I don't think repitching will help, 3100 at WOT seems about right.