·one of the most complex drives is the contra rotating propeller with variable pitch control in three at the two counter rotating props recover.
·most of the slip stream rotational energy and the blade numbers are offset to avoid vibration.
·the variable pitch is to increase efficiency and maneuverability.
·so 100 percent of the engine power remains at the propeller.
·it can shift speed or even reverse without the dead time and overall.
·it's one of the more efficient systems out there.
·the complete drive is quite complex and expensive and in turn.
·the subcomponents are typically used independently from each other.