Ryan I'm confused.
Are you saying that if I stick my 10x4.5x4 GWS prop in the water it will load the motor less than if I run it in the air?

The vicosity of water is vastly denser than air. The apm draw on the air prop in the water would kill the motor and the speedo.
An airplane prop at speed uses less amps to maintain speed than a boat prop in the water uses to maintain speed.
that's why boat are so hard on electric setups.

I a person walks through a body of air he will expend less energy and move faster than if he was walking through a body of water.

Chris
Yah know This ins't comparing aples to apples since hydrodynamics and aerodynamics behave in different ways so eveny my logic I fear is faulty