Buckingham Pi Theorem Propeller thrust (a force) of a boat's motor depends on the diameter and angular velocity of the propellers, the boať's speed, and the density and viscosity of the liquid the...

Extracted text: Buckingham Pi Theorem Propeller thrust (a force) of a boat's motor depends on the diameter and angular velocity of the propellers, the boať's speed, and the density and viscosity of the liquid the boat is in. How many factors of influence need to be considered? How many pi groups are needed if we use F, L, I dimensions?