Abstract: A system for measuring propeller apparent slip and angle of attack includes a main console housing a processor. The system measures vessel speed with a pitot tube, pressure transducer, and the processor; and measures engine speed with an inductive pickup and the processor. The processor is programmed with algorithms for determining apparent slip and angle of attack. When the engine gear ratio, propeller diameter, and propeller pitch are manually provided to the processor, the processor computes apparent slip and angle of attack on a substantially real-time basis. The processor routes information to a display screen in the main console, and also to a data logger for permanent data storage.

Abstract: A system for measuring propeller apparent slip includes a main console housing a processor. The system measures vessel speed with a pitot tube, pressure transducer, and the processor; and measures engine speed with an inductive pickup and the processor. The processor is pre-programmed with an algorithm for determining apparent slip. When the engine gear ratio and propeller pitch are manually provided to the processor, the processor computes apparent slip on a substantially real-time basis. The processor routes information to a display screen in the main console, and also to a data logger for permanent data storage.