Monitoring and control of watercraft propulsion efficiency

Details Monitoring and control of watercraft propulsion efficiency Monitoring and control of watercraft propulsion efficiency

2005-04-19

2005-04-19

Hofsass, Jeffery (Department: 2636)

Communications: electrical

Watercraft alarm or indicating systems

C340S995270, C340S979000, C440S049000, C440S063000, C440S076000

Reexamination Certificate

active

06882289

ABSTRACT:
Readout devices and controls are provided that alert the user to unusual propeller slip conditions. Embodiments of the invention incorporate some signal processing to account for a progressively greater slip at lower watercraft speeds. Thus, the invention provides simple information that tells the user if a boat propeller combination is being operated suboptimally, without requiring the knowledge and use of multiple slip figures for differing boat speeds. The invention allows greater economy of operation, automatic anticavitation control and can alert the watercraft operator to unusual conditions such as anchor down, propeller up other situations that affect propeller loading.

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