Measuring and testing – Navigation – Take-off and landing monitors
Patent
1975-01-06
1976-07-13
Woodiel, Donald O.
Measuring and testing
Navigation
Take-off and landing monitors
73387, 23515026, G01C 2120
Patent
active
039686841
ABSTRACT:
Apparatus and a method for use in determining the optimum direction of progress of a sailing vessel from one point to a second point are described. The angle of leeway between the direction of heading of the vessel and the course of the vessel is measured and the course of the vessel is set to a required apparent wind direction so as to obtain the sum of the angle , leeway and the angle of the apparent wind direction with respect to the direction of heading. The distance covered by the vessel relative to the apparent wind in a given space of time is measured. Simultaneously the distance covered by the vessel relative to the water in said space of time is measured. The quotient of the measured water distance divided by the measured air distance is obtained, and a chart relating the said sum and the said quotient is used to give a figure of merit for the course. Three separate charts for use respectively in "reaching," "beating" and "running" are provided. For setting the required apparent wind, a masthead wind direction discriminator is provided. This comprises a wind vane to be set by the helmsman to a desired apparent wind direction. The vane can oscillate through a limited angle and its movements are integrated electrically and fed to an indicator that enables the helmsman to steer to the required course. Rotors are arranged to deliver signal impulses representing the water speed and the wind speed with respect to the vessel and these signal impulses are delivered to a counting instrument that operates over a predetermined period of time to register the aforesaid quotient.
REFERENCES:
patent: 3804057 (1974-04-01), Toscan
patent: 3814910 (1974-06-01), Palmieri et al.
patent: 3881094 (1975-04-01), Taylor et al.
patent: 3881095 (1975-04-01), Taylor et al.
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