Measuring and testing – Navigation – Ship's log
Patent
1977-12-29
1978-10-31
Woodiel, Donald O.
Measuring and testing
Navigation
Ship's log
G01C 2110
Patent
active
041227115
ABSTRACT:
A drag force knotmeter for indicating the speed of a boat in water, especially in the range of 1-12 knots is a device attached to the boat by a flexible line and trails an elastomeric line attached to a drag. The drag is a rigid rod having an eye on one end and a circular disk on the other end. Said circular disk being attached to the rod by its center. The drag is heavier-than-water and is attached to the elastomeric line through its eye. System friction is minimized by maintaining an overall straight line configuration from the drag to the point of attachment to the boat. The elastomeric line isolates sudden surges on the drag from the indicator on the knotmeter.
REFERENCES:
patent: 168432 (1875-10-01), Trenchard
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