Troll meter

Details Troll meter Troll meter

1984-04-12

1985-10-22

Woodieu, Donald O.

Measuring and testing

Navigation

Ship's log

73187, G01C 2110

Patent

active

045480737

ABSTRACT:
This troll meter is used to determine the speed of a boat in the range of one to three knots. Primarily, it consists of a shaft having three marked and different pitched propellers, which are rotated by the forward speed of the boat, and each is freely and rotatably received on shaft 11.

REFERENCES:
patent: 93513 (1869-08-01), Banare

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