A trolling motor is a self-contained

marine propulsion Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electr ...

unit that includes an

electric motor An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate for ...

, propeller and control system, and is affixed to an

angler Angler may refer to: * A fisherman who uses the fishing technique of angling * ''Angler'' (video game) * The angler, ''Lophius piscatorius'', a monkfish * More generally, any anglerfish in the order Lophiiformes * '' Angler: The Cheney Vice Pres ...

's boat, either at the bow or stern. A gasoline-powered outboard used in

trolling In slang, a troll is a person who posts or makes inflammatory, insincere, digressive, extraneous, or off-topic messages online (such as in social media, a newsgroup, a forum, a chat room, a online video game), or in real life, with the i ...

, if it is not the vessel's primary source of propulsion, may also be referred to as a ''trolling motor.'' The main function of trolling motors is to keep the boat running at a consistent, low speed suitable for

. Trolling motors are often lifted from the water to reduce drag when the boat's primary engine is in operation.

Uses

Trolling In slang, a troll is a person who posts or makes inflammatory, insincere, digressive, extraneous, or off-topic messages online (such as in social media, a newsgroup, a forum, a chat room, a online video game), or in real life, with the i ...

for game fish; a motor used for this purpose is usually a secondary means of propulsion, and mounted on the transom alongside the primary

outboard motor An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. They are the most common motorised method ...

or on a bracket made for the purpose. * Auxiliary power for precision maneuvering of the boat, to enable the angler to cast his bait to where the fish are located. Trolling motors designed for this application are typically mounted in the bow.

History

An 1895 article in ''Scientific American'' entitled "A Portable Electric Propeller for Boats" stated: "Briefly described, it consists of a movable tube which is hinged at the stern of the boat, much as an oar is used in sculling. The tube contains a flexible shaft formed of three coils of phosphor bronze. This tube extends down and out into the water, where it carries a propeller, and at the inboard end an electric Motor is attached, which is itself driven by batteries." It was invented and sold by the Electric Boat company. The electric trolling motor was invented by O.G. Schmidt in 1934 in Fargo, North Dakota, when he took a starter motor from a Ford Model A, added a flexible shaft, and a propeller. Because his manufacturing company was near the Minnesota/North Dakota border, he decided to call the new company Minn Kota. The company still is a major manufacturer of trolling motors.

Design

Electric trolling motors

Diagram of a hand-controlled trolling motor left, Diagram of a foot-controlled trolling motor * Modern electric trolling motors are designed around a 12-volt, 24-volt or 36-volt

brushed DC electric motor A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source and utilizing an electric brush for contact. Brushed motors were the first commercially important application of elect ...

, to take advantage of the availability of 12-volt

deep cycle batteries A deep-cycle battery is a battery designed to be regularly deeply discharged using most of its capacity. The term is traditionally mainly used for lead–acid batteries in the same form factor as automotive batteries; and contrasted with starte ...

designed specifically for marine use. * The motor itself is sealed inside a watertight compartment at the end of the shaft. It is submerged during operation, which prevents overheating. * The propeller is fitted directly on to the

propshaft A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power and torque and rotation, usually used to connect ...

. * Hand-control:

tiller A tiller or till is a lever used to steer a vehicle. The mechanism is primarily used in watercraft, where it is attached to an outboard motor, rudder post or stock to provide leverage in the form of torque for the helmsman to turn the rudder. ...

for steering, with speed control either built into the tiller or a

control knob {{more citations needed, date=January 2017 A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresp ...

on top of the unit. Hand controlled trolling motors are attached to the boat with a clamp. * Foot-control: on/off and speed controls are foot-operated, and built into a pedal that also controls the steering mechanism. Steering may be via electronically controlled

servo motors A servomotor (or servo motor) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also ...

, or in early-model (and late-model low-end units), a push-pull cable. Foot controlled trolling motors require a specialized mounting bracket that bolts horizontally to the deck. Main advantage of foot controls is that fisherman has both hands free for fishing and landing the hooked fish. On the other hand, it is sometimes hard to coordinate foot work with hands, especially in wavy and windy conditions. * Wireless remote: available on high-end late-model trolling motors. Servo-controlled steering and speed control both respond to a wireless device, either in a foot pedal or a key-fob transmitter (similar to an automotive

remote keyless system A remote keyless system (RKS), also known as keyless entry or remote central locking, is an electronic lock that controls access to a building or vehicle by using an electronic remote control (activated by a handheld device or automatically by ...

Gasoline-powered trolling motors

* Small outboard motors are frequently used as trolling motors on boats with much larger engines that do not operate as efficiently or quietly at trolling speeds. These typically are designed with a manual pull start system, throttle and gearshift controls mounted on the body of the motor, and a tiller for steering, but in a trolling application, will be connected to the steering mechanism at the

helm Helm may refer to: Common meanings * a ship's steering mechanism; see tiller and ship's wheel * another term for helmsman * an archaic term for a helmet, used as armor Arts and entertainment * Matt Helm, a character created by Donald Hamilton * ...

References

External links

* {{Commonscat-inline, Trolling motors Marine engines Marine propulsion