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A trolling motor is a self-contained marine propulsion unit that includes an electric motor, propeller and control system, and is affixed to an angler's boat, either at the bow or stern. A gasoline-powered outboard used in trolling , if it is not the vessel's primary source of propulsion, may also be referred to as a trolling motor.
Outboard motor shaft lengths are standardized to fit 15-, 20- and 25-inch (38-, 51- and 64-centimeter) transoms. If the shaft is too long it will extend farther into the water than necessary creating drag, which will impair performance and fuel economy. If the shaft is too short, the motor will be prone to ventilation.
The motor size constant ) and motor velocity constant ... The torque on shaft is 0.0053 N⋅m at 2 A because of the assumed radius of the rotor (exactly 1 m).
The whirling frequency of a symmetric cross section of a given length between two points is given by: N = 94.251 E I m L 3 RPM {\displaystyle N=94.251{\sqrt {EI \over mL^{3}}}\ {\text{RPM}}} where: E = Young's modulus, I = second moment of area , m = mass of the shaft, L = length of the shaft between points.
The following stresses are induced in the shafts. Shear stresses due to the transmission of torque (due to torsional load). Bending stresses (tensile or compressive) due to the forces acting upon the machine elements like gears and pulleys as well as the self weight of the shaft. Stresses due to combined torsional and bending loads.
Connecting the motor to the gearbox and propeller were two downtubes, the forward one containing the drive shaft, and the aft tube serving as the exhaust-cum-silencer (which vented underwater). This arrangement meant that the engine could not be rotated 360 degrees to give reverse thrust, as can more modern small outboards.