Vac-U-Boat's 545 type DC motor for
direct-drive installation in scale boats.
TW103 (bare motor) and TW104 (motor with
leads and caps installed).
This is a new DC 545 type motor manufactured by Johnson
Motor Company for Vac-U-Boat. This is the standard Vac-U-Tow Towboat
motor. 0.125" diameter x 0.53" long smooth shaft. 1.4"
diameter x 2.85" long overall. No load speed of 3,100 RPM at 7.45
volts. No load amp draw of 0.22 amps at 7.45 volts. At stall, 2.54 amps at
7.45 volts. Designed for 13.8 volt automotive use, it can handle
6-volt and 12-volt gel cells.
Epoxy-computer-balanced 5-pole armature has 75 turns of 0.27mm copper
wire. Higher low-speed torque and lower RPM than 3-pole stock motors.
Large bronze oil impregnated bushings. Carbon brushes. One internal
capacitor on the negative terminal. This motor can direct-drive a
1.75" scale prop with cool-quiet performance.
The TW104 includes color-coded 16 gauge 6-1/2"
insulated leads with brass 1/8" bullet terminals insulated with clear
silicone sleeves. One external capacitor is installed. One internal
capacitor is included in the motor.
This motor fits the M121 90-degree, and the M122 80-degree motor
Computer Print-out of Nominal Motor Curves measured at a
constant 24 volts. Courtesy of Johnson Electric Engineering Ltd.
Click the photo to link to a 13K Acrobat File.
Motor Outline. Print-out of motor physical specifications.
(Metric) Courtesy of Johnson Electric Engineering Ltd.