voltage measurement tool

I don't get enough power from my thruster - what can be the reason?

The most common reasons for not getting enough power out of your thrusters are:

  • Low voltage to the motor. The thruster shall deliver the declared thrust when operating at 10.5 Volts. If the distance between the battery and the thruster is long, if the battery is old or if the battery cables are too thin, it is usual to have less than 10.5V at the motor.
    • Measure the voltage directly at the motor
    • Consider installing a dedicated thruster battery close to the thruster or increase the cable dimensions if low voltage.
  • The efficiency is reduced by marine growth on the propeller, gear leg, or in the tunnel. Check that the gear leg, tunnel, and propeller are free of growth and apply antifouling.
  • Cavitation means that the thruster draws air which extremely damaging for thrust. Read more below on how to reduce cavitation.
    • Consider upgrading to a PRO thruster system (all Sleipners thrusters can be upgraded). This allows you to use the thruster at variable speed and gradually increase the thrust, significantly reducing the risk of cavitation.
    • If you have an old propeller, consider upgrading to the Q-prop, which is designed to remove cavitation (and noise) as it reduces pulsing between the propeller blades and the gear leg, which can create noise and cavitation.
    • Verify that there are no sharp edges on the tunnel thrusters.

      You can watch this video that shows the difference o a rounded edge of a tunnel and sharp tunnel edges.