What is Chernikeff (Impeller) Speed Log?

Chernikeff Log is a type of Speed Log which is used to measure the speed of a ship.

Features of Impeller Log:

  • Impeller (a small propeller) fitted in a tube.
  • Tube retracted into the hull when not required
  • Impeller rotates when ship moves through water.
  • Rotation of the impeller is converted into electric pulses.
  • Higher the speed, faster the rotation of the impeller, more the number of pulses.
  • The electric pulses are processed and show speed on an indicator on the bridge.