DataTach Prop Slip

Portable Test Kit

Take this portable test kit on test runs when preparing for a race or a poker run. The test kit provides quick and easy hook-up of the DataTach™ Prop Slip™ by packaging it in a convenient waterproof case. With built-in GPS and power supply you can take this kit anywhere. Just give the DataTach™ some info on your boat and you’re ready to go.

  • Tach signal
  • Propeller pitch
  • drive ratio
  • and tach pulses per revolution

Portable Test Kit includes:

  • gauge
  • GPS antenna
  • memory card
  • USB reader
  • AC adapter
  • DC adapter
  • harness connections to tachs
  • instruction booklet
  • Part Number: PSPTK

There is one Portable Test Kit available, please visit the Closeout webpage for pricing.

The Basics

What is Prop Slip?

Pitch is the distance the boat travels through the water in one complete turn of the propeller. Every inch of the boat that is in contact with the water induces drag. Therefore the distance traveled is not always the same. This results in the propeller “slipping” behind the theoretical distance it should travel with each rotation. The difference between theory and reality is called "propeller slip".

How it works

The DataTach™ Prop Slip™ has a computer that receives GPS speed and RPM info and calculates the slip of your boat's propeller 5 times per second.
A lower prop slip % = better performance

Slip forula

Factors that affect
prop slip:

  • trim angle
  • propeller size
  • pitch of propeller
  • weight distribution
  • jack plate mounting
  • condition of propeller
  • engine mounting height
  • condition of boat bottom
Livorsi Marine Inc. The # Choice in Performance Boating!