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Is it important to know your prop’s slip? Only if you care about insignificant, little items like thrust.

Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. Slip is not a measure of propeller efficiency. Rather, slip is the difference between actual and theoretical travel resulting from a necessary propeller blade angle of attack. If the blade had no angle of attack, there would be no slip; but, of course, there would be no positive and negative pressure created on the blades and, therefore, there would be no thrust. The Mercury Racing Prop Slip Calculator (below) lets you quickly determine propeller slip.

What’s New

Version 1.8

Upgraded for latest iOS.

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings

bogtracker ,

A Must Have App

For Mercury owners, racers or not, if you’re an enthusiast of propellers and performance, this is a serious tool to have in your bag of tricks. Please download it and try it. Supply the necessary data, and presto, complex calculations delivered easily with no stress.


Great App!

Can get prop slip numbers during the seatrial at each rpm range...very handy!

The Only F'in Man ,

App not working

Have been using this app for a few weeks and works great!! But now access is being denied because it now gives a message that the trial period has expired but allows no way to remedy the issue. Please help!!

App Privacy

The developer, Sukhmeet Soin, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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