Propeller Calc vs BalanceVision

This calculator can determine pitch, gear ratio, RPM, propeller slip and speed parameters. Enter any four variables, and it will calculate the fifth. Use the toggle switch to choose which field to calculate. Pitch is the theoretical forward movement for one complete turn of the propeller. Every inch of the boat in contact with the water induces drag. Therefore, the distance travelled differs since the propeller is "slipping" behind the theoretical distance it should travel with each rotation. The difference between theory and reality is called slip. Depending on your application, slip typically ranges between 5% and 20%. A lower number is only sometimes what you are after. Slip of a prop changes with operating conditions and is not a direct measure of efficiency. Please consult professionals for guidance. Happy powerboating

BalanceVision was designed as a support tool for machine rotor balancing procedures. The App uses the camera feature of the iPhone, iPod or iPad to help the user find the exact angular location where the trial or correction weights should be mounted in the rotor. These angles can be obtained with other of our apps, such as: iRotorBalance & iRotorBalancer; or any field balancing device.