The Headspeed Tachometer is a handy tool for measuring the speed of your helicopter. The app was developed to work with electric and nitro helis.

The app works as follows:

First, the user has to set an estimated speed. This can be done by using the settings, or by using the default settings. The default settings are suitable for most common helis.

After that, the user has to place the phone on the ground and press the "Measure" button.

The app will analyze the sound of the blades and the speed will be calculated and displayed.

To get the most accurate results, the user should follow the instructions given in the app.

The user has to make sure that the phone is not moving, and is not in a very loud environment.