Headspeed Tachometer is used to measure the headspeed of your r/c-helicopter.The sound of the blades will be analyzed and the according headspeed will be calculated.Using Settings you can choose between standard (rpm up to 4000) and micro sized (rpm up to 8000) helicopter and setup the number of blades between 2 and 5.Before starting the measuring you have to set an estimated headspeed. You can expect most accurate measurings if set inside the range of +/- 500rpm to your real headspeed.Works with electric and nitro helis without changing any settings.For best results please follow these instructions:Make sure you have not too much side noise like strong wind.After setting an estimated headspeed place your phone on the ground 1-2m from your helicopter.Press the "Measure headspeed" button and walk to a save distance.Spool up the helicopter to your desired headspeed and wait about 20 seconds.After the blades have come to a stop retrieve your phone and press the "Stop measuring" button.Now you can read the headspeeds during the measuring.You can save the result to the log history using the menu option. If you enable the option "Save log automatically" logs will be saved automatically after finishing measuring.Touch a log entry in the log history to view saved results. Long touch a log entry to send the entry or delete it.Use log menu to send complete log history.We want to increase accuracy and compatibility of this App. So please help us and send feeback to [email protected]Please supply information about the phone and helicopters you measured the headspeed.If you have any problems measuring correct headspeed please contact us at [email protected]We will give you instruction about how to enable debug mode. This mode will write data to your SD card which can help us find a solution. Tested by developer:Phones: HTC Desire and Desire SHelicopters: Align T-Rex 500, T-Rex 600, T-Rex 700E, T-Rex 700N, Blade mCPXTested by users:Phones: HTC HD2, Motorola Defy and Droid X, Samsung MesmerizeHelicopters: Mikado Logo 600, 600SE and 400SE, Align T-Rex 450, Concept Notos 500, Walkera 4G6 and M120D01, MSH Protos and Mini ProtosRequired permissions:- Record audio: Needed to record audio from your mic.- Modify/delete USB storage contents modify/delete SD card contents: Needed for debug modev1.0.1: Touch at rpm bar of log to display exact value.v1.0.1: Debug mode (please contact us at [email protected] about how to enable debug mode).v1.0.2: Improved algorithm and increased rpm search range.v1.0.3: Dynamic adjustment of log rpm bar size.v1.0.4: Prevent orientation change during measuring.v1.0.5: Preserve measured data during orientation change.v1.0.6: Successful license check is valid for one week to use the app on the field without internet access.v1.0.7: Support for micro sized helicopters.v1.0.8: Minor improvement for license check.v1.0.9: Log added.v1.0.10: Rename of Logentries. Sending of all measured data. Scrolling of measured data by swiping left or right.v1.1.0: Scrolling of measured data by tap on arrow.v1.1.1: Tap on log bar displays rpm in bigger letters.v1.1.2: Fallback for device not supporting default audio format.v1.1.4: Experimental low RPM mode.v1.2.1: Android Lollipop