TruAirspeed vs Flight Times Recorder

TruAirspeed is a True Airspeed Calculator for the iPhone and iPad. It's a bit different from other true airspeed calculators, in which the pressure altitude is an input. This requires resetting the altimeter to the standard sea level pressure of 29.92"Hg to read the pressure altitude. With TruAirspeed, you input the indicated altitude and the Kollsman window's pressure setting — the app then calculates the pressure altitude, density altitude, true airspeed and mach number for you. The calculations involved take full account of compressibility effects, but not shock waves, so it's limited to subsonic, non-transonic flight only. You have a choice of units for inputs and results, and you may choose either a calculator-style keypad (top row: 7-8-9) or a telephone-style keypad (top row: 1-2-3). You may also set a correction factor for your bird's airspeed indicator/pitot-static system, if you know it (mine is 0.95).

Minimize distraction when recording your flight times! Enter tach or hobbs times, simply tap to record off block and on block times, and manually or automatically record your airborne times. Easily keep count of your full stop landings, touch & goes, and go-arounds. The app keeps a history of your flights, which can be exported to a CSV file. Times may be shown and exported in either local time or UTC/zulu. Automatic takeoff and landing time detection is based on a ground speed which may be adjusted based on your aircraft's takeoff and landing speeds, and change in altitude. Recorded times may be shown as rounded to nearest 1 minute, 5 minutes, or tenth of an hour. Supports Apple Watch, where a simple tap on your watch starts and stops recording. Recorded times are synchronized across devices using iCloud. Any time pair may be entered - for e.g., glider flights, only airborne times are recorded.