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TruAirspeed

TruAirspeed

by James Petty

8 ratings
7 reviews
🔧 Utilities
Free

Details

  • Released
  • Updated
  • April 14, 2014
  • July 8, 2025

Features

Developer

James Petty
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ipad
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About

This utility calculates true airspeed, pressure altitude, density altitude, and Mach number. It accounts for compressibility effects and offers unit choices and keypad styles. Users can also input a correction factor for their airspeed indicator.

✓True airspeed calculation
✓Pressure and density altitude calculation
✓Mach number calculation
✓Compressibility effects accounted for
✓Choice of input/result units
✓Calculator or telephone keypad options
✓Airspeed indicator correction factor
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What's New in TruAirspeed

2.1

July 8, 2025

Due to changes in the iPad coding environment, I've had to make some major "under the hood" changes to TruAirspeed. While its appearance on iPads has changed a bit, features and functionality are unaffected. Following a user's suggestion, I've also enlarged the main screen layout on iPads for better usability when flying. I've also updated the app for operation under iOS18 and iPadOS18, and for compatibility with all current iPhone and iPad models.

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User reviews

Most RecentHighest RatedLowest Rated

How do u change to mph

I can’t find how to change knots to miles per hour which my airspeed indicator is calibrated in?
tom3holertom3holer

Well Done

Thank you. Both of your apps are absolutely perfect. Thank you.
ECPilotECPilot

Works as stated. Generous contributor to the flight testing and experimental community.

Another useful offering by Mr. Petty. Thank you sir. I’m enjoying tinkering with Benchmark too. As for the one user saying there is no way to change units; there is. Tap the little “i” in the corner and drill down. As for the other claiming the app is inaccurate, if you mix up C and F, you get a big error (10 knots on a sample I just did).
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mesaemesae

Incorrect compared to other calculators

Off by between 5-10 kts. Not reliable
jack22378888jack22378888

No way to choose between F and C?

Is there really no way to change between Celsius and Fahrenheit? That makes it so you need another app to convert temperature. Am I missing something? This seems like a major oversight.
hish747hish747
See 2 more reviews

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FAQ

What is TruAirspeed used for?

TruAirspeed is a utility designed to calculate true airspeed, pressure altitude, density altitude, and Mach number. It is particularly useful for pilots who need to understand these critical flight parameters.

How accurate are TruAirspeed's calculations?

The calculations in TruAirspeed take full account of compressibility effects for subsonic, non-transonic flight. It does not account for shock waves, limiting its use to these flight regimes.

Can I customize the units in TruAirspeed?

Yes, TruAirspeed offers a choice of units for both inputs and results. This allows users to tailor the app to their specific preferences and operational needs.

Does TruAirspeed have ads?

No, TruAirspeed does not contain advertisements. It is a free application that provides its core functionality without interruption.

What devices is TruAirspeed compatible with?

TruAirspeed is available for iPhone, iPad, and iPod touch devices. It is designed to run on Apple's mobile operating systems.

How often is TruAirspeed updated?

The latest version of TruAirspeed is 2.1, which was last updated on July 8, 2025. This indicates active development and maintenance of the application.

What is the age rating for TruAirspeed?

TruAirspeed has an age rating of 4+. This suggests that the content and functionality of the app are considered appropriate for users aged four and older.

Can I input a correction factor for my airspeed indicator in TruAirspeed?

Yes, TruAirspeed allows you to set a correction factor for your aircraft's airspeed indicator or pitot-static system if you know it. This helps to improve the accuracy of the calculations.