RocketCalc is a graphical calculator for determine the altitude and velocity a model rocket is likely to achieve. Enter into RocketCalc the parameters of your model rocket and rocket engine. RocketCalc will then display the likely flight profile. You can tap on the RocketCalc flight profile screen to find the altitude and velocity at any particular time during the rockets flight. Default values are for a B6 rocket engine.

Select the Results menu item to display values for maximum velocity and maximum altitude and other key measurements.

You can also find the time of maximum altitude of your model rocket and the amount of time the rocket will coast. This allows you to select a rocket engine with a delay before ejection charge so that the parachute doesn't deploy too early or too late.

If you don't like advertisements, or if you want to save and reopen your favorite sets of rocket parameters, you can purchase the (No Ads) version.

If you discover any bugs or have any suggestions, please email them to terakuhn@gmail.com with 'RocketCalc' in the title of your email.

// Option A //

To download RocketCalc mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download RocketCalc mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download RocketCalc from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search RocketCalc in HappyMod App.