RC Model Aircraft Center of Gravity Calculator v2.2 (replaces v1.x)
Note 1: please email if you have a problem or suggestion
Note 2: This app was built with MIT App Inventor, the permissions required are the defaults, I have no control over what permissions Google/MIT App Inventor requires an app to have.
This may prevent your plane from crashing!
Measure and enter the tip chord length, the root chord length, the sweep length and YOUR required CG percentage (eg 25%) of your model airplane wing.
This app will calculate the POSITION of the Center of Gravity (CG or CoG or Balance Point) measured back from the leading edge at the wing root.
You can use inches, centimeters or millimeters.
A too rearward CG position can cause unrecoverable (sometimes fatal) instability!
25-30% recommended for most conventional wings, 12-18% for delta wings.
Please see also my RC-E Calculator which includes wing loading, flight time, prop thrust and other calculators:
► RC E Calc Pro
(This app requires the following permissions:
android.permission.INTERNET - to check for updates and so that the screen's background image property can be set to the URL of an image on the web if there is a background image
android.permission.WRITE_EXTERNAL_STORAGE - to move the app to EXT SD on your phone if neccessary.
android.permission.READ_PHONE_STATE - to check for incoming phone calls and then hide the app if neccessary.
android.permission.READ_EXTERNAL_STORAGE - access the app on EXT SD if neccessary.)
Version 2.0: implemented due to Google licencing changes.
* No longer requires a button tap to calculate, calculates automatically after the all the fields are filled.
* Added wing Area calculation
* Changed layout for ease of use and visibility
* Fixed small bugs
* Resize & refit for tablets
* Refit text flow for large numbers
* Center everything
* Minor layout improvement and bug fixes