/ July 19, 2016
(4.3/5) (73)

Description

RC Model Aircraft Center of Gravity Calculatorv3 (replaces v1.x and v2.x)

This app is COMPLETELY free, no ads and no in-app purchases.

Note 1: Please see my RC-E Calculator which includes wingloading, flight time, prop thrust, energy density, current draw andmany other calculators:
Google Play Store Link ► RC E Calc Pro
Note 2: Please email if you have a problem or suggestion
Note 3: This app was built with MIT App Inventor, the permissions*(see below) required are the defaults, I have no control over whatpermissions Google/MIT App Inventor requires an app to have. Thisapp has been published on Google Play for 4 years since 2012 andsince it is still here you can be assured that Google Play has noproblems with it.

--------------------------------------------------------------

This may prevent your plane from crashing!

"A nose-heavy airplane may not fly well, but a tail-heavyairplane may fly only once."

This app will calculate the POSITION of the Center of Gravity(CG or CoG or Balance Point) measured back from the leading edge atthe wing root in the units of your choice.

Enter your measurements for:
- tip chord length,
- root chord length,
- sweep length and
- required CG percentage (eg 28%)

of your model airplane and then the CG, wing area, geometricmean chord and tip-to-root chord ratio will be calculatedautomatically.

You can use inches or centimeters and the result will be in theunits you used (don't mix units though).

A too rearward CG position can cause unrecoverable (potentiallyfatal) instability!

25-35% recommended for most conventional wings, 12-18% for pureflying wings, 15-19% for Delta wings.

This calculator uses the Neutral Point, the AIRCRAFT'Saerodynamic center (AC), as a reference point to calculate the CGrange. It uses a well known, simple but fairly reliable method ofdetermining the CG of a model aircraft.

Thanks for downloading, comments and ratings welcome.

Version history:

V3.01
- improved layout
- new image
- improved wording

V2.3:
- improved layout
- improved images
- new instruction page
- corrected wording

Version 2.2:
- Resize & refit for tablets
- Refit text flow for large numbers
- Center everything
- Minor layout improvement & bug fixes

Version 2.0+: implemented due to Google licensing changes.
- No longer requires a button tap to calculate, calculatesautomatically after the all the fields are filled.
- Added wing Area calculation
- Changed layout for ease of use/visibility
- Fixed small bugs

(*This app requires the following default MIT App Inventorpermissions:

android.permission.INTERNET - to check for updates and so thatthe screen's background image property can be set to the URL of animage on the web if there is a background image
android.permission.WRITE_EXTERNAL_STORAGE - to move the app to EXTSD on your phone if necessary.
android.permission.READ_PHONE_STATE - to check for incoming phonecalls and then hide the app if necessary.
android.permission.READ_EXTERNAL_STORAGE - access the app on EXT SDif necessary.)

App Information CG Calc

  • App Name
    CG Calc
  • Package Name
    appinventor.ai_graham_dyer.CGcalc_v2
  • Updated
    July 19, 2016
  • File Size
    Undefined
  • Requires Android
    Android Varies with device
  • Version
  • Developer
    Graham Dyer
  • Installs
    5,000 - 10,000
  • Price
    Free
  • Category
    Tools
  • Developer
  • Google Play Link

Graham Dyer Show More...

CG Calc APK
Graham Dyer
RC Model Aircraft Center of Gravity Calculatorv3 (replaces v1.x and v2.x)This app is COMPLETELY free, no ads and no in-app purchases.Note 1: Please see my RC-E Calculator which includes wingloading, flight time, prop thrust, energy density, current draw andmany other calculators:Google Play Store Link ► RC E Calc ProNote 2: Please email if you have a problem or suggestionNote 3: This app was built with MIT App Inventor, the permissions*(see below) required are the defaults, I have no control over whatpermissions Google/MIT App Inventor requires an app to have. Thisapp has been published on Google Play for 4 years since 2012 andsince it is still here you can be assured that Google Play has noproblems with it.--------------------------------------------------------------This may prevent your plane from crashing!"A nose-heavy airplane may not fly well, but a tail-heavyairplane may fly only once."This app will calculate the POSITION of the Center of Gravity(CG or CoG or Balance Point) measured back from the leading edge atthe wing root in the units of your choice.Enter your measurements for:- tip chord length,- root chord length,- sweep length and- required CG percentage (eg 28%)of your model airplane and then the CG, wing area, geometricmean chord and tip-to-root chord ratio will be calculatedautomatically.You can use inches or centimeters and the result will be in theunits you used (don't mix units though).A too rearward CG position can cause unrecoverable (potentiallyfatal) instability!25-35% recommended for most conventional wings, 12-18% for pureflying wings, 15-19% for Delta wings.This calculator uses the Neutral Point, the AIRCRAFT'Saerodynamic center (AC), as a reference point to calculate the CGrange. It uses a well known, simple but fairly reliable method ofdetermining the CG of a model aircraft.Thanks for downloading, comments and ratings welcome.Version history:V3.01- improved layout- new image- improved wordingV2.3:- improved layout- improved images- new instruction page- corrected wordingVersion 2.2:- Resize & refit for tablets- Refit text flow for large numbers- Center everything- Minor layout improvement & bug fixesVersion 2.0+: implemented due to Google licensing changes.- No longer requires a button tap to calculate, calculatesautomatically after the all the fields are filled.- Added wing Area calculation- Changed layout for ease of use/visibility- Fixed small bugs(*This app requires the following default MIT App Inventorpermissions:android.permission.INTERNET - to check for updates and so thatthe screen's background image property can be set to the URL of animage on the web if there is a background imageandroid.permission.WRITE_EXTERNAL_STORAGE - to move the app to EXTSD on your phone if necessary.android.permission.READ_PHONE_STATE - to check for incoming phonecalls and then hide the app if necessary.android.permission.READ_EXTERNAL_STORAGE - access the app on EXT SDif necessary.)
RC E-Calc Pro 3.0 APK
Graham Dyer
App by Graham Dyer