## Welcome to Drive Calculator 3.3

Drive Calculator is a tool that can be used for DC motor analysis and as an aid in the selection of the complete power system for electrically powered model aircraft. Purchasers of commercially available products can use the program to help guide them to a suggested combination of power system components for a given model aircraft. The program can also help DIY (do-it-yourself) motor builders optimize the results of their work.

The application comes with a SQL database that contains separate tables for motors and drive configurations, batteries, ESCs, gearboxes, propellers and stators. You may add components' specifications and measurement data to the database, and you may share that new data with other users and receive database updates via the online data exchange.

I warmly recommend studying the manual to make the best possible use of the software.

### New in version 3.31:

I have removed the code for the conversion of old database files. Windows and Mac users may use DB2CSV in case they still have old files waiting for conversion.

The Mac version for PPC and for i86 are now combined in a single fat binary.

Fixed a bug in the update function. Submitted motors will no longer be duplicated by the online update.

Changing Imax in the motor dialog now correctly results in new computation.

I have made a minor improvement in the analysis of measured motor data.

With some Linux distributions the pull-down menus are displayed incorrectly. In such case you may use the included shell script, which installs a suitable GTK theme, to launch the application. Simply click on 'drivecalc' instead of 'DriveCalculator'.

Update 3.311: Minor bugfix in update function. Linux version only: Combo box behavior fixed.

Please send comments and error reports to christian@drivecalc.de

Regards
Christian Persson

Hannover, in February 2008