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23 Saving and retrieving aircraft data Once you have entered the physical properties for the aircraft, they can be saved and recovered for subsequent runs. The file in which they are saved has the root name plus the extension .CML, and it retains a record of each stability analysis associated with a given .IN file name. Each record is identified by the time and date of its creation. CML files are managed in the area headed File Management at the lower right hand corner of the stability dialog. If the Auto save box is checked, records are saved automatically each time a calculation is performed, but you can also force a save at any time by clicking on the Save data button. To re-load data entered earlier and saved in the CML file, click on the button marked List stability runs, select a date and time, and click on Load Data. To delete data for a certain run, select that run and click on Delete Data. To load data from a CML file having a name different from the current input file, click Import Data. Select the file name and then proceed as above. Flight conditions At the upper right corner of the main form, enter the true airspeed and the density of the medium. Remember to keep units consistent; if the model is dimensioned in inches, speed should be expressed in inches per second. Identifying the stabilizer Click on the button labeled Pitch in the Stability Modes area to bring up the setup dialog for pitch stability.