Contents

Rubber Motor Calculator

Help Topics:

Overview

Operation

Calibration

List

Printing


Overview

This program was developed to calculate the breaking turns and breaking torque for rubber motors use for toy airplanes.

This program calculates Breaking Turns and Breaking Torque by the cross section area of the rubber.


Operation

To operate this program select the Breaking Turns or Breaking Torque tab. Define a motor with the scroll windows on the left side of the page. Scroll to the value you desire then click it and the selection will turn BLUE. When a selection is changed the new value of turns or torque will be displayed in a window on the right side of the page.

When calculating Breaking Turns if you put a 1 in the Length window the number displayed in the Turns window will be the BREAKING TURNS per INCH. If the number in the Length window is greater than 1 the number displayed in the Turns window will be the total number of turn you can put in the motor.

On the bottom side of each page is a Limit window. This window will allow you to set a Limit for SAFE winding.

On the Breaking Turns and Breaking Torque pages there are CHECKBOXES marked “Sherman”. These CHECKBOXES allow the use of Len Sherman's equations.


Calibration

On the Breaking Turns page and on the Breaking Torque page there is a Calibrate button. Pressing that button will activate a Calibration dialog. The Calibration dialog will allow you to specify a motor Width and Breaking Turns or Breaking Torque.

Pressing the “Use Default” button will restore the original calibration.

Clicking the “Save Value” checkbox will cause the current selection to be saved on the hard drive. It will be used the next time Rubber Motor Calculator is started.


List

The List page will allow the user to build list of motor data. This list may be saved on the hard disk or as a printable file.

Add:

Pushing the Add button under the Breaking Turns or Breaking Torque windows will add the entry to the list.

Delete:

Deleting an item from the list is accomplished by first selecting the item then clicking the Delete button.

Save and SaveAs:

The Save and SaveAs buttons allow you to save the list to the computers hard drive. The SaveAs button allows you to provide your own file name and directory. When the Save button is used to save a file either the default filename “rmc.dta” or the previously used filename is used. These files are normally saved in the application install directory.

Load:

The Load button allows you to select a file to save.  If a file has been saved with the default filename “rmc.dta”  it will be loaded the next time RUBBER MOTOR CALCULATOR is started


Printing

Windows does not allow this type of program to send files directly to the printer. The Print button will format the list for printing and allow you to save tit to a print file.

The PRINT file will be saved in your “My Documents” folder by default. The default filename is “rmc.txt”. You can change the filename and folder. You can then open the file with either NotePad or WordPad and the print the file from that application