An example of an Analysis done on this project:

While designing the drivetrain for the R/C Mini Baja Car the requirements needed to be met, using the R.A.D.D format we were able to satisfy these needs. The main requirement of the drivetrain is the maximum speed requirement, which is written as the max speed of the car must not be less than 20 mph. However, knowing that the chassis was going to be above and beyond that to hopefully win the competition portion of the ASME Baja Competition. With research on competition-based trophy trucks, the gear ratio for maximum acceleration but with allowable torque for jumps and acceleration was found.

   The analysis for this was done by first calculating the maximum RPM that the motor could produce at the pinion drive gear. Knowing the max RPM from the motor, using the gear ratio from the drive gears to find the RPM of the driveshaft. This is then incorporated into another gear reduction at the differential gears. The determined ratio allowed the analysis off the final RPM to the axles. After finding the travel distance of one tire, using width and overall diameter, the final max speed could be calculated. (Appendix A.1).

   With the found max speed, exceeding the requirement, the ratio was then used to find the number of teeth on the drive gears, and the required dimensions were found for those gears (Appendix A.4&5). The main drive gear will be 64T and the pinion drive gear will be 26T.

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Project Requirements:

The Baja Car must meet the ASME RC Baja Race requirements.

• The cost of parts for the Baja car should be limited to $400.

• The Baja Car must reach speed of at least 20 mph.

• The steering assembly will allow the RC car to have a turning radius of 60 degrees.

• Drivetrain must be no higher than 2 inches from the chassis plate.

• Drivetrain must be powered by a 7.2 voltage battery.

• The RC motor must meet ROAR Racing standards.

• Driveshaft must withstand torque produced by motor.

• The R/C Baja Car must accelerate to max speed at a rate of 17.2 ft/s^2.