Propulsion engineers design, build and test the drive systems of a spacecraft. Booster systems engineers design, build and test the rockets used to launch missiles or space vehicles. Automotive engine technicians help automotive engineers design, develop, maintain and repair automotive equipment. CAD stands for computer-aided design. CAM stands for computer-aided manufacturing.
Electromechanical technicians build, test, adjust and repair electromechanical devices.
An electromechanical device is one in which electronic sensors activate a mechanical operation. Test drivers do trial runs of a newly designed or modified vehicle to assess its performance capabilities. Service technicians troubleshoot and fix any problems that may prevent an engine from performing to specification. Product development technicians prepare engines and related equipment for testing. Fuel Researchers test new types of fuel and methods of burning them more efficiently.