The X-15 flew at such high altitudes that ... but then use them as a prop-aircraft and use its wings for lift. According to ...

However, as shown in a recent Simple Flying article on Saab's general aviation aircraft ... designed to test the applications of propeller engines at high speeds, as jet engines of the day ...

Using electric motors to power airplane propeller engines to lessen pollution. Electric aviation also means fewer ... See electric vehicle. THIS DEFINITION IS FOR PERSONAL USE ONLY.