MOJAVE - Progress on rocket engine technology continues at XCOR Aerospace, as the company this week announced the successful completion of the first round of testing of its new 56-pound thrust rocket engine, the XR-3E17. The new engine is a direct descendant of the company's first "Tea Cart" engine, which debuted in 2000 and has been used as a demonstration model of the company's capabilities. "We needed a more updated engine," said Aleta Jackson, co-founder of the company, which is based at the Mojave Air and Space Port. The new engine provides nearly four times the thrust of the original...