"Prototype engine weighs about 15 kilograms" "EmDrive, produced 91 micronewtons of thrust for 17 watts of power" http://www.wolframalpha.com/input/?i=91+micro

"Prototype engine weighs about 15 kilograms" "EmDrive, produced 91 micronewtons of thrust for 17 watts of power" http://www.wolframalpha.com/input/?i=91+micronewtons+*+1+year+%2F+15+kg+in+mph http://www.wolframalpha.com/input/?i=91+micronewtons+*+1+yea... 428 miles per hour, after a year. Am I doing the math wrong?