Despite dozens of designs and millions of dollars spent over the decades on engineering a true, usable personal jetpack that could transport someone high into the sky, none have ever gone more than 150 feet above the ground… until now. The Martin Jetpack easily broke 150 feet, going over 20-times that high in a recent test of its new parachute fitting. The test, which used a remote control and a test-dummy, was conducted at a secret location somewhere in Australia. The Martin Jetpack first made news when it was unveiled in America but failed to go higher than 3 feet off the ground. Now, it’s made…