Downsizing and performance improvement was done. It can climb the slope of 10 deg. gradient with no help. On a horizontal plane, it reaches 360 to 400 rpm and it can start engine without the starter. (There are no motors/hinges except the starter's and so on.)
up / down arrow key: +/- power (close/open stators)
left arrow key: brake
right arrow key: run starter (optional)