Over the last few years, engineers at GE Aviation have been teaching new tricks to a workhorse turboprop engine designed to power planes that can fly through the harsh Siberian winter or the hot Saharan desert. Now with an upgraded lubrication system that keeps the oil flowing even at zero-gravity conditions, the new H75-100 turboprop engine can finally have some fun. It has started out by powering the zippy Dart 550, the just-released aerobatic plane from Austria’s Diamond Aircraft that’s destined to fly the entire suite of unusual all-attitude maneuvers.