Last week, I went to the EAA (Experimental Aircraft Association) in Oshkosh, Wisconsin. It's an amazing air show that happens every year. Three of these pictures are self explanatory. The one of the sailplane on the ground with a retractable pusher prop mounted behind the cockpit is powered by a battery driven electric motor. The battery power gets it up in the air. Then the prop retracts into the fuselage and the plane becomes a soaring sailplane.
