Stemme’s S10 is one of the truly remarkable combinations of power and glide. The big-winged aircraft has a 50:1 sink rate. The mid-engine-front propeller drive was somewhat of an evolutionary moment for motorgliders and has set a number of world records. The two-seater has carbon-fiber wings and solar panels for 30W of electrical power once airborne. Power comes from Rotax 914 and Stemme offers both a normally aspirated and a turbocharged model.