If you’ve ever fooled around with a gravity knife, you can imagine the eureka moment Dr. Reiner Stemme likely experienced while trying to develop a motorglider providing both uncompromising soaring and outstanding powered performance. Imagine a prop’s blade rather than a knife’s flicking out from the handle, and you’ll understand how a propeller that looks like it’s too big to fit pops out of the nose of the Stemme S10. It’s the high-performance motorglider that Dr. Stemme quit his day job as a laser physicist to create. The patented breakthrough allows the S10 to switch between powered and unpowered flight in seconds with no aerodynamic penalty or change in the aircraft’s center of gravity.
Become a Plane & Pilot Member to explore our complete range of flight reports, technique articles, gear reviews and aviation buyer’s guides written by our experts.