The sharp end of the stick: The spring-loaded, two-blade propeller lives stowed inside the nose bowl when flying the Stemme as a glider, and opens centrifugally when you crank the engine for powered flight. Here the nose has been moved forward four inches for preflight inspection of the prop and engine start. See the Stemme website for more info: http://www.stemme.de/daten/e/innovationen/welleprop.htm