With its 23 meter wingspan the Quintus M is an entirely new concept. It has been first introduced to experts and visitors at the AERO 2011 by the cooperating partners Lange Aviation and Schempp-Hirth. The main differences between Antares 23E and Quintus M can be found in the fuselage, the outer wings and in their propulsion concepts. While the Quintus M thanks to a 70 hp Solo combustion engine qualifies for self-launching, the Antares 23E comes up with an innovative electric propulsion system. Based on a super elliptical layout, Lange Aviation and Prof. Loek Boermans have jointly designed the inner wings. They used nine different wing airfoils and perfectly harmonized all of them. The laminar flow on the wing’s bottom side reaches up to 95% of the airfoil’s depth, on the upper surface the flow stays laminar until having followed 75% of the wing's contour. The Quintus M’s outer wing has been designed by Schempp-Hirth, supported by Karl-Heinz Horstmann and Jan Himisch who work with the German Aerospace Center (DLR) in Braunschweig. Prof. Mark Maughmer engineered the winglets. Flaperons, respectively ailerons, are following the entire wingspan and therefore provide effective and direct controls. It is also noteworthy, that when the project started in 2011, the certification documentation for the wing was initially created for an agreed upon total weight of non lifting parts (fuselage with pilot and elevator) of 380 kg (838 lb). When this weight proved to be unattainable, refined certification calculations allowed this weight to be elevated to 403 kg (888 lb) in 2013. By 2015 this value had been increased again to cover 403 kg plus a full fuel tank located close to the fuselage in the inner left-hand wing. This is a typical example of that also highly loaded components can have substantial the reserves available.