The two aircraft share a common wing design and the companies have agreed to coordinate marketing.

The 18m inner section of the wing was developed by Lange with the assistance of Professor Loek Boermans of the Delft University of Technology.

The biggest differences between Antares 23 E and Quintus are the fuselages and the propulsion units.

Lange Aviation have installed an electric system whereas the Quintus has a SOLO 2625-02i combustion engine.

At 58 kg/m2 the Quintus has a wing-loading 20% higher than its predecessors and its high aspect ratio will give good climb rates in thermals.