E-ROP is a multi-party program using an Antares self-launching sailplane. FES and Adventec have crafted a hybrid version of the Antares 20e with a front electric sustainer (FES) motor in place of its tall mast-mounted motor. An incremental program, E-ROP begins by replacing the retractable unit with an FES motor on the nose. This reduces the drag created by the motor being raised into position and simplifies operation. The FES Antares flew for the first time on April 19 with Klaus Ohlmann at the helm. Ulrich Bronet recorded this short video. Under development since 2016, E-ROP will benefit from an advanced battery package from research partner AdvanTec GmbH. According to the project, “The concept provides for batteries in the fuselage and wings, which have an energy capacity of 22 [kilowatt-hours] at a total take-off weight of 650 [kilograms] (1,433 pounds) MTOM (Maximum Take Off Mass).” 22 kWh is about one-fifth of a Tesla battery package and will allow up to 450 …