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Cover Market Story Watch THE FUTURE VERSION OF SPORTSTAR Sportstar EPOS TThe electric aviation project Pure Flight from the Czech Republic will celebrate its premiere at the AERO and the 2018 e-flight-expo. At the fair, the project will present the electric aircraft EPOS, an electric version of the Sportstar from the manufacturer of Evektor. Evektor was one of the first companies to set up an electric version of its Sportstar model more than three years ago. Because of the well-known weight problem, Evektor chose the EPOS electric version to comply with not the UL but the LSA standard, which weighs 600 kg. The higher takeoff weight offered the option of higher battery payload and associated longer flight time. The sports star EPOS was one of the first electrified ULs. The motor drive unit (below) is from MGM Compro ELSA-THE CZECH APPROACH Evektor was fortunate that the company is based in the Czech Republic, because the local UL association LAA, which - as in Germany DAeC and DULV - on behalf of the government manages the ultralight, anticipated the 600-kg UL class back in 2011, and set up a national experimental class with 600 kg takeoff weight called ELSA. This class is currently limited only to the Czech Republic, but it could be a key advantage in the electric aircraft, because today with the Phoenix, the EPOS and the SL400 E there are already three e-planes in this class which are approved. Since the approval is based on UL approval and the approval requirement is based on the ASTM rules, it will probably be possible to adopt these machines in the new 600 kg UL category as soon as it is established. The EPOS project goes back to an initiative of the company Evektor, which also obtained support from the Czech Republic Technology Promotion AG TACR. The RE REB 90-5 liquid-cooled motor, as with most Czech projects, comes from the manufacturer Rotex, the engine and battery control unit are from MGM Compro. The aircraft can be equipped with two battery units with two batteries each. Each individual battery consists of 45 lithium-polymer cells. The motor control pilot interface was developed by Brno University of Technology together with AEROworks. The engine has a peak output of 100 hp and a continuous output of 75 hp and 12 e Flight Journal 1 / 2018

Market Watch can therefore be in comparison of performance with the normally installed Rotax 912S, so that the flight performance is similar to those of the version with internal combustion engine. In the construction it has also thought of the operation and the battery storage. An integrated charger makes it possible to „recharge“ on a standard 220 V connection. Charging via an external device with 400 volts, the charging time can be reduced by 50%. The flight time with the maximum possible four batteries is one hour. The machine flew for the first time in March 2013, making it one of the first ULs that has been converted to an electric drive. Unfortunately, the development is currently stalled, because the company sees no market for mass production. But in the advent of the 600 kg UL regulation in many European countries, the situation could be changed, especially since in the battery sector since 2013 has improved a lot and thus today a significantly longer flight duration is possible. 4 TECHNICAL SPECIFICATIONS: • Maximum speed: 260 km / h (cruising at 160 km / h) • Maximum take-off weight: 600 kg • Empty weight of the aircraft: 285 kg (without batteries) • Engine: Rotex Electric, RE REB (liquid cooled) 100hp • Propeller: VZLU 3blade (composite) 1.6 m diameter • Motor controller: MGM COMPRO HBC 400400, • Max. Voltage peaks: 300 A • Aviation Battery Management System: MGM COMPRO • Battery Pack: Kokam 80 Ah, 90 S • Balanced charger 6 KW: MGM COMPRO 1 / 2018 e Flight Journal 13

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