SportStar EPOS+ - an Electric Airplane powered by 100 hp electric motor

The SportStar EPOS+ represents a concept of sport aircraft of the future - driven by an electric motor, environment friendly, with low costs of operation and maintenance. The original power unit represents the top of performance series of drives which are designed for gliders, motorized Rogallo wings or powered paragliding (among others).

Cooperating companies

Logo Evektor

Project leader and coordinator

Logo Rotex Electric

Manufacturer of the electric motor


Propeller manufacturer

Logo MGM compro

Manufacturer of the Engine control unit

Logo Aeroworks

Supplier of the Engine parameters  display

Logo LAA

SportStar EPOS+ airplane complies with ELSA rules developed by the Light Aircraft Association of the Czech Republic and ASTM F2840-11.


Project No. TA01030821 "EPOS" is designed with the financial
support of TA ČR.

Unique Design of the Power Unit

The power unit is a compact and more efficient DC electric motor RE BB 90-5 with increased power to 100 hp developed by the company Rotex Electric, which directly drives the three-blade composite propeller manufactured by VZLÚ Prague. Engine performance is controlled by an electronic control unit, developed by MGM COMPRO company, which ensures optimal use of the energy stored in the battery containers. The aircraft can be equipped with two pairs of containers - each container includes 45 lithium polymer cells connected in series.

Integrated Charging Electronics

The installed charging electronics enables to charge the batteries directly on the aircraft using current from a regular electrical outlet (220 V, 50 - 60 Hz). If the aircraft batteries are charged by using the external charging station from 400 V electrical network, it is possible to accelerate battery charging by 50%. The charging process is fully automated and optimized to keep high service life of batteries. Discharged batteries can be also quickly replaced with fully charged ones.

Simplified Engine Control

The power unit control is very intuitive - only one control lever moving forward and backward. There is no need to adjust mixture richness and monitor cylinder head temperature as in the airplanes with combustion engines. The control unit is responsible for optimum engine operation, battery status and the entire power system. All necessary information is shown on digital display, developed by the team at Faculty of Information Technology of Brno University of Technology, located at instrument panel.

Environmentally Friendly

Due to the electric power unit, the airplane does not produce any emissions and no manipulation with substances that could endanger the environment (especially fuel or engine oil) is necessary. Furthermore, noise associated with the operation of the aircraft is significantly reduced, allowing the use of airports near populated areas without local residents being disturbed by excessive noise. Last but not least, comfort of the crew members has also been increased.

Low Costs of Operation and Maintenance

Operating costs of electric aircraft are incomparably lower than the costs associated with airplanes equipped with internal combustion engines. Only the cost of the "fuel" itself is 75% lower. Further cost reduction is made possible by a simple and compact construction of the power unit - the number of components of the electric drive is almost 90% lower and maintenance costs are thus significantly reduced.

Further Possibilities of Application

Know-how gained during the development of SportStar EPOS is not limited only to the use of electric drive for this particular airplane. The power unit is designed to allow its modification for use in other types of aircraft.

Technical Specification

Manufacturer Rotex Electric
Model RE BB 90-5, electric motor, brushless, DC, liquid cooled
Nominal power 75 kW (100 hp)
Maximum speed 3 000 rpm
Weight 20 kg (42 lbs)
Manufacturer VZLÚ, a.s.
Model V332-3A1
Type 3-blade, composite
Diameter 1.625 m (64 in)
Engine control unit
Manufacturer MGM COMPRO
Model HBC-SERIES V7, 300400/EPOS1
Max. continuous power 300 A
Max. supply voltage 400 V
Battery Container
Type of cells SLPB100216216H
Manufacturer of cells Kokam Co., Ltd.
No. of cells in the container 45 cells connected in series
Max. voltage 378 V
No. of containers 2 + 2
Wing span 10.462 m (34.32 ft)
Length 5.980 m (19.6 ft)
Height 2.476 m (8.12 ft)
Max. take-off weight 600 kg (1,323 lbs)
Empty weights (withouth battery containers) 285 kg (628 lbs)
Max. baggage weight 15 kg (33 lbs)
Weight of one battery container  53 kg (117 lbs)
Maximum speed 260 km/h IAS (140 KIAS)
Cruise speed 170 km/h IAS (92 KIAS)
Stall speed 73 km/h IAS (39 KIAS)
Endurance (2 + 2 battery containers) cca  1 hour

Photo gallery

Power unit of the SportStar EPOS+: 100 hp electric motor Power unit of the SportStar EPOS Detail of the electric motor SportStar EPOS SportStar EPOS SportStar EPOS SportStar EPOS in flight SportStar EPOS in flight SportStar EPOS in flight SportStar EPOS in flight SportStar EPOS in flight SportStar EPOS in flight SportStar EPOS in flight


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