SportStar EPOS+

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

Powerplant of the SportStar EPOS+

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, 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.

Deatil of SportStar EPOS+

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.


Simplified Engine Control

The power unit control is very intuitive - only one control lever moving forwards and backwards. There is no need to adjust mixture richness and monitor cylinder head temperature as in 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 the digital dashboard display, developed by the team at the Faculty of Information Technology at the Brno University of Technology.

SportStar EPOS+ in flight

Low Costs of Operation

Operating costs of electric aircrafts are significantly lower than costs associated with aircrafts equipped with internal combustion engines. The cost of "fuel" itself is 75% lower. Further cost reduction is made possible by the 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.

Detail of electromotor

Integrated Charging Electronics

The installed rechargeable electronic unit enables battery charging in the aircraft itself by using the current from a regular electrical outlet (220 V, 50 - 60 Hz). If the aircraft batteries are charged by using the external charging station from a 400 V electrical network, it is possible to accelerate battery charging by 50%. The charging process is fully automated and optimized to maintain long battery life.

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.

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

Technical Specification

Manufacturer Rotex electric
Model RE BB 90-5, electric motor, brushless, DC, liquid cooled
Nominal power 100 hp
Maximum speed 3,000 rpm
Weight 42 lbs (20 kg)
Manufacturer VZLÚ, a.s.
Model V332-3A1
Type 3-blade, composite
Diameter 64 in (1.625 m)
Engine control unit
Manufacturer MGM COMPRO
Model HBC-SERIES V7, 300400/EPOS1
Max. continuous current 300 A
Max. supply voltage 400 V
Maximum speed 140 KIAS
Cruise speed 92 KIAS
Stall speed 39 KIAS
Endurance (2 + 2 battery containers) cca  1 hour
Battery container
Type of cells SLPB100216216H
Manufacturer Kokam Co., Ltd.
No. of cells in the container 45 cells connected in series
Max. voltage 378 V
No. of containers 2 + 2
Airplane dimensions
Wing span 34.32 ft (10.462 m)
Length 19.6 ft (5.980 m)
Height 8.12 ft (2.476 m)
Maximum take-off weight 1,323 lbs (600 kg)
Empty weights (withouth battery containers) 628 lbs (285 kg)
Max. baggage weight 33 lbs (15 kg)
Weight of one battery container 17 lbs (53 kg)

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