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).
Project leader and coordinator
Manufacturer of the electric motor
Manufacturer of the Engine control unit
Supplier of the Engine parameters display
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.
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.
||RE BB 90-5, electric motor, brushless, DC, liquid cooled
||75 kW (100 hp)
||3 000 rpm
||20 kg (42 lbs)
||1.625 m (64 in)
|Engine control unit|
||HBC-SERIES V7, 300400/EPOS1
|Max. continuous power
|Max. supply voltage
|Type of cells
|Manufacturer of cells
||Kokam Co., Ltd.
|No. of cells in the container
||45 cells connected in series
|No. of containers
||2 + 2
||10.462 m (34.32 ft)
||5.980 m (19.6 ft)
||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)
||260 km/h IAS (140 KIAS)
||170 km/h IAS (92 KIAS)
||73 km/h IAS (39 KIAS)
|Endurance (2 + 2 battery containers)
||cca 1 hour