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Sky Power GmbH

Heavy-Fuel Engines for Unmanned Aerial Systems and Vehicles

Sky Power GmbH, manufacturer of two-stroke gas engines, develops and patents next-generation heavy-fuel (HF) engines for unmanned aerial systems (UAS).

Hollerstraße 12,
61350 Bad Homburg,
Fax Number

Sky Power GmbH, manufacturer of two-stroke gas engines, develops and patents next-generation heavy-fuel (HF) engines for unmanned aerial systems (UAS). All HF-engines can run with JET A-I, JP-5, JP-8, mix ration 2% Aspen Oil 0.1% Diesel Valve Cleaner.

Sky Power engines are used in unmanned fixed wings, helicopters, VTOLs and hybrid unmanned aerial vehicles (UAV). HF-Wankel engines and the sub-systems, are also part of the product line.

Single and multiple cylinder engines for UAS

Sky Power offers one-cylinder and two-cylinder engines.

Sky Power has more than 35 years of experience in the design, manufacture and testing of two-stroke engines.
All Sky Power engines can be supplied with a carburettor and an electronic injection.
The company began researching and developing heavy-fuel engines in 2007.
Sky Power's complete propulsion units consist of unpack, install and take off.
The Wankel Rotary Engine is a hybrid cycle engine with a compact design.

All two-stroke engines measure 55cm and are delivered as a twin-spark (TS) version. The safety and reliability increase in both single-cylinder and multiple-cylinder engines when using the TS cylinder.

Both ignitions work independently and the engine runs at a quieter yet lower idle. When one ignition fails, the second ensures that the engine continues to run with slightly reduced rotational speed.

Rotary UAV engine for field operations

The Sky Power SP-180 SRE hybrid is a compact hybrid cycle engine, which is lightweight and offers a high power-to-weight ratio, enabling higher payloads during field operations. With the hybrid-boost power capabilities, an additional 15KW simplifies its lift-off or acceleration processes.

The engine can be powered using gas or HF, so the company also supplies a standard manifold or a high-pressure injection (HPI).

Customised military engines for high-powered applications

All standard engines by Sky Power can be tailored according to customer specifications based on the used aircraft type, the required performance parameters or the fuel types.

The company also introduces a novel UAS-engine construction kit in order to enable still more efficient and performance-optimized engines in future. Using this construction kit, propulsion units can be ideally tuned to the customer’s desired performance parameters and application area.

The engine kit consists of widely different components. At the centre is the basic engine, which can be equipped with both a carburettor and the new injection from Sky Power. Exhaust, silencer, and the new ECU and ignition is added to this as desired. The engine can furthermore be provided with an e-drive or generator, which uses a converter to generate electrical energy for batteries and super capacitors.

The engine can therefore be used as a pure power generator for electrical motors, but also as a combined system in which electrical and combustion energy can be used in combination. Pure usage from combustion energy is likewise possible.

The engine can therefore be used as a pure power generator for electrical motors, but also as a combined system in which electrical and combustion energy can be used in combination. Pure usage from combustion energy is likewise possible.

Long-term tests to verify vehicle durability

Sky Power offers a wide variety of long-term tests, from the 50-hour test for microlight aircraft to tests of up to 200 hours, which are adapted and performed individually according to client requests using sophisticated measuring instruments.

Muffler systems for engine development

Sky Power’s mufflers use a variant of turbine wheels that are installed permanently in a cylinder.

The individual fins mounted on the wheels are queued up in defined angles, where they are arranged in opposed directions depending on the angle. This arrangement smooths the exhaust gas’ sound wave.

Time-between-overhauling (TBO) for ultimate engine performance

TBOs depend on the used RPM-level, the flight environment, the constant maintenance and the engine type. Due to that, the TBO is depending on the customer and his mission.

Sky Power knows that customers achieved with the Sky Power engines TBOs more than 500 hours per engine.

About Sky Power GmbH

Sky Power GmbH is the leading manufacturer of 2-stroke combustion and Wankel engines for UAS (Unmanned Aerial Systems) and hybrid applications. In addition to its own development and manufacturing, Sky Power produces all engines in Germany.

Complete propulsion units, customer adaptations, new developments and the capacity extension of the combustion engines are another corporate objective.

Sky Power presents newly developed SP-110 FI TS

Sky Power GmbH introduced itself to the specialist public for the first time at this year's AUVSI Xponential in Denver. Since then a series of new engines have been developed for a wide variety of Unmanned Aerial System applications (UAS).

18 December 2018

Sky Power increases its cooperation with Mejzlik Propeller

ky Power GmbH has intensified its cooperation with Czech company Mejzlik Propeller following a growing number of enquiries concerning complete drive units for Unmanned Aerial Systems (UAS). The objective is the development of propellers coordinated individually to the engine and the customer application.

18 December 2018

3W-International’s Performance Partner Sky Power and A-techsyn Introduce First Sky-Power-Driven VTOL

A-techsyn - manufacturer of VTOLs, fixed-wing UAS's, target-acquisition drones, and communications and autopilot systems - will introduce the first VTOL equipped with one of 3W-International's performance partner Sky Power's engines at Xponential 2018 as part of the 3W-International exhibition stand. A SP-110 FI TS based on 3W-International's 110ccm model is involved here. The engine can be deployed both as vertical drive and for power generation.

30 April 2018

3W-International Remains Unaffected by 3W-Modellmotoren’s Filing for Bankruptcy

The executive management of 3W-Modellmotoren, which acted as production service provider for 3W-International, filed for bankruptcy during the past week. For this reason, Karsten Schudt, managing director of 3W-International, is making a statement that the leading engine supplier for UAS's is covered concerning this development.

23 April 2018

3W-International to Expand Sales in North America

To further expand its market presence in North America, 3W-International is expanding its own direct sales structure in this important target market. With Constantin Diehl, a representative has been acquired who will actively represent the German engine manufacturer in the US, Canada, and Mexico.

20 April 2018

Sky Power Introduces First Revised 3W-International Engine at Xponential 2018

3W-International's performance partner, Sky Power, will introduce the first advanced engine to the professional public at Xponential 2018 in Denver. It involves a 110ccm, 2-stroke power plant that has been provided with a new injection and ignition. The basic engine originates from the firm of 3W-International.

16 April 2018

Sky Power GmbH

Hollerstraße 12
61350 Bad Homburg

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