Heavy Fuel, Gasoline Engines & Wankel Rotary UAV Engines

Sky Power GmbH
Sky Power UAV Engines

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.

Gasoline and Heavy Fuel (HFE) UAV Engines

Our gasoline and Heavy Fuel engines for UAVs are available in one- or two-cylinder models and have been tested under the harshest of conditions to ensure the highest performance and reliability. We can also provide our patented engine mufflers to further reduce noise levels.

All engines with a capacity of 55 cc or higher can be delivered as a twin-spark version, with independently operating ignitions. This provides quieter running, increased safety and reliability and redundant operation. Fuel injection options are also available.

All gasoline engines can also be upgraded to Competition series, optimized for enhanced performance with modified transfer ports and individually adjusted compression for each cylinder. Competition series engines benefit from increased power and torque, as well as improved throttle response at lower RPM ranges, and are painted with two coats of highly temperature-resistant metallic orange 2K engine paint.

Learn more: Gasoline and Heavy Fuel (HFE) UAV Engines

Single-Cylinder Multi-Fuel UAV Engines

SP-28 Single-Cylinder Gas UAV Engine

SP-28 Single-Cylinder UAV engine

The SP-28 is the smallest single-cylinder engine our portfolio, weighing just 2.2lbs.

The engine is equipped with a carburettor and an improved cylinder design for higher thermal stability, and will soon be upgraded with our new updated SP-IGU ignition design.

SP-55 Single-Cylinder UAV engine

The SP-55 single-cylinder UAV engine can be equipped with either carburettor or fuel injection, as well as a twin-spark plug option. The compact design features a rear output shaft, allowing a generator to be mounted on the back of the engine. All engine variants are equipped with our HKZ215 ignition and ECU030 control unit.

Versions: SP-55 TS / SP-55 FI TS ROS / Heavy fuel and range extender for multicopter variants coming soon.

Compare our Single-Cylinder Multi-Fuel Engines:

SP-28 SP-55
Capacity 28 cc / 1.71 cu. in 55 cc / 3.35 cu. in.
Power 3.4 hp / 2.5 kW 4.18 hp / 3.1 kW
Speed Range 2500 – 10000 RPM 2000 – 10000 RPM
Weight 2.5 lbs (1.1 kg) incl. carburettor 4.55 lbs (2.06 kg)
Fuel Injection No Yes
Electronic Ignition No Yes
Twin Spark No Yes

View our entire range of UAV engines >

Two-Cylinder Multi-Fuel UAV Engines

SP-110 Two-Cylinder UAV engine

The SP-110 is the smallest two-cylinder engine in the Sky Power portfolio, with a weight of 6.39 lbs. The engine can be equipped with either carburettor or fuel injection, as well as a twin-spark plug option. A generator can be mounted on the rear output shaft, and fuel injection electronics can be installed in an optional external enclosure which is mounted on top of the cylinders.

Versions: SP-110 TS / SP-110 FI TS / Heavy fuel variant coming soon

SP-170 TS 2-cylinder drone engine

SP-170 Two-Cylinder UAV engine

The SP-170 is a 170cc two-cylinder engine that can be equipped with either carburettor or fuel injection, as well as a twin-spark plug option. A generator can be mounted on the rear output shaft, and fuel injection electronics can be installed in an optional external enclosure which is mounted on top of the cylinders.

Versions: SP-170 TS / SP-170 FI TS / Heavy fuel variant coming soon

SP-210-series Double Cylinder Gas-Engine

SP-210 Two-Cylinder UAV engine

The SP-210 is a 170cc two-cylinder engine with a power output of up to 13.41 hp/ 10 kW at 6000 RPM. It can be equipped with either carburettor or fuel injection, as well as a twin-spark plug option. A generator can be mounted on the rear output shaft, and fuel injection electronics can be installed in an optional external enclosure which is mounted on top of the cylinders.

Versions: SP-210 TS / SP-210 FI TS / Heavy fuel variant coming soon

SP-275 Two-Cylinder UAV engine

The SP-275 is our most powerful twin-cylinder UAS engine, providing up to 25.73 hp/18.92 kW of power. It can be equipped with either carburettor or fuel injection, as well as a twin-spark plug option.

The SP-275 TS CR variant has been specially designed for target drone applications, with a rear carburettor and a low-profile design optimized for high-speed training flights requiring minimal aerodynamic cross section.

Versions: SP-275 TS / SP-275 FI TS / SP-275 TS CR / Heavy fuel variant coming soon

All engine variants, except for the SP-275 TS CR, are equipped with our HKZ215 ignition and ECU030 control unit. Fuel injection electronics can be installed in an optional external enclosure which is mounted on top of the cylinders.

Compare our Two-Cylinder Multi-Fuel Engines:

SP-110 SP-170 SP-210 SP-275
Capacity 110 cc / 6.7 cu. in. 170 cc / 10.37 cu. in. 210 cc / 12.81 cu. in. 275 cc / 16.7 cu. in.
Power 7.48 hp / 5.5 kW @ 6000 RPM 12.82 hp / 9.4 kW 13.41 hp / 10.0 kW @ 6000 RPM 25.73 hp / 18.92 kW
Speed Range 2200 – 6500 RPM 1000 – 10000 RPM (depending on version) 2200 – 6500 RPM 2000 – 10000 RPM (depending on version)
Weight 6.39 lbs (2.9 kg) 9.57 lbs (4.34 kg) 12.74 lbs (5.78 kg) 16.01 lbs (7.26 kg)
Fuel Injection Yes Yes Yes Yes
Electronic Ignition Yes Yes Yes Yes
Twin Spark Yes Yes Yes Yes

View our entire range of UAV engines >

Wankel Rotary UAV Engine

SP-180 SRE hybrid Wankel UAV engine

SP-180 SRE Wankel rotary UAV engine

The SP-180 SRE is a Wankel rotary UAS engine featuring a compact hybrid electrical design and an outstanding power-to-weight ratio. An optional hybrid-boost mode provides up to 15 kW of additional power, enabling a higher payload capacity and improved take-off performance for fixed-wing and VTOL UAV platforms.

The SP-180 SRE can run on gasoline or heavy fuel. The housing is water-cooled and the rotor is oil-cooled, allowing the system to maintain highly reliable operation under even the most challenging of flight conditions. Fuel injection is offered as standard, with an additional high-pressure fuel injection (HPI) option available upon request.

Specifications

Capacity 180 cc
Power 20 kW / 27.5 hp @ 6000 rpm
28 kW / 38.5 hp @7500 rpm (high power version)
Torque 32 Nm @ 6000 rpm
36 Nm @ 7500 rpm
Weight 6.80 kg / 14.99 lbs
9.50 kg / 20.94 lbs with generator
Power-to-weight ratio 5.66 hp/kg / 2.57 hp/lbs

UAV Engine Construction Kit

We have developed a novel UAS-engine construction kit in order to enable 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.

UAV Engine Kit

UAV Engine Construction KitThe UAV engine construction kit consists of a number of different components. At the centre is the basic UAV engine, which can be equipped with both a carburetor and the new injection from Sky Power. An exhaust, silencer, and the new ECU and ignition can be added to this as required. In addition, the engine can be supplied 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 also possible.

More information: UAS Engine Construction Kit

UAV Engine Accessories

HKZ 215 UAV Ignition System

The HKZ215 is a high performance ignition system which achieves considerably higher ignition performance. Thereby the overall performance of the engine is increased and the exhaust emission values are improved.

The HKZ is installed in a light and robust, nickel-plated aluminium housing. All add-on components such as connection sockets, spark plug connectors are designed for demanding areas of application. The ignition system is shielded and only has low interference radiation.

HKZ 215 UAV Ignition System

More information: HKZ 215 UAV Ignition System

ECU030 UAV Fuel Injection System

The ECU030 is a fuel injection system for 2- and 4-stroke engines. The universally applicable electronic fuel injection system can be used not only for petrol blends but also for HF applications. An automatic controller adapts the fuel blend to the actual air pressure and the external temperature. Four ignition channels with two separate adjustable injection nozzles ignite the fuel blend. In the process, the pump pressure is electronically regulated. An automatic choke function is also built in. All engine data can be monitored by means of a PC. The user interface is so intuitive that all settings and the maintenance of the engine can be easily carried out.

ECU30 UAV Fuel Injection System

The ECU 030 consists essentially of the following functional modules:
1. Digital inputs
2. Analogue inputs
3. Switching outputs (low side) & Switching outputs (high side)

The CAN-BUS serves for communication. The following functions are controlled via the CAN-BUS:
1. Control functions such as control of the servo motors, fuel injection
2. Evaluation of the sensor signals (analogue, digital)
3. General diagnostic functions
4. Manual diagnostic functions
5. System updates

More Information: ECU030 Fuel Injection System

Services

Engine break-in tests

Sky Power handles break-in tests for your UAV engines. The engines are broken in on the in-house engine test stands, according to your specifications. So you obtain a “ready-to-fly” engine that can be used immediately in your UAS, saving preparation time and allowing you to begin your deployment immediately. You can generate instant sales with an engine broken in by Sky Power, especially in industrial and commercial applications.

Customer and endurance test (engine tests)

Sky Power conducts engine tests according to your specifications; individual usage parameters can be simulated in the process and each engine test is documented. Our precise instruments allow us to accurately measure fuel consumption, engine parameters, and exhaust-gas temperatures. The engine tests can also include endurance tests, during which your engines are subjected to between 50 and 200 hours of uninterrupted loading on the in-house engine test stands. Climate tests are also possible. After each test, the engines are disassembled and examined, and full test results are made available to the client.

We can conduct the following tests :

  • General performance measurement of combustion engines
  • Thrust and power measurement
  • Exhaust analysis
  • Engine indexing
  • Endurance testing
  • Blower-, water-, and oil-pump analysis
  • Cylinder-head measurement
  • Load-change calculation
  • EMC measurements
  • Climate and temperature tests.

Overhaul and maintenance

The time between overhauling (TBO) of Sky Power engines can vary depending upon operating environment and maintenance intensity. After achieving maximum TBO, Sky Power can then overhaul the engine. The engine has to be sent to Germany for this.

For each engine, the operating manual describes in detail the individual maintenance steps and their intervals, which can be completed by the operator. We can provide a spare-parts packet for each engine, to allow to you conduct simple maintenance tasks yourself at any time.

Larger maintenance tasks can be completed by Sky Power at our facility in Germany. Please contact our Service Department.

Repair

Generally, only Sky Power’s Service Team can repair an engine following a crash. Please contact us to determine whether a repair is even possible, before you send in the engine. Detailed engine tests are  carried out as part of the repair work, in order to document the engine’s operational readiness.

Customer-specific service on request

We’ll be happy to develop an individual service concept for you, based on your needs. Please contact our Service Department.

Send an Enquiry

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