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.

Heavy Fuel Engines (HFE) for UAVs

Two-Stroke Multi-Fuel Engines for Fixed Wing and VTOL Drones

Our Heavy Fuel engines 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.

Engines with a cylinder capacity of 20.68 cubic inches and higher are fitted with manually operated compression release valves as standard, with automatically operated valves available upon request. Engines with a cylinder capacity of 3.30 cubic inches are fitted with automatically operated valves as standard, reducing the load on the crankshaft if an external electrical starter is used, and allowing the engine to be stopped and restarted while the UAV is in the air.

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.

Find out more: Heavy Fuel UAV Engines (HFE)

SP-210 HF FI TS 2-Cylinder Heavy Fuel Engine

The SP-210 FI TS is a 2-cylinder heavy fuel-engine and available with carburetor or fuel injection (FI). The engine is also available as gas version. Additional adaptions upon customer requests and specifications are possible. Power: 14.75 HP / 11.0 KW, Weight: 7.4 kg incl. ignition.

*Engine data might change due to the engine test procedure and the engine configuration.

SP-210 HF FI TS heavy fuel UAV engine

Specifications

Type 2-cylinder Heavy Fuel Engine
Capacity 210.0 ccm/12.81 cu in
Power 14.75 HP/11.0 KW
Bore diameter 2.16 inch (55 mm)
Stroke 1.77 inch (45 mm)
Speed Range 1000–7500 RPM
Weight 16.31 lbs (7.4 kg), incl. ignition
Crankshaft 4 ball bearing
Oil/Gasoline ratio 1:50 / 2 % mix
Operating Voltage 12 V DC
Torque 17.9 Nm/4900 RPM
Tested Heavy Fuel JET A-I, JP-5, JP-8
Mix ration: 2 % Aspen Oil
0,1 % Diesel Valve Cleaner

More Information: SP-210 HF TS

Gas Engines for UAVs

Two-Stroke Gasoline Engines for Fixed Wing and VTOL Drones

Our gasoline engines are also available in one- or two-cylinder models. All engines can be fitted with a carburetor, or with an electronic fuel injection system that increases power, reduces fuel consumption and allows better control and regulation of the engine. As with our heavy fuel engines, all gasoline engines with a capacity of 55 cc or higher can be delivered as a twin-spark version, with independently operating ignitions.

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.

Find out more: Gas Engines for UAVs

SP-55 TS 1-Cylinder UAV Gas Engine

The SP-55 TS is a 1-cylinder gas-engine and available with carburetor or fuel injection (FI). The engine is also available with a rear output shaft and also as heavy fuel version (HF). Additional adaptions upon customer requests and specifications are possible. Power: 4.18 HP / 3.1 KW, Weight: 1.8 kg incl. ignition.

*Engine data might change due to the engine test procedure and the engine configuration.

SP-55 TS 1-cylinder gas UAV engine

Specifications

Type 1-Cylinder Gas-Engine
Capacity 55 ccm / 3.35 cu in
Power 4.18 HP / 3.1 KW
Bore diameter 1.77 inch (45.00 mm)
Stroke 1.38 inch (35.00 mm)
Speed Range 1300 – 8500 RPM
Weight 3.94 lbs (1.8 kg) incl. ignition
Crankshaft 3 ball bearing
Oil/Gasoline ratio 1:50 / 2 % mix
Operating Voltage 12 V DC
Torque 6.57 Nm / 6950 RPM

More Information: SP-55 TS

SP-110 FI TS 2-Cylinder UAV Gas Engine

The SP-110 FI TS is a 2-cylinder gas-engine and available with carburetor or fuel injection (FI). The engine is also available as heavy fuel version (HF). Additional adaptions upon customer requests and specifications are possible. Power: 6.91 HP / 5.15 KW, Weight: 4.7 kg incl. ignition.

*Engine data might change due to the engine test procedure and the engine configuration.

SP-110 FI TS 2-cylinder gas UAV engine

Specifications

Type 2-Cylinder Gas-Engine
Capacity 110 ccm / 6.7 cu in
Power 6.91 HP / 5.15 KW
Bore diameter 1.77 inch (45.00 mm)
Stroke 1.37 inch (35.00 mm)
Speed Range 2000 – 5800 RPM
Weight 10.36 lbs (4.7 kg) incl. generator & ignition
Crankshaft 3 ball bearing
Oil/Gasoline ratio 1:50 / 2 % mix
Operating Voltage 12 V DC

More Information: SP-110 FI TS

Wankel Rotary UAV Engine

SP-480 Hybrid Twin Rotary UAV Engine

The Rotary UAS Engine SP-480 is a hybrid cycle engine with a compact design. The 4-stroke rotary engine is very light and offers an outstanding power-to-weight ratio. Therefore the engine allows a higher payload in field operations. With the hybrid-boost power, additional 15KW depend on store capacity. This additional power volume is simplifying lift off or acceleration. The SP-480 can run with gas or Heavy Fuel (HF). Thus, Sky Power offers a standard manifold or a high pressure injection (HPI).

The cooling of the engine is guaranteed by water cooling of the housing and oil cooling of the rotor (active cooling).

SP-480 SRE hybrid twin rotary UAV engine

Find out more: Wankel Rotary UAV Engine

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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