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UAV ENGINES

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Electonic fuel injection 

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Starter Generator Unite

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What We Offer

85 FS UAV

​ROTO 170 FS UAV

Custom UAV engine

ROTO 35 FS UAV

​ROTO 85 FS UAV

​ROTO 125 FS UAV

*Use buttons to select engine for configuration

  • Introducing a four-cylinder, four-stroke engine, air-cooled, is equipped with a controlled CDI unit with a preset advance curve for smooth operation. This engine stands out for its very smooth operation without vibrations. These low vibrations are achieved by the engine's design, where as an opposed boxer it has excellent characteristics in all projects where it is necessary to ensure smooth operation without vibrations. Its excellent fuel consumption is also achieved by the option to use Roto EFI equipment for reaching high altitudes or low fuel consumption. The Roto 170 FS UAV has a high lifespan, thanks to the materials used in pistons and cylinder liners.

    Introducing a twin-cylinder four-stroke engine, very powerful, air-cooled, controlled by a CDI unit with a preset advance curve for smooth operation, designed for use in UAV projects. It is highly sought after for UAV, V-TOL, and Heli projects, where this engine is most commonly used due to its favorable weight-to-power ratio, high performance, and very low fuel consumption. The Roto 125 FS UAV has a high lifespan, its long durability is continuously tested in many projects around the world. This engine is the most sought-after type in the UAV sector, notable for its high performance and low fuel consumption.

    Introducing a twin-cylinder four-stroke engine, air-cooled, controlled by a CDI unit with a preset advance curve for smooth operation, designed for use in UAV projects. It is highly sought after for UAV, V-TOL, and Heli projects, where this engine is most commonly used due to its low weight, high performance, and very low fuel consumption. The Roto 85 FS UAV has a long lifespan, tested by dozens of successful projects. This engine is the most sought-after type in the UAV sector.

    We specialize in the development and manufacturing of top-tier four-stroke engines, designed with long-term durability, efficient fuel consumption, and flexibility in use in mind. Our engines are the ideal choice for UAV projects that require reliability and efficiency in demanding conditions.
     

    We offer an extensive range of engines from 35cc to 170cc, covering a wide spectrum of applications, from lightweight UAVs to more demanding aircraft that require greater power. All our engines are equipped with a remote start option via a starter generator, which also provides electrical power for onboard needs, thus increasing the flexibility and autonomy of your projects.
     

    Explore with us the possibilities our engines can offer, and take your project to new heights with ROTOMOTOR. Our technical teams are ready to help you find the best solution for your needs.

    Introducing a single-cylinder four-stroke engine, air-cooled, controlled by a CDI unit with a preset advance curve for smooth operation, designed for use in UAV projects. It is most sought after for V-TOL projects, where this engine is commonly used due to its acceptable weight, good performance, and especially low fuel consumption.

  • 200 / 100 Hours

    34,3 ccm

    2,3 kW 

    360g/h

    Electronic 4-14V

    Air Cooled

    Petrol 95 oct. + 2% oil

    1200 - 6500 rpm

    1740g

    160g

    TBO

    Displacement

    Power

    Fuel consuption

    Ignition

    Cooling

    Lubrication

    Speed

    Engine weight

    Ignition weight

    200 / 100 Hours

    79,5ccm

    4,8 kW 

    900g/h

    Electronic 4-14V

    Air Cooled

    Petrol 95 oct. + 2% oil

    1200 - 6500 rpm

    3260g
    190g

    200 / 100 Hours

    125 ccm

    8,3 kW 

    1 143g/h

    Electronic 4-14V

    Air Cooled

    Petrol 95 oct. + 2% oil

    1200 - 6500 rpm

    3970g
    170g

    200 / 100 Hours

    162 ccm

    9,8 kW 

    1 553g/h

    Electronic 4-14V

    Air Cooled

    Petrol 95 oct. + 2% oil

    1200 - 6500 rpm

    5050g
    370g

  • FUEL SYSTEM

    Electronic Fuel Injection

    Carburetor

    ELECTRIC SYSTEM

    Start generator

    Generator

    1300W

    550W

    300W

    600W

    1300W

    Full

    Light

    Back manifold

    Front manifold

    Site manifold

Electric system

Start Generator

Under the brand "STG Roto," we offer start generators with outputs of 550W and 1300W. Designed for peak performance and efficiency, the STG Roto start generators work exclusively with the E-Control unit. This electronic system is tailored for managing motor-generators, enabling remote combustion engine startups, battery recharging, and hybrid operation, thereby enhancing the combustion engine's performance (Hybrid system).

The "STG Roto" generators convert mechanical energy into electrical energy through the principle of electromagnetic induction. Here, the rotating part (the rotor) creates a moving magnetic field, which induces an electric current in the coils of the stator (the stationary part of the generator).

How it works ? 

STG ROTO 550W

STG ROTO 1300W

Not recommended

260W

340W

440W

550W

550W

Not recommended

680W

870W

940W

1120W

1300W

< 2500 RPM

3500 RPM

4000 RPM

4500 RPM

5000 RPM

55000 RPM

From the graph, it's evident that both the STG ROTO 550W and the STG ROTO 1300W begin to operate at 2500 RPM, achieving their maximum output at 5500 RPM. This demonstrates their efficiency and robust power generation capability across a wide range of operational speeds, ensuring that UAV projects have the power they need, precisely when they need it.

Performance

Thanks to the E-Control unit, STG Roto generators have the capability of remote starting and managing the combustion engine. This allows users to activate the generator remotely. Additionally, the generators can recharge batteries, which is crucial for maintaining power in other UAV project controls, significantly extending their potential usage time.

Smart operations

Generator

Generators under the trademark "AL Roto" are available in the range from 300 to 1000W. These power generators have been developed with Roto regulators, capable of providing a stabilized voltage in the range of 3.3V to 60V. These generators do not feature the capability for remote starting of the internal combustion engine.
Their main advantage lies in their ability to deliver high power with stabilized voltage energy, ideal for direct power consumption onboard your project.

Fuel system

Electronic fuel injection

One of the significant benefits of electronic fuel injection (EFI) is its ability to achieve remarkably low fuel consumption. When installed on the Roto 125 FS engine, the EFI can realize fuel savings of up to 40% compared to traditional carbureted engines. While the initial costs for the EFI Roto system are higher than those of carburetor-based engines, we offer a basic injection package, with all additional components available for customization based on individual needs.
 

The production version is designed with the assumption that no extra devices such as lambda probes, temperature sensors, and the Control module are necessary for the EFI setup. By the time of mass production, the initial higher costs will be balanced out by the savings afforded by the lower-priced EFI Light and reduced fuel consumption.

Significant advantage is the system's capability to operate efficiently at altitudes above 5000 meters above sea level.

Carburetor

For all Roto engines, Walbro brand carburetors can be utilized. These carburetors are primarily used for missions at lower altitudes, typically up to 1000 meters above sea level (m.a.s.l.), where there is no need yet to compensate for the amount of oxygen. Carburetors also bring significant added value in terms of cost; they are often a much cheaper option than the Roto EFI system. Therefore, Roto always recommends considering the economics of the project.


The performance of engines is very similar, so it cannot be determined whether an engine with EFI or a carburetor will be more powerful or not. Another important parameter is the economy of flight; EFI always has better fuel consumption than a carburetor.

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