Currawong Engineering

Electronic Speed Controllers (ESC) and Single Cylinder EFI Engines for Drones

Currawong Engineering
Electronic Speed Controllers (ESC) and Single Cylinder EFI Engines for Drones
54 Patriarch Drive, Huntingfield, Tasmania 7055 Australia Regional offices
+61 3 6229 1973

Currawong Engineering is a specialist designer and manufacturer of high-quality power electronics and propulsion systems for UAVs (unmanned aerial vehicles) and drones.

Our advanced turnkey engines for UAVs, electronic fuel injection (EFI) technologies and drone electronic speed controllers (ESCs) have been utilized by a number of high-profile aerospace customers, including Insitu Pacific, Raytheon and Threod Systems.

UAV engines

All of our products are expertly and individually tested, and we maintain a thorough quality system that has been successfully audited by Tier 1 military customers.

Brushless Motor ESC for Drones & UAV

Electronic speed controllers for drone motor control

drone speed controllerOur aerospace-grade Velocity electronic speed controllers are designed to provide high-power, high-reliability control of 3-phase brushless DC drone motors. Featuring a peak output power of greater than 20kW, Velocity drone speed controllers are ideal for extreme heavy-lift platforms.

With native support for Piccolo and Ardupilot, Velocity ESCs can be easily integrated into a variety of drone designs. A wide range of parameters can be configured and graphed in real time via our power CEquip PC software, and firmware can be updated over CAN without the need to remove the ESC from the aircraft.

High-reliability drone ESC design

Thanks to optimized power electronics design and extremely low impedance MOSFET circuitry, the Velocity ESC runs cooler even when operating at maximum load.

Excellent thermal management means that most UAV applications will not require active cooling beyond natural convection of air over the ESC.

brushless motor escLow Impedance MOSFETs

The Velocity ESC has also been designed for superior performance even in high-temperature and high-vibration environments. With a lightweight anodized enclosure machined from aerospace aluminium, and high-quality conformal coating, the rugged brushless motor ESC units are engineered for longevity.

electronic speed controller for brushless motorRobust Mechanical Design

esc for brushless motorCeramic Capacitors

quadcopter esc motor controllerHeavy Copper PCB

Superior performance for optimal drone motor control

The Velocity ESC features an advanced sensorless starting algorithm, providing the high-reliability motor starting that is critical for VTOL transition. The system runs multiple commutation algorithms in parallel to ensure highly repeatable starting even for high-inertia systems.

Drone esc

The Velocity ESC provides superior RPM performance at both high and low motor speeds, with an integrated closed-loop RPM controller that can compensate for variations such as wind loading.

State-of-the-art drone ESC safety features

The Velocity ESC incorporates a powerful 32-bit microcontroller running an advanced RTOS (real-time operating system) that allows high-level telemetry and safety functions to run asynchronously with motor control. Safety features do not stop the operation of the motor, allowing it to operate even in a protection state.

drone motor control

The isolated CAN interface provides real-time reporting of ESC and motor telemetry data, such as RPM, current, voltage and temperature. All data can be recorded via on-board data logging in addition to being recorded in the autopilot.

Currawong can adapt Velocity ESCs to meet your unique requirements, as well as create custom cabling and harnessing solutions.


drone speed controllerVelocity HT drone motor controlVelocity HC Drone escVelocity HS Velocity XS Drone escVelocity XS
Dimensions (LxWxH) 110 x 60 x 29 mm
(4.33 x 2.36 x 1.14 in)
110 x 60 x 32 mm
(4.33 x 2.36 x 1.26 in)
110 x 60 x 21 mm
(4.33 x 2.36 x 0.83 in)
80 x 45 x 13.5 mm
(3.15 x 1.77 x 0.53 in)
Weight 300g (10.58 oz) 350g (12.35 oz) 250g (8.82 oz) 75g (2.65 oz)
Voltage 75V/18S 60V/14S 60V/14S 60V/14S
Current (Sustained/peak) 150A/300A 250A/500A 150A/300A 75A/150A
Power 10 kW 15 kW 7.5 kW 4.5 kW
Max e-RPM 250,000 electrical RPM 250,000 electrical RPM 250,000 electrical RPM 250,000 electrical RPM
Drive Frequency 5 – 75 kHz 5 – 75 kHz 5 – 75 kHz 8 – 48kHZ

More information: ESC for Brushless Motors >>

Single-Cylinder Engines for Drones

Our small 2-stroke engines for UAV can be supplied as a turnkey engine system complete with generator, power supply (with remote starter feature), isolation mount, low-noise exhaust and standard harnesses.

Corvid-29 EFI Engine

Small single-cylinder engine with EFI

Single cylinder engineThe Corvid-29 is a small 2-stroke engine that provides a complete high power density solution for small UAV propulsion. Based around a 3W-28 engine, it is equipped with a custom-designed crankcase, throttle body and low-noise exhaust.

The high-reliability 29cc engine features our proprietary EFI system and maintains optimum engine operating parameters in all phases of flight, avoiding the common flaws of carbureted engines such as icing, top-of-climb engine stalls and incorrect fuel-air ratios.

The Corvid-29 engine has undergone thorough reliability testing based on US Federal Aviation Regulations Part 33 (FAR 33), including two 150-hour cycle based endurance tests without the need for a major overhaul.



Weight: 3.17kg (6.98lb)
Displacement: 29cc
Fuel Type: PULP / 100LL / MOGAS
Fuel Consumption: 500g/kW-hr (0.82 lb/HP-hr) at cruise
Power: 1.8kW / 2.4HP at 9000 RPM
Generator: 250W / 500W intermittent duty cycle
TBO: 350 hrs
Recommended MTOW: 25 kg

Corvid-50 EFI Engine

High-power small 2-stroke engine with EFI

EFI engineThe Corvid-50 is a high-power single-cylinder engine designed for UAVs with a maximum takeoff weight of 25 to 40 kg. Based on the Desert Aircraft DA-50 engine, it features a custom crankcase, crankshaft, throttle body, starter generator, inlet manifold and integrated isolation mount.

The high-reliability engine features our proprietary robust EFI system and maintains optimum engine operating parameters in all phases of flight.

The Corvid-50 has passed a preliminary assessment against the endurance test specified in the US Federal Aviation Regulations Part 33 (FAR33).

small 2 stroke engine


Weight: 3.89kg (8.57lb)
Displacement: 50cc
Fuel Type: PULP / 100LL / MOGAS
Fuel Consumption: 500g/kW-hr (0.82 lb/HP-hr) at cruise
Power: 2.8kW / 3.8HP at 7000 RPM
Generator: 250W / 500W intermittent duty cycle
TBO: 350 hrs
Recommended MTOW: 40 kg

Hybrid Heavy Fuel Engine for Drones

Cortex HF50 Hybrid Engine

Two-stroke hybrid heavy fuel engine for UAVs

Hybrid Heavy Fuel Engine for DronesThe Cortex HF50 Series Hybrid is a two-stroke hybrid heavy fuel engine for UAVs, and is a highly suitable replacement for batteries, gasoline engines, and other propulsion systems in drone platforms with electrically-driven motors.

Based on the proven Corvid-50 design, the HF50 allows power to flow bidirectionally between the electrical system and the engine, enabling it to charge batteries during flight and power onboard electrical systems as well as the drone propellers. This arrangement allows UAVs to carry lower weight batteries and improve their flight endurance and operational range.

The HF50 also allows power to be directed from the battery to the engine for self-starting, power boost during flight, and in-air engine restart.


Weight: 4.7kg (10.36lb)
Displacement: 50cc
Fuel Type: UMAN-VP4F Heavy Fuel
Fuel Consumption: 600 g/kW-hr (electrical) at 5000 RPM & 50% throttle
Power: 2.4kW (electrical) at 7500RPM
Generator: 130 kV
TBO: 300+ hrs
Recommended MTOW: 40 kg

More information: Cortex HF50 Hybrid Engine >>

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Regional Offices & Locations
Currawong Engineering Australia 54 Patriarch Drive, Huntingfield, Tasmania 7055 +61 3 6229 1973 Contact Website