Home > UAV Engines > Corvid-29
Power, capability and confidence
The Corvid-29 engine is the debut offering in the Currawong family of EFI powertrain solutions. This engine has a high power-to-weight ratio, comes with Currawong’s EFI system and can easily be integrated into any airframe.
EFI engine with integrated generator and power supply
The Corvid-29 is a 29cc single cylinder engine having a high power density and minimal maintenance requirements. The engine has excellent reliability and the EFI system maintains optimum engine operating parameters in all regimes of flight. This avoids common flaws of carbureted engines such as icing, top-of-climb engine stalls and incorrect fuel-air ratios. The engine has passed two 150 hour endurance tests (based on the US Federal Aviation Regulation Part 33) without the need for a major overhaul.

One of the major advantages with a Currawong engine is that it can be supplied as a turnkey system including a generator, power supply (with remote starter feature), isolation mount, low noise exhaust and standard harnesses.

The Corvid-29 engine is recommended for aircraft with a maximum takeoff weight of 25 kg.

UAV engine
The Corvid-29 engine system includes:

  • Base 3W-28 engine with modified crankcase
  • Custom induction system with manifold and throttle body
  • Miniature engine control unit (ECU)
  • Self priming fuel pump
  • Super atomising fuel injector and CDI ignition
  • Manifold and cylinder head temperature sensors
  • Generator
  • Low noise exhaust (optional)
  • Engine isolation mount
  • Power supply with starter (optional)
  • Operation and service manual and ICD manual
Engine technology
The Corvid-29 engine is an advanced version of the 3W-28, with one principal improvement being the use of a fully machined crankcase manufactured by Currawong that overcomes porosity issues, provides a more precise path for internal fuel/air circulation and incorporates an integrated generator.

Over 700 Currawong’s EFI systems have been used on Honeywell’s T-Hawk micro air vehicle. The system has also been integrated onto a range of other engines. The EFI system consists of:

  • Compact ECU with mature and reliable control algorithms. It includes barometric pressure sensing, a complete throttle position and pump control solution as well as UAV-specific telemetry available on both serial and CAN interfaces
  • High accuracy positive displacement fuel pump with outstanding self priming capability and ability to maintain pressure, even in the event of aeration of the fuel
  • A robust fuel injector that uses an automotive injector body with proprietary interior modifications that provide very fine atomisation


The Corvid-29 is known as the B29i engine in the US and Canada

Engine type:Air-cooled 2-stroke single engine (3W-28)
Displacement:29 cc
Weight:2.4 kg (5.3 lb) (engine, generator, low noise exhaust excluding power supply)
Fuel delivery:up to 48g/min at 3 bar
Power output:1.8 kW (2.4 HP) at 9,000 RPM
Fuel consumption:500 g/kW-hr (0.82 lb/HP-hr) at cruise
Generator output:250W (500W intermittent duty cycle)

Contact Us


Lower Level, 54 Patriarch Drive, Huntingfield TAS 7055 Australia

 +61 3 6229 1973

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For US and Canadian customers, contact our distributor, Power4Flight


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