A33N UAV Engine System

As of July 1, 2022 Power4flight will no longer be selling complete engine solutions. This product will now be available directly from our partners at Cobra Aero.
Please contact Cobra Aero for a product quote or more information.

The A33N UAV Engine System is Cobra Aero’s initial entrant in the A33 family of engines. The A33N engine is an all-new purpose designed UAS engine.

The Engine Package Includes:

Power4Flight IntelliJect ECU
Currawong self priming fuel pump and fuel pressure accumulator
All required EFI sensors and wire harnessing CHT, MAT, MAP, and fuel pressure
CDI module
Full induction and exhaust system
Electric power generator with start capability
Cooling duct with active control
Focal isolation mount

Engine with Integrated Generator

The A33N engine is a purpose designed UAS engine. It features a 3D-printed cylinder and exhaust and a high quality machined crankcase with integrated generator system. The 3D printed cylinder head minimizes engine-to-engine variability. This simplifies fleet management, allowing a ‘tighter’ fleet ECU calibration for improved performance and fuel economy.

Maxon Generator

The A33N engine is equipped with a 3-phase Maxon brushless motor used as a generator. The generator is driven by a toothed belt from the engine output shaft and produces 250 watts (500 watts intermittent) of electrical power. The generator includes sensors which allow it to be used to start the engine from a 24V supply (Power conditioning and starting electronics are a separate package).

Exhaust System

The exhaust system on the A33N reduces the acoustic signature of the engine as compared to conventional side-mount exhaust; and is designed to fit within an engine cowling to reduce airframe drag.

Key Features

Specifications

Documentation

CAD Files

High power to weight
Low acoustic signature
Custom focal isolation mount for reduced airframe and payload vibration
3D-printed aluminum head and cylinder improves engine repeatability
Hardware, electronics, and software all designed specifically for UAS applications
Machined crankcase with integrated belt driven starter/generator
Passed FAR33 150-hour endurance test

Engine Type:	Air-cooled 2-stroke single
Displacement:	33 cc (2.0 ci)
Weight:	2.25 kg (5 lbs) (Includes core engine, exhaust, ECU, fuel pump, injector, ignition, generator, harnesses)
Fuel Delivery:	Fuel injection at 3 bar (gasoline 50:1 premix)
Power Output:	2.0 kW (2.7 HP) at 8200 RPM
Fuel Consumption:	500 g/kW-hr (0.82 lbs/HP-hr) at cruise
Generator output:	250W (500W intermittent duty cycle)