Moteur UC105i

UNICORN UC105i EFI Aircraft Engine —
Modern Fuel Injection for Ultralight and Experimental Aircraft

Introducing the UC105i: EFI Precision with Drop-In Simplicity

The UC105i is a 105 HP electronic fuel injection (EFI) engine designed as a direct replacement for the Rotax 912 ULS. It preserves full mechanical compatibility — same mounts, orientation, and interface — while introducing digital control over combustion and fuel delivery.

Designed for ultralight and experimental airframes, UC105i delivers precise throttle response, high-altitude performance, and ethanol fuel capability — all in a package with dry weight 1 kg lighter than Rotax 912 ULS.

French DSAC-registered for ultralight (ULM) aircraft.

Performance: EFI Efficiency vs Carbureted Systems

The UC105i delivers 105 HP maximum and 98 HP continuous power, with electronic fuel injection continuously adjusting mixture and ignition based on real-time altitude, temperature, and throttle inputs. This enables stable performance up to 18,000 ft, with no pilot-managed leaning.

Fuel consumption at 75% cruise:

• UC105i (EFI): 13.5 L/h
• Rotax 912 ULS (carbureted): 16.8 L/h
  → Up to 20% fuel savings

EFI ensures reliable starts in cold or hot weather, without choke or priming. Compared to legacy mechanical systems, the UC105i delivers consistent combustion and throttle response — reducing fuel burn, emissions, and cockpit workload.

When used with E85 aircraft fuel, the UC105i qualifies as an eco-friendly aircraft engine, offering up to 78% CO₂ reduction and eliminating lead emissions.

Operational Safety and Redundant EFI

The UC105i uses a single-ECU system with built-in fallback logic and redundant sensors and injectors. Critical engine functions are duplicated to ensure safe operation in case of a component fault — without requiring pilot input.

Key system elements:

If a sensor or pump fails, the ECU automatically switches to backup maps and hardware. A dedicated EFIS display provides diagnostics and live alerts.

Fuel Compatibility and Flex Operation

The UC105i supports FlexFuel operation with automatic fuel blend recognition — no switches, no manual programming.

Supported fuels:

E85 is widely available in France at ~€0.80/l. The system automatically adjusts injection and ignition timing, making the UC105i both cost-efficient and emissions-conscious — with up to 78% less CO2 and  90% fewer fine particles compared to leaded fuel.

What’s Included in the EFI Retrofit Kit

Delivered as a complete EFI retrofit kit, the UC105i installs directly in place of the Rotax 912 ULS. No structural changes or custom mounts are required.

Included components:

This EFI kit replaces the 912 ULS while maintaining compatibility with existing exhaust systems, airframes, and cowlings.

Installation and Integration

The UC105i is designed for quick retrofit into any airframe using the Rotax 912 ULS. No frame drilling, cowling redesign, or reconfiguration is needed.

Maintenance and Support

With no carburetors and fewer mechanical adjustments, the UC105i reduces operating time and cost. The engine’s digital core enables smarter, preventive maintenance. EFI diagnostics help predict issues before they become failures.

If a component fails, the system maintains engine function using safe fallback profiles. Notifications are shown via EFIS, and no immediate action is required from the pilot.

Aircraft Compatibility

UC105i is compatible with aircraft originally configured for the Rotax 912 ULS. Successfully installed on:

Ready to Switch from Carburetors to Digital EFI?

Let’s configure your UC105i setup.

Frequently Asked Questions (FAQ)

Q1: Is the UC105i compatible with my ultralight aircraft?
Yes — it’s a direct-fit Rotax 912 replacement, using the same mount points, exhausts, and accessories. Made to feet 95% of aircrafts on the market.

Q2: What fuel types can I use with this EFI system?
SP95, SP98, SP95-E10, UL91, 100LL Avgas, and E85 aircraft fuel. The ECU detects and adapts to each type automatically.

Q3: Do I need to reconfigure anything for E85?
No. The E85 compatible EFI system handles ethanol blends natively. No user action or hardware change is needed.

Q4: What happens if a sensor fails mid-flight?
The engine has redundant inputs and failsafe logic. If a critical sensor fails, it automatically switches to fallback maps and continues operation. Alerts are shown on the EFIS.

Q5: How much weight does the UC105i save compared to 912iS?
The UC105i is 10.5 kg lighter than the 912iS and 1 kg lighter than the 912 ULS — despite its full EFI and dual-pump setup.

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