The Telefly TF-TJ400 is a high-speed, small-size turbojet engine developed by the Chinese company Telefly for radio-controlled aircraft, scale models, experimental airplanes, and light unmanned aerial vehicles. This engine combines compact dimensions, reliability, and power, making it an attractive choice for engineering projects, education, and recreational aviation.
Key Technical Specifications
| Parameter | Value |
| Model | Telefly TF-TJ400 |
| Engine type | Turbojet, air-cooled |
| Maximum thrust | ~40 kgf (≈400 N) |
| Diameter | ~147 mm |
| Length | ~410 mm |
| Net weight | ~3.7 kg |
| Maximum rotational speed | up to ~98,000 rpm |
| Idle speed | ~25,000 rpm |
| Exhaust gas temperature | ~800 °C |
| Fuel consumption (full throttle) | ~1100 g/min |
| Fuel type | Kerosene / diesel (with additives) |
| Ignition | Electric |
| Maintenance interval | ≈25 hours |
Technical Features
Compact design.
The TF-TJ400 engine is designed to achieve an optimal thrust-to-weight ratio. With a weight of only about 3.7 kg, it produces approximately 40 kgf of thrust, making it ideal for small aircraft models, UAVs, or experimental platforms.
The turbojet unit can reach rotational speeds of up to ~98,000 rpm, providing a high airflow rate and stable thrust even at full throttle.
The model uses kerosene or diesel fuel with lubricating oil additives (recommended ratio: 5% kerosene and 3% diesel for lubrication), which makes operation relatively economical and accessible.
The electric start system allows the engine to be started at the push of a button, without complex manual preparation or additional mechanical starting devices.
Regular maintenance intervals are recommended approximately every 25 operating hours, which is typical for small turbojet engines of this class.
Applications of the TF-TJ400
Although the Telefly TF-TJ400 is often positioned as an engine for RC jet aircraft models, its capabilities also make it suitable for:
- technical training for students in aviation-related fields;
- research projects in small-scale jet propulsion systems;
- development of lightweight robotic platforms with jet propulsion;
- hobbyist projects and DIY engineering.
Interesting Technical Details
High-temperature materials.
Telefly engines use alloys capable of withstanding exhaust gas temperatures of around ~800 °C, which increases service life and operational stability even under intensive loads.
Air-based cooling system.
The cooling system relies on airflow, minimizing weight and design complexity compared to liquid cooling systems.
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