China Drone Engine Manufacturers Suppliers Factory - Customized Drone Engine

Limbach DL550E 50HP UAV Piston Engine

The Limbach DL550E (L550E) is a four‑cylinder horizontally‑opposed air‑cooled two‑stroke piston engine. Adopting solid‑state magneto ignition and mixture lubrication design, it supports both pusher‑type and tractor‑type installation. It delivers stable 37 kW (50 HP) power output, features excellent power‑to‑weight ratio, low‑vibration performance and high reliability, widely adopted for large‑scale fixed‑wing UAV, VTOL platforms and unmanned helicopters.

Four‑cylinder horizontally‑opposed layout, low vibration for long‑duration UAV missions

Air‑cooled two‑stroke design, simple structure, high power‑to‑weight ratio

Solid‑state magneto ignition, stable ignition performance under harsh flight conditions

Mixture lubrication, compatible with gasoline / 100LL aviation fuel

Support pusher‑mount & tractor‑mount installation

Mature field‑proven platform, widely deployed for industrial UAV projects worldwide

Application Scenarios

Suitable for UAV take‑off weight 200‑450 kg fixed‑wing / VTOL drone; 100‑160 kg unmanned helicopter.

Long‑endurance fixed‑wing UAV

Heavy‑lift VTOL industrial drone

Unmanned helicopter platform

Surveillance & mapping UAV

Patrol & monitoring airborne systems

Why Choose Limbach DL550E Piston Engine

✅ Low‑vibration horizontally‑opposed four‑cylinder structure

Horizontal opposed layout greatly reduces vibration compared with twin‑cylinder engines. Protects airborne payloads such as cameras, LiDAR and surveillance pods during long‑time flight.

✅ Mature aviation‑grade original design

Originally designed for manned light aircraft, adapted for UAV usage. Thousands of units have been operated globally, stable performance in high‑altitude, high‑temperature and desert environments.

✅ Flexible installation compatibility

Supports tractor pull‑type and pusher push‑type mounting, convenient for fixed‑wing, VTOL and helicopter airframe integration.

✅ Easy maintenance & global spare‑parts availability

Air‑cooled two‑stroke structure, no complex water‑cooling pipeline. Simple daily overhaul, spare parts can be sourced worldwide.

✅ Dual‑fuel compatibility

Works with common 95# unleaded gasoline as well as 100LL aviation gasoline, reducing field fuel supply pressure for remote‑area missions.

Installation & Operation Notes

Key reminders for airframe integrators & UAV developers

01/

Lubrication requirement

Must use fully‑synthetic 2‑stroke aviation oil, fuel‑oil mixing ratio 50:1(1:50). Do not use ordinary two‑stroke oil for motorcycles.

02/

Cooling requirement

It is air‑cooled engine. Your airframe must design reasonable air‑inlet & air‑outlet duct to guarantee cooling airflow. Overheating will cause engine failure.

03/

Carburetor adjustment

Two diaphragm carburetors, no choke structure. Need professional calibration according to altitude and working environment.

04/

Mounting requirement

Need vibration‑damping mounting pads. Strictly follow official installation torque requirements for crankcase and cylinder bolts.

05/

Ignition check

Dual‑cylinder simultaneous ignition with 180° phase difference. Check ignition timing before first test run.

06/

Break‑in period

New engine requires strict running‑in procedure, cannot run full power continuously in initial hours.

Core Features of Micro Turbojet Engine

High‑thrust fuel‑powered propulsion, delivering stable thrust output under ISA standard atmospheric conditions, suitable for high‑speed unmanned aerial vehicles, target drones and experimental aircraft.
Compact cylindrical metal structure with high power‑to‑weight ratio, offering strong thrust while keeping overall weight controlled.
Supports wide operating altitude, maximum flight altitude up to 12000 m, adapts to high‑altitude flight missions.
Excellent overload resistance, withstands 6 g maneuvering overload and 25 g impact overload, reliable for intense flight conditions.
Mature thermal design, stable exhaust temperature performance, equipped with complete wiring harness for convenient installation and signal connection.
Clear maintenance cycle: 25‑hour scheduled maintenance period to guarantee long‑term operational safety.
Low specific fuel consumption, reasonable fuel consumption at maximum speed, balances power output and fuel economy.

Products Description

Industrial‑grade micro turbojet engine, delivers high thrust for high‑speed target drones, jet UAVs and hybrid VTOL platforms, supports bench R&D tests and real‑flight validation.

Power Source for High‑Speed Target Drones： Serve as core power unit for high‑speed target drones and threat‑simulating vehicles, for anti‑drone & air‑defense system detection, tracking, interception tests and military drills.

Jet‑Powered UAV & Loitering Munition Propulsion： Equip fixed‑wing jet UAVs for long‑duration high‑speed cruise; act as propulsion for loitering platforms to achieve high‑velocity, long‑range flight.

R&D Test Platform for Research Institutes & Universities： Ground bench test and flight validation for turbojet research, fluid dynamics, flight‑control algorithms, thermal management and fuel‑control systems.

Aviation Power Teaching & Training： Used in vocational schools and training institutions for aviation‑power hands‑on training: turbojet disassembly‑assembly, ignition debugging and fuel‑system practical teaching, serve as demonstration teaching aids.

Ground Jet Blast Simulation Test： Ground high‑temperature high‑speed jet flow simulation, evaluate material heat‑resistance, protective coating performance and component anti‑erosion capability.

Jet‑Assisted VTOL Hybrid UAV： Combine with multirotor units for hybrid VTOL: multirotor for vertical take‑off & landing, turbojet delivering high‑speed forward thrust for long‑range cruise.

Large‑Scale Jet RC Aircraft： Provide high thrust for large jet RC model aircraft to support high‑speed model flight.

Special Industrial Validation Carrier： Test airborne sensors, data links and autopilot performance under high‑speed and high‑temperature jet‑engine operating conditions.

Power for Aerial Decoy Vehicles： Power source for airborne decoy platforms, simulate infrared signature and velocity features of real jet aircraft for countermeasure jamming drills.

FAQ

Q: What fuel is suitable for these micro turbojet engines?

A: Recommended fuel is Jet A‑1 / kerosene. Please use qualified filtered aviation‑grade fuel. Impure fuel will cause component wear and void warranty. Diesel or gasoline is not allowed.

Q: What is the maintenance cycle of the turbojet engine?

A: The scheduled maintenance period is 25 operating hours. After reaching the cycle, inspection, cleaning and wearing‑part replacement are required to guarantee long‑term safe operation.

Q: What is the maximum starting altitude and maximum flight altitude?

A: TJ40‑TJ100 series max starting altitude: 4000 m, max flight altitude: 12000 m. TJ125‑TJ160 series max starting altitude:4500 m, max flight altitude:12000 m. Thrust will decrease as altitude rises under ISA conditions.

Q: What drone platforms fit for Limbach DL550E engine?

A: It is designed for 200‑450kg take‑off weight fixed‑wing / VTOL UAV and 100‑160 kg unmanned helicopter platforms.

Q: What fuel can DL550E use?

A: Unleaded 95‑grade gasoline or standard 100LL aviation gasoline, mixed with two‑stroke synthetic oil at 50:1 ratio.

Q: Is starter and generator included in standard unit?

A: Starter and generator are optional accessories, not included in standard configuration.

Xpert Intelligent Equipment Co., Ltd. is one of the most experienced drone engine manufacturers and suppliers in China, also supports customized service. Please feel free to wholesale bulk discount drone engine in stock here from our factory. Quality products and reasonable price are available.