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
Full Specification Table
| Parameter | Specification |
|---|---|
| Rated Power | 37 kW (50 HP) @7500 rpmlimflug.de |
| Bore | 66 mm / 2.60 inch |
| Stroke | 40 mm / 1.57 inch |
| Displacement | 548 cm³ / 33.44 in³ |
| Configuration | 4‑cylinder, horizontally‑opposed, 2‑stroke |
| Cooling Method | Air‑cooled |
| Ignition System | Solid‑state magneto ignition |
| Firing Order | Two opposite cylinders fire simultaneously, 180° offset |
| Carburetor | 2 diaphragm‑type all‑position carburetors (no choke) |
| Crankcase | Aluminum alloy casting |
| Crankshaft | Drop‑forged 7‑piece assembly |
| Piston | Cam‑ground, cast aluminum alloy |
| Cylinder | L‑Nickasil coated aluminum alloy barrel |
| Dry Weight | Approx. 18.3 kg |
| Fuel | Unleaded 95‑gasoline or 100LL aviation gasoline |
| Lubricant | 1:50 fully‑synthetic 2‑stroke oil |
| Starter | Optional accessory |
| Generator | Not included (optional upgrade) |
| Optional Parts | Exhaust manifold, 24V‑0.5 kW starter, 28V‑1.2 kW generatorLimbach |
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
1
>>
Heavy‑lift VTOL industrial drone
2
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Unmanned helicopter platform
3
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Surveillance & mapping UAV
4
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Patrol & monitoring airborne systems
5
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
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.
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.
Carburetor adjustment
Two diaphragm carburetors, no choke structure. Need professional calibration according to altitude and working environment.
Mounting requirement
Need vibration‑damping mounting pads. Strictly follow official installation torque requirements for crankcase and cylinder bolts.
Ignition check
Dual‑cylinder simultaneous ignition with 180° phase difference. Check ignition timing before first test run.
Break‑in period
New engine requires strict running‑in procedure, cannot run full power continuously in initial hours.
FAQ
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.
Q: Two installation modes supported?
A: Yes, both pusher‑type and tractor‑type mounting are available.
Q: What is dry weight of DL550E?
A: Dry weight is approximately 18.3 kg.
Xpert Intelligent Equipment Co., Ltd. is one of the most experienced limbach l550e engine manufacturers and suppliers in China, also supports customized service. Please feel free to wholesale bulk discount limbach l550e engine in stock here from our factory. Quality products and reasonable price are available.
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