Product overview
The Hongfei GF38-GE is a four-stroke gasoline propulsion engine for RC aircraft, combining electric starting with power generation. Its intended aircraft application covers takeoff weights of 8-12kg. For installation space, it follows the size of a 160-240-class four-stroke glow engine and offers comparable power. Displacement is 37.97cc, with a 39mm bore and 31.8mm stroke. Recommended propeller options are 18*8-10, 19*8-10 and 20*8. The engine weighs 1310g, with exhaust and ignition weights specified separately as 19g and 105g.
The engine arrangement places the carburetor at the rear for easier adjustment and pairs a Walbro carburetor with a CNC-machined, adjustable T-shaped mount. A standard directional exhaust is intended to reduce noise, while the mount is intended to improve installation stability and reduce vibration. Internal construction includes a connecting rod with double needle roller bearings and two piston rings, separating lubrication and sealing functions. The wear-resistant ductile iron cylinder liner has an inner bore roundness tolerance within 0.01mm. Ignition equipment comprises RCEXL automatic-advance ignition and an RCEXL CM6 spark plug.
Operating specifications distinguish the ignition supply from the starting system: ignition uses DC 4.8V-8.4V, 1000mAh, while starting calls for at least 12V and current below 30A. The integrated generator delivers DC12V, 150W at 6000rpm and uses control without Hall sensing. Fuel combines 92# unleaded gasoline with fully synthetic 2T lubricant at 35: 1. Practical speed is 1800-8000rpm; output power is 3.58HP at 8300rpm, and the separate engine-power specification is 4.22HP / 3.58hp. Electrical machinery weighs greater than 250g, and the control and voltage stabilizing system weighs greater than 150g.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity | Hongfei GF38-GE four-stroke RC gasoline engine with electric starting and power generation |
| Displacement | 37.97cc |
| Bore | 39mm |
| Stroke | 31.8mm |
| Practical speed range | 1800-8000rpm |
| Output power | 3.58HP / 8300rpmAt 8300rpm. |
| Static thrust | 7.2kg |
| Fuel | 92# unleaded gasoline + fully synthetic 2T lubricant |
| Lubrication ratio | 35: 1 |
| Compression ratio | 9: 1 |
| Engine weight | 1310g |
| Exhaust weight | 19g |
| Ignition weight | 105g |
| Ignition power | DC 4.8V-8.4V 1000mAh |
| Spark plug type | CM-6 |
| Recommended propeller | 18*8-10, 19*8-10, 20*8 |
| Engine power | 4.22HP / 3.58hp |
| Integrated starting and power generation control | Sensorless control without Hall sensing |
| Electrical machinery weight | Greater than 250g |
| Control and voltage stabilizing system weight | Greater than 150g |
| Starting voltage | Not less than 12VDuring starting. |
| Starting current | Less than 30ADuring starting. |
| Generator output | DC12V, 150W / 6000rpmAt 6000rpm. |
| Installation size and aircraft application | Installation size and comparable power of a 160-240-class four-stroke glow engine; suitable for RC aircraft with 8-12kg takeoff weightsRC aircraft with takeoff weights of 8-12kg. |
| Directional exhaust | Standard directional exhaust pipe intended to reduce noiseStandard exhaust configuration. |
| Carburetor position | Rear-mounted carburetor for easier engine adjustment |
| Engine equipment and construction features | Matched Walbro carburetor; CNC-machined adjustable T-shaped engine mount intended to improve installation stability and reduce vibration; CNC-machined connecting rod with double needle roller bearings; RCEXL ignition with automatic advance; RCEXL CM6 spark plug; high-quality bearings |
| Piston ring architecture | Two piston rings: one lubricating oil ring and one sealing ring |
| Cylinder liner material and tolerance | Wear-resistant ductile iron cylinder liner; inner bore roundness tolerance within 0.01mmInner bore roundness tolerance. |
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