550 Horizontally Opposed Four-Cylinder 2-Stroke Air-Cooling Gasoline UAV Engine

Note: In order to better use the engine, Please read this manual carefully before starting the engine. Any modification or improper operation may result in a serious accidents, if so we will not be responsible for any safety issues for it. Please pay attention to safety when using this engine.

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NGH Engine

GTF550 four-cylinder horizontally opposed two-stroke air-cooling gasoline engine is specially designed by NGH engineers for drones, powered parachutes and ultra-light experimental aircraft. The novel circulating cooling water channel, unique idling energy-saving back-spraying device and classic perfect structural design make the engine have little vibration, power, light weight and long life. The fast throttle response achieves perfect power linear output, providing you with a stable and abundant power for your aircraft, giving you an unprecedented flight experience.

Please read this manual carefully before starting the engine. This manual will give you basic information about the security operations of the engine.

Warning!

If you are buying this type of engine for the first time and trying to complete your flight with your own personal abilities, stop your dangerous behavior immediately and seek the help of an experienced person.

Improper use and maintenance may result in damage to the engine and may result in death or death. Improper use and maintenance may result in engine damage, as well as life and property casualties. The installation, test and maintenance of the engine should be entrusted to experienced personnel. NGH is not responsible for any loss caused by improper operation and maintenance!

The engine is used for aircraft that do not need to obtain an airworthiness certificate. Unexpected parking may occur during use, and users need to have emergency measures to deal with the flight shutdown. NGH does not bear any loss caused by accidental parking in the flight!

NGH don’t assume product liability insurance. We can't guarantee that there is not any equipment malfunction. There are risks to use it. Accidents may cause loss of life or property, or even death. If you are not willing to bear all the risks in use, please do not start the engine!

* Security Information

* Installation, debugging and maintenance should be performed by personnel who have known and used this type of engine, and have read this manual in detail, and accept the risks mentioned in this manual.

* The engine is not certified for airworthiness and must be used in accordance with the laws and regulations of the relevant countries.

* Any engine may accidentally shutdown and may cause serious accident or death. The manufacturer does not bear the loss caused by the engine shutdown.

* Do not operate in small enclosed areas or in places where is a storage area for flammable and explosive materials when mixing fuel or refueling engines.

* Turn off the engine before refueling and clean it immediately if there is any fuel spill.

* The manufacturer is NOT responsible for the engine damage caused by incorrect engine mounting and incorrect use of fuel, lubricants.

* It is forbidden to start the engine under no-load conditions, which may cause the engine to overspeed or explode.

* Before starting the engine, you need to check the engine routinely. For example, if the mounting screws of each component are loose,if the throttle control cable and the tie rod are worn and whether the electrical circuit part works normally, to ensure that all operations are normal.

* It is forbidden to start the engine when the personnel environment is complicated and uncontrollable.

* It is forbidden to run the engine in an unsupervised environment.

* After the engine is started, the aircraft cannot be lifted off immediately. After the preheating, the throttle is added and decremented to observe whether the state is within the normal range. If abnormal vibration and noise occur, the engine should be shut down immediately to check.

* Do not run the engine over the maximum rated speed.

* When you shut down the engine, leave it at idle state for a few minutes to cool down.

* Regularly check engine mounts, propellers, fuel lines, lines, and air filters.

* Sensors can be installed outside the engine to monitor engine temperature and speed. The installation equipment must be operated by personnel with relevant technical experience. The manufacturer will not be liable for engine damage caused by improper modifications.

* The use of non-NGH original accessories will invalidate the warranty for the engine.

* Keep engine running log, including engine working time, maintenance record, fuel and lubricating oil label information.

* Follow the engine's maintenance instructions to keep the engine in optimal working condition.

The engine parameter

Type	GTF550
Bore X Stroke	58mm x 52mm
Displacement	550ml (4 x 137.32ml)
RPM Range	800-7000rpm
Recommended propeller	30x25,32x20,33x20(Two-blades)
Maximum power	47HP / 6500RPM
Maximum Torque	42N.M / 5000RPM
Static tensile force	180kg
Generator output	DC28V,1000W/5500rpm
start-up mode/ starting voltage	Electric start /22.2V (6S)
Weight of Generator	2KG
Fuel consumption rate	523g/kw.h
Weight of engine EFI version fuel pump weight EFI version ECU weight	16.5KG 403g 128g
Climb limit altitude	5000m
Temperature range	-30°C-60°C
TBO	300h
Fuel	95#+FD Level total synthesis 2T Lubricating oil
Mixing ratio (volume ratio)	40:1

The Use of Engine

* All the mounting screws of the engine need to be coated with the thread adhesives (Kafuter K243). The engine box body, the box body and the cylinder block sealing surface are designed with no gasket. Evenly, the Kafuter silicone rubber (K383) is applied to the sealing surface. The bearing cylindrical mounting surface is evenly coated with a retaining agent (Loctite 609). When the same mounting surface exceeds 4 screws, the diagonal cross is evenly tightened.

* Proper vibration damping should be done when the engine is installed on the aircraft. The fixing bolts are made of M10 high-strength bolts. The nuts used should be self-locking locknuts to ensure that the engine is balanced on the mounting surface.

* The battery should be connected to the circuit after all the lines are connected to avoid injury caused by accidental starting.

* The AC output from the permanent magnet generator is rectified and regulated, and the output is 28V DC .

* The ratio of gasoline to lubricating oil is 40:1. Adjust the mixing ratio and high-speed oil needle according to the ambient temperature and engine temperature. When the temperature is high, please increase the proportion of oil and increase the high-speed oil needle opening.

* It is forbidden to mix and match the lubricating oils of different manufacturers and grades, otherwise it will cause serious clogging of the carburetor; the carburetor needs to be cleaned when replacing the lubricating oil; do not use the fuel that has been mixed for more than 3 weeks. The blended fuel will be precipitated in the winter, so mix it evenly before use.

* Check the engine and its accessories for any abnormalities before starting the engine.

* When starting the engine, first close the choke valve, the throttle is placed in the idle position, open the pressure reducing valve, press the start button, the starter motor drives the engine to turn the oil, and the engine will blast when the carburetor enters the oil. Open the choke, the throttle is placed in the idle position,open the pressure reducing valve again, press the start button, and the engine enters the idle state after the engine is started (Please warm the car for 2-5 minutes after the winter start, and warm the car for 1-2 minutes after the start of the summer to check the check. The engine's idle stability and the throttle control of the throttle.

Electrical System Installation

* The GTF550 engine adopts an NGH automatic angle ignition device for ignition. The AC power output from the permanent magnet generator is rectified and stabilized to DC 28V through a voltage regulator and charge for the battery.

* The battery is connected to the circuit after all the lines are connected to avoid the damage caused by accidental start.

* The diameter of the wire that starts the motor circuit is not less than 6mm². Try to keep the wires connected to each other as short as possible. Do not use wires with too small wire diameter. If the wire is too long or the wire diameter is too small, the voltage will drop too much and the engine will not start.

* Buy a reliable switch to achieve start and stop.

* Bundle and fix the wires. Avoid the high-temperature components as much as possible to avoid long-term friction between the wires and the components caused by vibration. All the waterproof butt plugs are inserted.

* The original engine spark plug (single sheet metal BPMR6A) has been tested. Switching to other types of spark plugs may cause engine failure due to differences in spark plug heat values.

* When installing the spark plug, ensure that the surface of the spark plug is clean and dry. Hold the spark plug ceramic part, align the tapped hole of the spark plug to the bottom, and then install the spark plug in place with a torque wrench (torque 23N.m).

Engine Start

Before starting the engine, check whether the engine, rotating parts and other accessories are abnormal. Turn off the choke, add the throttle to the maximum, turn on the ignition, press the pressure reducing valve, press the start button, and start the motor to drive the engine. After the oil is introduced into the oil, the engine starts and the oil is turned off. The damper is opened, the throttle is reduced to the idle position, the pressure reducing valve is pressed, the start button is pressed, the engine is started to enter the normal working state; after the winter start, the vehicle should be warmed up. 2-3 minutes, after the start of summer, warm the car for 1-2 minutes, check the idle speed stability of the check engine and increase or decrease the throttle response.

Note: The single boot time does not exceed 8 seconds. After the boot fails, it should be restarted after 30 seconds. If the startup fails several times in the event that the carburetor has been oiled, the engine needs to be inspected.

Engine Cooling

A proper cooling system is essential for any engine, and engine cooling requires properly sized air intakes.In order to ensure cooling during engine operation, the air outlet should be five times the size of the cold air intake.

It is highly recommended to blow cold air directly onto the cylinder when the engine is cooling, and the cold air flows directly through the heat sink of the cylinder, which will provide the best cooling effect for the engine.

Engine running in

* The engine is well worn to extend the service life. The NGH engine is factory set to ensure normal engine start.

* Carburetor oil needle factory state L: 1 circle H: 1.5 laps.

* Do not fasten the engine to the bracket without the damping device for running-in.

* It is forbidden to start the engine without a standard propeller installed.

* The engine running-in should be carried out in an environment that is spacious and ventilated, free of dust and debris, and does not affect the safety of others. The running-in engine must be firmly fixed on the engine frame with the shock absorber, and the engine frame is firmly fixed on the test bench or the aircraft.

* Engine running-in is recommended under the guidance of an experienced person.

* Low speed running-in: fuel ratio 40:1

Start the engine and keep the speed running at 2500-3500 rpm for 30 minutes. During the period, you can stop the cooling several times and check if the engine working condition is normal.

* Medium speed running-in: fuel ratio 40:1

Start the engine and keep the speed running at 3500-4500 rpm for 60 minutes. During the period, you can stop the cooling several times and check if the engine working condition is normal.

* Low, medium and high speed intermittent running-in: fuel ratio 40:1

Start the engine to warm up for 2 minutes, run at a speed lower than 4000 rpm, increase the throttle by about 10 minutes, and keep the time of the first 5 times of the large throttle within 10 seconds. If the engine acceleration and deceleration is normal, continue at low speed and medium speed. In the state, the full throttle is added once every 5 minutes, and the time of continuous full throttle is gradually extended to 5 minutes. Each full throttle end needs to be reduced to idle speed for 1 minute; the running-in time is 90 minutes, and the carburetor can be used during this period. Fine adjustment is made, and the engine in the normal state after running-in is stable and the acceleration and deceleration are smooth.

* After the ground is run for more than 3 hours, check that all components are normal and the engine is in good working condition.

Engine operation and maintenance instructions

* Use the recommended propeller 32x20. When the propeller is not installed, it is forbidden to start the engine. It is forbidden to use the broken propeller. The mismatch of the propeller will shorten the life of the engine.

* It is strictly forbidden to stand in the range of 50 meters from the plane of rotation of the propeller.

* Check the engine's idle stability and acceleration/deceleration continuity after each engine is started and the engine is warmed up.

* If there is abnormal sound or vibration during the use of the engine, you should immediately drop the parking check and continue to use it after troubleshooting.

* If the engine suddenly stops in the air, please look for a place to land safely as soon as possible.

* Keep the engine surface clean to ensure that the engine is well cooled.

* Avoid using the engine in a dusty environment. Clean the air filter with a compressed air gun every 20 hours.

* Clean the fuel filter and needle valve in the carburetor according to engine conditions, otherwise the engine will be unstable.

* Check that all screws are loose after every 20 hours of use, and that the tubing, and wiring are abnormally worn.

* Check the condition of the spark plug. If you need to replace the spark plug, please use the original accessories. Inappropriate spark plug models may cause engine damage.

* Airspace should be replaced every 100 hours of use.

* Regularly check and clean the carbon deposits on the cylinder and piston surface. Apply the high temperature sealant to the end face when assembling the cylinder.

* The reed valve of the carburetor is a consumable and consumable part. After 30 hours of use, periodically check whether the periphery of the reed valve connected to the carburetor manifold is worn to affect the seal. If it is severely worn, it should be replaced.

Note: It is necessary to record each repair in the maintenance record.

Spark plug color to determine whether the oil and gas mixture is burning enough

Start the engine, full throttle operation for 30 seconds, turn off the flame at high speed, remove the spark plug, observe the center electrode of the spark plug, the center electrode is dark brown and the oily part of the thread is slightly wet, indicating that the oil and gas mixture is fully burned, and the blackening of the center electrode indicates that the engine works. In the rich state, the center electrode whitish indicates that the engine is operating in a lean state.

Troubleshooting

* The engine can't start: first check the circuit, make sure the spark plug is in place, remove the spark plug, rotate the engine crankshaft, and watch the spark plug electrode jump between the spark plugs; if there is no flashover, please check the circuit between the magneto and the high voltage package; The problem of the oil road.

* When removing the spark plug, if the spark plug is full of oil stains, it may be that the carburetor supplies too much oil to cause the tank to be flooded. After the spark plug is wiped clean, put it back and restart it; if the spark plug is dry, there is a problem with the oil supply system, please Check if the oil passage between the fuel tank and the carburetor is blocked and if the inside of the carburetor is clogged.

Warranty

This product is warranted for one year from the date of purchase. Please contact our authorised distributor for warranty.

Consumables such as spark plugs, and air filters are not covered by the warranty.

Warranty does not include: normal engine wear and tear; damage caused by improper maintenance; use of small propellers to cause damage caused by engine overspeed; bearing rust; crash; use of unsuitable fuel; damage caused by foreign objects; unreasonable installation or operation Damage caused by the environment; damage caused by improper disassembly; damage caused by any modification.

The product cost sharing during the warranty period: The domestic user shall bear the return shipping cost within three months from the date of purchase. The shipping cost will be borne by the user after more than three months.

Accessories list

Number	Name	Item number	Quantity
1	CDI	NGH automatic Angle igniter ignition	1set
2	Spark plug	BPMR6A	4pcs
3	stabilized rectifier	28V	1set