Chinese UAV/UCAV development

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Strangelove

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Domestic combat drone gets upgrade​


By ZHAO LEI | CHINA DAILY | Updated: 2022-08-18 09:15
62fd92bca310fd2bec9cb5fb.jpeg
A Caihong-4 unmanned combat aircraft. [Photo provided to CHINA DAILY]

The Caihong-4, China's top-selling unmanned combat aircraft, will soon have a more powerful engine that is expected to greatly improve its operational capability, according to its maker.

The China Academy of Aerospace Aerodynamics in Beijing, a subsidiary of China Aerospace Science and Technology Corp, said in a news release on Wednesday that a prototype equipped with a new type of heavy-fuel piston engine has recently completed all required tests to verify the drone's autonomous takeoff and landing, load capacity, flight ceiling and radius, as well as other functions.

The successful completion of the test flights confirmed that the upgraded drone is ready for operational deployment. The new version can be deployed on plateaus and islands and will also prove useful in civilian operations such as providing a signal relay in emergencies, extinguishing forest fires and obtaining data for city authorities, the academy said.

The Beijing-headquartered academy is one of China's top military drone exporters. The Caihong-4, popularly known as the CH-4, has been sold to 10 countries, making it the most popular combat-proven drone the country has exported, according to statistics from the academy.

Shi Wen, chief designer of the Caihong, or Rainbow, series, said that CH-4s now in active service are propelled by gasoline engines, while the new version runs on either diesel or kerosene.

"The new engine is the product of a private Chinese company, which owns the full intellectual property rights. It features world-class technologies, greater power, increased reliability and lower fuel consumption and can be used in tough environments," Shi said on Wednesday.

"Equipped with the new engine, the upgraded CH-4 is capable of staying longer in its target airspace, flying further and higher, and carrying more weapons and equipment," he explained.

The new CH-4 will be put on the market as early as next year.

Information from the academy shows that the current model can stay in the air for up to 30 hours on a single task. It has a maximum speed of 230 kilometers per hour, but usually operates at cruising speeds from 150 to 180 km/h.

With a maximum takeoff weight of 1.33 metric tons, it can carry nearly 350 kilograms of weapons and equipment including missiles, bombs, radars, cameras and various civilian payloads.

The drone has accumulated more than 20,000 hours of flight time from users around the world, the academy said.
 

by78

General
Cross-posting from the engine development thread because this is significant news for China's UAVs...

The "Golden Eagle", China's first indigenous heavy-fuel piston engine. It was developed by a private company. It's a liquid-cooled, eight-cylinder, four stroke design rated at 600KW and features
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.

Some specs:
- Fuel types: Diesel, RP-3/RP-5
- Maximum Continuous Power/RPM: 805hp @ 4000rpm
- Minimum Specific Fuel Consumption: 220g/kW-hour
- Weights: 515kg (aviation version), 650 (ground version)
- Dimensions: 1205x1185×849mm
- Time Between Overhauls: 2000 hours
- Max operating altitude: 10000m
- No power loss at altitudes at or below 4500m
- Suitable for heavy long-endurance UAVs, light helicopters, fixed-wing general aviation aircraft, etc.

52292742982_6388fd76ab_o.jpg
 

tankphobia

Senior Member
Registered Member
Cross-posting from the engine development thread because this is significant news for China's UAVs...

The "Golden Eagle", China's first indigenous heavy-fuel piston engine. It was developed by a private company. It's a liquid-cooled, eight-cylinder, four stroke design rated at 600KW and features
Please, Log in or Register to view URLs content!
.

Some specs:
- Fuel types: Diesel, RP-3/RP-5
- Maximum Continuous Power/RPM: 805hp @ 4000rpm
- Minimum Specific Fuel Consumption: 220g/kW-hour
- Weights: 515kg (aviation version), 650 (ground version)
- Dimensions: 1205x1185×849mm
- Time Between Overhauls: 2000 hours
- Max operating altitude: 10000m
- No power loss at altitudes at or below 4500m
- Suitable for heavy long-endurance UAVs, light helicopters, fixed-wing general aviation aircraft, etc.

More details ...

Please, Log in or Register to view URLs content!

Domestic combat drone gets upgrade​


By ZHAO LEI | CHINA DAILY | Updated: 2022-08-18 09:15
62fd92bca310fd2bec9cb5fb.jpeg
A Caihong-4 unmanned combat aircraft. [Photo provided to CHINA DAILY]

The Caihong-4, China's top-selling unmanned combat aircraft, will soon have a more powerful engine that is expected to greatly improve its operational capability, according to its maker.

The China Academy of Aerospace Aerodynamics in Beijing, a subsidiary of China Aerospace Science and Technology Corp, said in a news release on Wednesday that a prototype equipped with a new type of heavy-fuel piston engine has recently completed all required tests to verify the drone's autonomous takeoff and landing, load capacity, flight ceiling and radius, as well as other functions.

The successful completion of the test flights confirmed that the upgraded drone is ready for operational deployment. The new version can be deployed on plateaus and islands and will also prove useful in civilian operations such as providing a signal relay in emergencies, extinguishing forest fires and obtaining data for city authorities, the academy said.

The Beijing-headquartered academy is one of China's top military drone exporters. The Caihong-4, popularly known as the CH-4, has been sold to 10 countries, making it the most popular combat-proven drone the country has exported, according to statistics from the academy.

Shi Wen, chief designer of the Caihong, or Rainbow, series, said that CH-4s now in active service are propelled by gasoline engines, while the new version runs on either diesel or kerosene.

"The new engine is the product of a private Chinese company, which owns the full intellectual property rights. It features world-class technologies, greater power, increased reliability and lower fuel consumption and can be used in tough environments," Shi said on Wednesday.

"Equipped with the new engine, the upgraded CH-4 is capable of staying longer in its target airspace, flying further and higher, and carrying more weapons and equipment," he explained.

The new CH-4 will be put on the market as early as next year.

Information from the academy shows that the current model can stay in the air for up to 30 hours on a single task. It has a maximum speed of 230 kilometers per hour, but usually operates at cruising speeds from 150 to 180 km/h.

With a maximum takeoff weight of 1.33 metric tons, it can carry nearly 350 kilograms of weapons and equipment including missiles, bombs, radars, cameras and various civilian payloads.

The drone has accumulated more than 20,000 hours of flight time from users around the world, the academy said.

52292742982_6388fd76ab_o.jpg
So with this new development the CH-4 is basically matching in capabilities to contemporary US HALE UAVs while being entirely domestic.

Enlighten me if I'm ignorant, an US Gray eagle drone has a heavy oil engine Centurion 1.7 that produces 165 HP but for the golden eagle engine the stated power is 805 HP, this vast level of difference between power nets two uavs that are very similar in performance and payload, what gives?

Fun side fact: the Centurion 1.7 is produced by technify motors, which was brought out by AVIC in 2013. So you have American drones flying on engines made by a Chinese subsidiary.
 

taxiya

Brigadier
Registered Member
So with this new development the CH-4 is basically matching in capabilities to contemporary US HALE UAVs while being entirely domestic.

Enlighten me if I'm ignorant, an US Gray eagle drone has a heavy oil engine Centurion 1.7 that produces 165 HP but for the golden eagle engine the stated power is 805 HP, this vast level of difference between power nets two uavs that are very similar in performance and payload, what gives?

Fun side fact: the Centurion 1.7 is produced by technify motors, which was brought out by AVIC in 2013. So you have American drones flying on engines made by a Chinese subsidiary.
Firstly, I am not sure if the new engine on CH-4 is this 600kw engine. This 600kw engine was mentioned 2 years ago as the engine for CH-5 which is double the size of CH-4. It would be strange that CH-4 got this engine two years after CH-5. On the other hand, the latest development from the engine company is a 300kw version which seems to be more reasonable for CH-4, although it is still more than double the power of Centurion.

Secondly, engine power is a product of altitude (oxygen density). The higher it goes, the lower the output. MQ-1C operation ceiling is 8839 meters. The 300kw engine (CH-4) operates up to 6000m without power loss, and 12000m at lower power output. So CH-4 can carry similar payload for similar range as MQ-1C but at much higher altitude.

600kw engine first fire 2020-02, CH-5 reported to fly with heavy fuel engine 2020-11.
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300kw engine first fire 2021-06
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IWAN2022

Just Hatched
Registered Member
Cross-posting from the engine development thread because this is significant news for China's UAVs...

The "Golden Eagle", China's first indigenous heavy-fuel piston engine. It was developed by a private company. It's a liquid-cooled, eight-cylinder, four stroke design rated at 600KW and features
Please, Log in or Register to view URLs content!
.

Some specs:
- Fuel types: Diesel, RP-3/RP-5
- Maximum Continuous Power/RPM: 805hp @ 4000rpm
- Minimum Specific Fuel Consumption: 220g/kW-hour
- Weights: 515kg (aviation version), 650 (ground version)
- Dimensions: 1205x1185×849mm
- Time Between Overhauls: 2000 hours
- Max operating altitude: 10000m
- No power loss at altitudes at or below 4500m
- Suitable for heavy long-endurance UAVs, light helicopters, fixed-wing general aviation aircraft, etc.

52292742982_6388fd76ab_o.jpg
You are wrong. The new engine on CH-4 is this 118kw /153hp " laverock/skylark "engine.
Some specs:
- Fuel types: Diesel, RP-3/RP-5
- Maximum Continuous Power/RPM: 153hp @ 4000rpm
- Minimum Specific Fuel Consumption: 220g/kW-hour
- Weights: 105kg, 112kg (+deceleration box))
- Dimensions: 712x706×643mm
- Time Between Overhauls: 2000 hours
- Max operating altitude: 10000m
- No power loss at altitudes at or below 4000m
- Suitable for heavy long-endurance UAVs, light helicopters, fixed-wing general aviation aircraft, etc.
CH4  engine 截图20220819020052.png
 

taxiya

Brigadier
Registered Member
You are wrong. The new engine on CH-4 is this 118kw /153hp " laverock/skylark "engine.
Some specs:
- Fuel types: Diesel, RP-3/RP-5
- Maximum Continuous Power/RPM: 153hp @ 4000rpm
- Minimum Specific Fuel Consumption: 220g/kW-hour
- Weights: 105kg, 112kg (+deceleration box))
- Dimensions: 712x706×643mm
- Time Between Overhauls: 2000 hours
- Max operating altitude: 10000m
- No power loss at altitudes at or below 4000m
- Suitable for heavy long-endurance UAVs, light helicopters, fixed-wing general aviation aircraft, etc.
View attachment 95703
I highly doubt. As I said in #5,556, the power output will reduce a lot at higher altitude. The 118kw is only up to 4000 meters. Above that you won't get 118kw.

BTW, did you get your conclusion from report like this?
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You can see that in the article, both 118kw and 600kw engines were mentioned. The article did not acertain which one of them being used by CH-4.
 
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