Chinese UAV/UCAV development

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plawolf

Lieutenant General
It says that the temporary UAV base station managed to connect 2572 users.
That’s not all that many users. Is that the maximum capacity of the base station, or are they maybe limiting access to emergency services and military personnel with passcodes and that’s how many such people connected in the disaster area?
 

by78

General
That’s not all that many users. Is that the maximum capacity of the base station, or are they maybe limiting access to emergency services and military personnel with passcodes and that’s how many such people connected in the disaster area?

It's for emergency and other authorized personnel only, basically a communications network for disaster relief purposes only. The drone has a direct real-time satellite link with China's Emergency Management Command Center, so it can also patch emergency personnel through to the command center.
 

siegecrossbow

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It says that the temporary UAV base station managed to connect 2572 users.

I sense a lot more orders coming for this variant of Wingloong…

On a related note, Typhoon In-fa and Cempaka may make a landfall along the eastern coast of China. Should there be wide scale destruction (which I hope won’t happen) Wingloong will need to be used once again.
 

Volpler11

Junior Member
Registered Member
Thanks, yes thats the thing that had me mystified as well. PLA did report one cargo flight back in 2019. Maybe they are super technical about "first flight" here for a particular config of this drone but all in all I do wonder.
This appears to be a different model developed by AVIC called Y-5U and the previous one was developed by CASC called FH-98. I guess the claim of the largest general-purpose UAV is still true if it is exactly the same size as the previous record holder. But just seems to be less impressive now.
 

lcloo

Captain
I wonder if they could make the drone safe enough for transporting people. It already has the layout and space suitable for the task.
I think that shall not be any problem. The unmanned Y5-U and FH-98 are both derivative of Y5 light transport that is still in PLAAF service for paratrooper parachute jumping training.

Y-5 transport is based on AN-2, first appeared in 1947, and more than 18,000 aircrafts of different variants were built in Soviet Union/Russia and China. Y5 is also one of the most safest plane in the World.

Y-5 was chosen as a base for the large transport UAV is probably due to it's safety record. It is said the aircraft practically has no stall speed and capable of descending (gliding) speed as low as 40mph..

The An-2 has no
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speed, a fact which is quoted in the operating handbook. A note from the pilot's handbook reads: "If the engine quits in instrument conditions or at night, the pilot should pull the control column full aft and keep the wings level. The leading-edge slats will snap out at about 64 km/h (40 mph) and when the airplane slows to a forward speed of about 40 km/h (25 mph), the airplane will sink at about a parachute descent rate until the aircraft hits the ground."
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As such, pilots of the An-2 have stated that they are capable of flying the aircraft in full control at 48 km/h (30 mph) (as a contrast, a
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four-seater light aircraft has a stall speed of around 80 km/h (50 mph)).[
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] This slow stall speed makes it possible for the aircraft to fly backwards relative to the ground: if the aircraft is pointed into a headwind of roughly 56 km/h (35 mph), it will travel backwards at 8 km/h (5 mph) whilst under full control.
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- Gordon,Yefim & Komissarov, Dmitry. “Antonov An-2”. Midland. Hinkley. 2004.
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lcloo

Captain
That’s not all that many users. Is that the maximum capacity of the base station, or are they maybe limiting access to emergency services and military personnel with passcodes and that’s how many such people connected in the disaster area?
According to the message from China Mobile, one of the major telecom service provider, it read as follwing:-
"To people of Mihe town, the Emergency Service Dept has sent a Wingloon UAV to the sky above your town, China Mobile messaging service (SMS) has been restored. The UAV has limited loitering time, the messaging service are in service for 5 hours only, pls report your situations ASAP, and contact your family. Be safe."

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siegecrossbow

General
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According to the message from China Mobile, one of the major telecom service provider, it read as follwing:-
"To people of Mihe town, the Emergency Service Dept has sent a Wingloon UAV to the sky above your town, China Mobile messaging service (SMS) has been restored. The UAV has limited loitering time, the messaging service will be in service for 5 hours, pls report your situations ASAP, and contact your family. Be safe."

View attachment 75034
It is refreshing to see one of these long-endurance UCAVs used for something that's not bombing related.
 

Kaine

Junior Member
Registered Member
Does anyone know why the WL(2?) has such a limited loitering time of only 5 hours when in the official WL2 specs on Wikipedia say that it has an endurance time of 32 hours?
 

siegecrossbow

General
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Does anyone know why the WL(2?) has such a limited loitering time of only 5 hours when in the official WL2 specs on Wikipedia say that it has an endurance time of 32 hours?

It flew all the way from Guizhou to Henan because there is only one prototype available. Also, loitering time is dependent on payload. 32 hours is for surveillance missions. If the drone is carry weapons or in this case, communication device, loitering time is lower.
 

crash8pilot

Junior Member
Registered Member
Does anyone know why the WL(2?) has such a limited loitering time of only 5 hours when in the official WL2 specs on Wikipedia say that it has an endurance time of 32 hours?
32 hours is somewhat of a misleading figure. From a flight planning perspective one has to take into account the altitude in which the loitering occurs because the lower the altitude, the higher the fuel burn.... and vice versa. I imagine the WL2 would have to fly lower than optimum cruising altitude in order to provide signal to ground equipment, and therefore it'll burn significantly more fuel as compared to cruising at optimum altitude (probably around 25,000 to 30,000 feet) that might give the 32 hours stated on Wiki. I'm basing this assumption purely from my own experience where I "forget" to turn off airplane mode on my phone, and my notifications start kicking off once descending through ~10,000 feet because it starts receiving signal from cell towers on the ground. 32 hours is also derived from flying at optimum cruise altitude but at maximum endurance speed (in other words, that's hella slow), I'm sure the drone operators won't be flying from Guizhou to Henan at such low speeds when they're trying to save lives.

Also adding onto what @siegecrossbow said, using some gross error maths here - cruising at ~300 knots True Air Speed at altitude and its still roughly a 2 hour trip each way between Guizhou and Henan. So we ought to have to take into account 4 hours from the quoted 32 hour loitering figure, and why the WL2 might have a limited time on station of "just" 5 hours. I don't know how it works in the drone UAV world, but from a commercial and civil aviation aspect we always flight plan for fuel reserves (roughly speaking fuel needed to divert to alternate airport, and an additional 45 minutes holding fuel). I can't see why it'd differ in the drone UAV world, but none the less 32 hours endurance doesn't take fuel reserves into account.
 
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