asif iqbal
Banned Idiot
KJ-700 should be a advanced AWACS
hope to see more of these
hope to see more of these
PLA AEW&C, SIGINT, EW and MPA thread
- Thread starter Sczepan
- Start date
sadly no. Nonetheless the baseline B-737NG for E-7 was having about 180 KW
While Y-9 baseline using the WJ-6 series, kinda hard to find. Original AL-20 tho came in with SGO-12 electrical generator with capacity of 12 KW
So 180 KW vs 48 KW
Tho i expect the KJ-500 would be using larger rating generator as i dont see how 48 KW can realistically support the AEW payload system. APU might be installed but, APU also rob the fuel from the engine thus may somehow cut the endurance.
-- Maybe for illustration. Suppose an AEW payload, each TRM can emit some 100 Watt peak power and 20 Watt average (duty cycle of 20%). PAE (power added efficiency) is 33% assuming A-class amplifier for signal purity. the AEW is L-band with 800 TRM. each TRM is then consuming about 20/.33 = 60 Watt. Multiply that with 800 yield 48000 Watt or 48 KW per face. KJ-500 have 3 faces, thus If all got energized then about 144 KW are needed which termed as "Antenna load". Electronics like consoles etc are usually no more than 20% of the antenna load or about 28.8 KW. Thus the "AEW payload" would need about 172.8 KW.
Thus the engine generator should be making about 55 KW or 60 KW, for total power generation capability of 240 KW. That will cover the AEW payload and the baseline electrical power need for the aircraft.
it's crazy how 1911 era fan propeller tech is still being used for our AEWC, meanwhile other countries are using proper jet engines for ages.
its better to speed up the integration of adding the frying pan to the roof of Y20B soon, or in the future, on the C939.
its better to speed up the integration of adding the frying pan to the roof of Y20B soon, or in the future, on the C939.
Turboprops are more efficient than large bypass turbofans for low speed cruising something that is optimal for AEWC aircraft and alot of new designs still use turboprop(ie. A400M and very likely the upcoming Y-30 medium transport), though you are right about the Y-9 being an antique and inefficient platform compared to B737. But the issue with B737 and other commercial plane based AEWC aircraft is that it lacks certain "creature comforts" that come with tactical transports such as short field and rough airfield compatibility. Also, FYI KJ-3000 is already flying, it's a Y-20B based heavy AEWC aircraft. KJ-500 and its successor KJ-700 doesn't really need the range and endurance of western AEWC aircrafts IMO since PLAAF/PLAN seems to use them as tactical AEWC meant to provide cover over Chinese airspace or near Chinese mainland ie the SCS. KJ-3000 seems to be more similar to western AEWC aircrafts such as E-3 Sentry as it meant to have long range and long endurance for expeditionary missions.
As for a super heavy AEWC based on C939 and/or an ultra heavy super AEWC based on a 600t class transport like that paper suggested seems IMO somewhat unnecessary unless PLAAF really needs a AEWC that can basically single handedly surveil the airspace of a country and have global range with no/minimal refueling, biggest issue with stuff like this is that a single such aircraft would probably cost an arm and a leg even for the PLA that I'm not sure if its economically viable over building multiple smaller AEWC aircrafts. But feel free to surprise me a super AEWC seems like an interesting concept.
On a side note, has there been any news regarding KJ-700? So far only the PLAN has been seen operating this type of aircraft is it possible that this aircraft would be naval only? If there is an Airforce KJ-700 will it come with a refueling probe like the KJ-500A?
Turboprops aren't inferior to turbofans. They have their own uses and they are turbine powered too. They are capable of shorter take off runs and longer ranges. The speed of the KJ-3000 will be useful for operations beyond the first island chain as it will keep up with the fighters better.
Chinese Engine Development
Just to add on - The paper is co-authored by the chief designer of WZ-9, Academician Yin Zeyong of the Chinese Academy of Engineering. In particular, this paragraph from the paper: So to put it simply, the following aircrafts are to be powered by their respective engines: C919 -...
www.sinodefenceforum.com
Note: Most US AEW aircraft are turboprops. There are more E-2s than the E-3s.
lcloo
Major
"it's crazy how 1911 era fan propeller tech is still being used for our AEWC, meanwhile other countries are using proper jet engines for ages."
There is a piston engine powered propeller technology but this is not used on Y9 based AEWC, instead the KJ-200/500/600/700 use turbo-prop engine in which a gas turbine is used instead of piston engine.
Turbo-prop engine has the similar history timeline as the jet engine. In fact the world's first jet engined ME323 was already operational in 1943, 5 years before the first turbo-prop Vickers Viscount.
"The first operational turboprop-powered aircraft was a modified Gloster Meteor fighter, fitted with two Rolls-Royce RB.50 “Trent” turboprop engines. This aircraft took flight in 1945, marking the beginning of turboprop aviation. However, it never entered production.
The first commercial airliner to use turboprop power was the Vickers Viscount, introduced in 1948. It was equipped with four Rolls-Royce Dart turboprop engines and became well-regarded for its smooth and efficient flight."
There is a piston engine powered propeller technology but this is not used on Y9 based AEWC, instead the KJ-200/500/600/700 use turbo-prop engine in which a gas turbine is used instead of piston engine.
Turbo-prop engine has the similar history timeline as the jet engine. In fact the world's first jet engined ME323 was already operational in 1943, 5 years before the first turbo-prop Vickers Viscount.
"The first operational turboprop-powered aircraft was a modified Gloster Meteor fighter, fitted with two Rolls-Royce RB.50 “Trent” turboprop engines. This aircraft took flight in 1945, marking the beginning of turboprop aviation. However, it never entered production.
The first commercial airliner to use turboprop power was the Vickers Viscount, introduced in 1948. It was equipped with four Rolls-Royce Dart turboprop engines and became well-regarded for its smooth and efficient flight."
by78
General
Username checks out.
