JH-7/JH-7A/JH-7B Thread

crobato

Colonel
VIP Professional
Re: JH-7/JH-7A Thread

The design of the JH-7A does not revolve around the J-8II at all. Both are very different aircraft, not just in design but philosophy.

JH-7A vs. J-8F

Double seater vs. single seater
Fixed intakes vs. variable intakes
compound swept wing vs. delta wing
shoulder mounted wing vs. bottom mounted wing
turbofan vs. turbojet
low altitude interdictor vs. high altitude interceptor
 

beijingcar

New Member
Re: JH-7/JH-7A Thread

for a strike fighter, the JH7 is a very conventional design for a lots of people. But for Chinese defence industry, and for the PLAAF, PLANAF, the JH7 is the first jet design that went away from the influence of Russian roots. There were a lots first on the JH7 for the Chinese ( first FBW jet designed and build in China, first jet for the Chinese with turbofan engine, first jet designed largely from the aid of computers). From JH7's first fly in 1988 till today with JH7A, they have steadily improved this jet to a point that the JH7A is both lighter ( therefore longer range) and a lot deadlier than the JH7. From test pilots reports that I have read, the JH7 is not much a fighter at all, too heavy, turn too slow, not enough power for most of the ACMs. but on the plus side, they rated this jet as very stable, very predictable in flight, good fuel economy( as compared to J7B I guess). So far I have not seen JH7 pilots with HMS, but I am sure the PLAAF and PLANAF can get these for the JH7 pilots if they want to. About 4 years ago, there was a news article in one of the major Japanese newpapers about a retired JSDF pilot who flew F4J off their Okinawa base, he remembered one day he and his wingman flew a pair of F4Js over the East China sea and met a pair of JH7's ( it has to be around year 1998-99, I think). He said that he was surprised how aggressive these PLANAF JH7 pilots are, the JH7 came straight at them ( F4j) at very high speed and together they have some close fun, then the F4J were bingo fueled and had to return base, and he said the JH7s did not seem want to end the fun( the diffeerence between a turbojet VS turbofan). So from this report, we can expect the JH7 can hold their own against a not so agile fighter ( in this case, a F4).
we have all seen the back seat of the JH7A, the layout sure is modern and a beauty for my eyes. I have not see the pictures of the front seat, but judging from the backseat, the front should not be that bad either.
 
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beijingcar

New Member
Re: JH-7/JH-7A Thread

The design of the JH-7A does not revolve around the J-8II at all. Both are very different aircraft, not just in design but philosophy.

JH-7A vs. J-8F

Double seater vs. single seater
Fixed intakes vs. variable intakes
compound swept wing vs. delta wing
shoulder mounted wing vs. bottom mounted wing
turbofan vs. turbojet
low altitude interdictor vs. high altitude interceptor

You are right on. If we have to point similarties in design, I would say, J8II is like product of cross breeding between Mig23 with Su15. As for JH7, Tornado is close in design but with a different wing.
 

crobato

Colonel
VIP Professional
Re: JH-7/JH-7A Thread

I look at the JH-7A and I see the closest contemporary to be the Jaguar. Tornado is close to, except for the variable wing. Notice both Jaguar and Tornados are also Rolls Royce powered and the similarity of the intake designs and locations in all three aircraft.
 

spc_ace

New Member
Registered Member
Re: JH-7/JH-7A Thread

Why is everyone quoting the 7 tons max load when the Chinese claims that JH-7A can now carry 9 tons? Puzzled??
 

tphuang

Lieutenant General
Staff member
Super Moderator
VIP Professional
Registered Member
Re: JH-7/JH-7A Thread

Why is everyone quoting the 7 tons max load when the Chinese claims that JH-7A can now carry 9 tons? Puzzled??
I never really thought it's max payload is limited 7 tonnes. I think if it had to, it could carry more. The real issue is that it's range would be limited in those cases.
 

Chengdu J-10

Junior Member
Re: JH-7/JH-7A Thread

you have to check the combat radius at different loads, speed and profile. Obviously, if you fly at mach0.85, you are going to be far more fuel efficient than mach 1.69. So, in the end, I don't believe Tornado has better range than JH-7 if both are carrying 4 Harpoon/YJ-83 sized AShM. Also, even though flankers are stated to have longer range/payload than JH-7, in actuality, they don't. A lot of the export specs are given at optimal conditions.
umm...i said that they had about the same range not that Tornado had better range then the JH-7A i never said that...JH-7A is not limited to 7 tonnes as many have stated but ive stated that it carries 6.5ish tonnes which it can deliver over a reasonable distance if the JH-7A were to carry its max payload its range will be substantially decreased...OK if we are getting to the technical aspect of the JH-7 appearance we could have pages of this so thats why i say that the JH-7 looks simular to the J-8 but not exact simular to reduce the length of the post. And how does turbofan and turbojet engines got to with the apperance between JH-7 and J-8 anyway...i know that engine size and etc...
 

crobato

Colonel
VIP Professional
Re: JH-7/JH-7A Thread

The only thing similar between the JH-7A and the J-8II is the generation look of the nose and the side intakes, but just about everything else I mentioned is so different that dramatic, or ends of the spectrum can well describe it.

For example, variable intakes vs. fixed intakes. The first one is more suitable for high altitude, supersonic flight, but the latter is more suited for subsonic acceleration, like in low altitudes. Same with the engines. Turbojets are more ideal for high altitude, supersonic flight but consume more fuel, while turbofans are more ideal for lower altitude subsonic flight and save more fuel.

In fact the differences are in line with the mission design. One is a high speed high altitude interceptor, while the other is a low altitude, subsonic, terrain level interdictor.
 

Chengdu J-10

Junior Member
Re: JH-7/JH-7A Thread

Yep correct one engine are more ideal for high altitude, supersonic flight but consume more fuel and thus giving a shorter range, while the other is more ideal for lower altitude subsonic flight and save more fuel with increase range perfect for low level pentration of enemy airdefence.
 

tphuang

Lieutenant General
Staff member
Super Moderator
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Registered Member
Re: JH-7/JH-7A Thread

This is kind of interesting, rumour time. A pretty prominent poster on Chinese bbs mentionned that only JH-7A is going for the exercise, because Russia did not allow J-11 and J-10 (or even mkk) to go.
 
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