J-20 5th Generation Fighter VII

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siegecrossbow

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new image that huitong has labelled as WS-15 on his J-20 entry

6bGIwTa.jpg

I thought WS-15 is supposed to feature thrust vectoring nozzle? Can't really tell from this image.
 

Air Force Brat

Brigadier
Super Moderator
I thought WS-15 is supposed to feature thrust vectoring nozzle? Can't really tell from this image.

There's been lots of talk of that Siege, but from a practical stand point, would your roll in a new engine, and complicate that with OVT and the necessary changes to the FCS that would be an absolute requirement??

I mean the J-10C, with OVT that flew at Zhuhai, shows that may not be as large a stretch as I would have previously imagined, but the J-20 flight dynamics are much more complex with its distant coupled canards. It is no doubt a precursor to a J-20 that would be so equipped, but still, it seems like a lot of trouble for a small gain in post stall nose pointing and the acceleration of pitch rate that benefits the Flanker family, but the J-20 no doubt already has a mind numbing pitch rate.

I just don't know if I would complicate the J-20 additionally, for what might be only marginal performance improvements, at the cost of additional weight and complexity, as well as the loss of thrust from the WS-15??
 

vincent

Grumpy Old Man
Staff member
Moderator - World Affairs
There's been lots of talk of that Siege, but from a practical stand point, would your roll in a new engine, and complicate that with OVT and the necessary changes to the FCS that would be an absolute requirement??

I mean the J-10C, with OVT that flew at Zhuhai, shows that may not be as large a stretch as I would have previously imagined, but the J-20 flight dynamics are much more complex with its distant coupled canards. It is no doubt a precursor to a J-20 that would be so equipped, but still, it seems like a lot of trouble for a small gain in post stall nose pointing and the acceleration of pitch rate that benefits the Flanker family, but the J-20 no doubt already has a mind numbing pitch rate.

I just don't know if I would complicate the J-20 additionally, for what might be only marginal performance improvements, at the cost of additional weight and complexity, as well as the loss of thrust from the WS-15??

I thought someone said with thrust-vector engines, J20 doesn't have to move its canards as much during flight, minimizing radar reflections
 

siegecrossbow

General
Staff member
Super Moderator
There's been lots of talk of that Siege, but from a practical stand point, would your roll in a new engine, and complicate that with OVT and the necessary changes to the FCS that would be an absolute requirement??

I mean the J-10C, with OVT that flew at Zhuhai, shows that may not be as large a stretch as I would have previously imagined, but the J-20 flight dynamics are much more complex with its distant coupled canards. It is no doubt a precursor to a J-20 that would be so equipped, but still, it seems like a lot of trouble for a small gain in post stall nose pointing and the acceleration of pitch rate that benefits the Flanker family, but the J-20 no doubt already has a mind numbing pitch rate.

I just don't know if I would complicate the J-20 additionally, for what might be only marginal performance improvements, at the cost of additional weight and complexity, as well as the loss of thrust from the WS-15??

At a minimum it would have jagged nozzles for it reduction.
 

Tsin Phan

New Member
Registered Member
Hi, and welcome on board, but I must correct a few things:

1. so far there is no proof that China shared "its J-20 technologies with Pakistan for joint production (China Pakistan) jet fighter JF 17 Thunder Block3" ... there are surely certain avionics, structural and design elements borrowed, but I won't rate that a "share in J-20 technology"!

2. even if - esp. at the PDF - some are already jumping the bandwagon, the Block would feature exactly the J-20's HUD, that is wrong ... it si similar but not the same.
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Deino, I agree with your worthy opinions.
 

Air Force Brat

Brigadier
Super Moderator
At a minimum it would have jagged nozzles for it reduction.

No doubt it will have serrated nozzles to reduce L/O signature, I'm rather certain that Chengdu has produced a very stealthy aircraft Siege. My thinking is that OVT is very expensive, its relatively heavy as opposed to serrated nozzles alone, and very maintence intensive. In addition there is a significant loss of thrust attributed to the OVT, I can't quantify that?? so?? in any regard, the increased thrust of the WS-15 will increase climb and increase pitch authority in all flight regimes, unless you've pulled the throttles back for decent..

I like OVT, I'm a big fan, and the Flanker and the Raptor will make a believer out of you.

I thought someone said with thrust-vector engines, J20 doesn't have to move its canards as much during flight, minimizing radar reflections

While that is very true Vincent, in all honesty once you are above 400 knots, those canards are very effective, you just apply light pressure fore or aft to pitch up or down rapidly, they are very effective with very slight almost unnoticeable deflection, its not until you start heavy maneuvering that the canards would significantly spike your radar return...

my more practical argument against OVT on the WS-15's installed on the J-20 is that China has until very recently seemed not to interested in OVT until they purchased those SU-35's???, I will confess I was very pleasantly surprised, and more than a littel shocked when the J-10C flew at Zhuhai, I must say I was blown away, so it could happen?? I'm just doubtful that it will??? we shall see I suppose, it will be amazing when Chengdu flies the first J-20 with WS-15.... on that, I hope we can all agree!
 
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