J-20 5th Gen Fighter Thread VI

[Air Force Brat]

Possible i don't have see all posts... but I see WS-10A to 132 kns the B to 135 good ? very small difference but with TVC it is true ?

NO OVT KOMRAD! too much rewrite of the FCS, and with Canards the FCS is a jungle, trust me, laws and secondary laws, and flight regime changes.. all it really needs is more dry thrust, likely will gain a little more in "re-heat", but NO! OVT is NOT part of the equation!

 

[FORBIN]

NO OVT KOMRAD! too much rewrite of the FCS, and with Canards the FCS is a jungle, trust me, laws and secondary laws, and flight regime changes.. all it really needs is more dry thrust, likely will gain a little more in "re-heat", but NO! OVT is NOT part of the equation!

On Wiki different infos for almost each language version !

 

[Air Force Brat]

Any fancy maneuvers on the maiden flight?

NEVER, EVER on a first flight, it was short, just a simple mission profile, up around the patch,,, accelerate to about Mach .7 or so,,, normal control input, cycle the flaps slowly, maybe gear up, maybe NOT???

No doubt the F-22 popped a lot of first on its first flights, but test flying is done in baby steps, unless your airframe is just an upgrade..but the F-22 was quite a step up from the F-15, the J-20 is no doubt a leap over the J-11B, J-15s?? so very little drama here

If indeed the Chinese are running the WS-10,, we will see lots of powerplant testing, lots and lots, and easy peasy on anything else until that is well along!

Now if indeed the WS-10 is capable of 135 KN, then I expect she will be supercruising in due time.

 

[jobjed]

NEVER, EVER on a first flight, it was short, just a simple mission profile, up around the patch,,, accelerate to about Mach .7 or so,,, normal control input, cycle the flaps slowly, maybe gear up, maybe NOT???

First flights usually involve leaving the landing gear out. I'm not sure flying at Mach 0.7 (~800km/h) is wise given the stresses it would impart on the exposed landing gears and their bay doors.

 

[Figaro]

It seems PLAAF WS-10A is max 123 kN while PLAN WS-10H around 125 kN. The improved WS-10B is around 130 kN.

Other possible variants are at 134 kN (WS-10C?) and at 137 kN (WS-10X?)

I thought Pupu said the current engine is a WS-10B with a thrust of slightly under 14 tonnes? I'm a little confused by all these designations ...

 

[Air Force Brat]

First flights usually involve leaving the landing gear out. I'm not sure flying at Mach 0.7 (~800km/h) is wise given the stresses it would impart on the exposed landing gears and their bay doors.

and it really does depend on the aircraft and the mission objectives, but leaving the gear up or down is determined beforehand, but I'd actually say gear up or down is about a 50/50 mix...

With a typical Fighter aircraft the gear usually comes up before and after 250 knts or so??? so they will not overstress the aircraft,,, if the mission calls for airspeeds greater than 250 knts, then the gear will come up, and with some fighters, 250 kts could be a little to close to stall speed, particularly if some maneuvering is called for??

 

[jobjed]

and it really does depend on the aircraft and the mission objectives, but leaving the gear up or down is determined beforehand, but I'd actually say gear up or down is about a 50/50 mix...

With a typical Fighter aircraft the gear usually comes up before and after 250 knts or so??? so they will not overstress the aircraft,,, if the mission calls for airspeeds greater than 250 knts, then the gear will come up, and with some fighters, 250 kts could be a little to close to stall speed, particularly if some maneuvering is called for??

Both the J-20 and FC-31 conducted their first few flights with landing gear down. However, this J-20B? isn't a completely new aircraft so it's a toss-up as to whether it retracted its gears.

 

[Blitzo]

I thought Pupu said the current engine is a WS-10B with a thrust of slightly under 14 tonnes? I'm a little confused by all these designations ...

The user vincentmxq was asking if it reached 14 tons.

pupu replied "not that high"


Feel free to ask people to translate passages if you do not understand it.

 

[Figaro]

The user vincentmxq was asking if it reached 14 tons.

pupu replied "not that high"


Feel free to ask people to translate passages if you do not understand it.

@Qing asks Pupu if the WS-10B has 14.5 tonnes of thrust.
Pupu replies "not that high".
@vincentmxq asks Pupu if the WS-10B has 14 tonnes of thrust.
Pupu says the current WS-10B thrust is slightly less than than the 14t figure.

This was the interpretation by other Chinese members so I'm pretty sure Pupu meant the WS-10B has a thrust of slightly less than 14t as suggested by that Vincent user. If I'm mistaken, correct me by all means.

 

[Blitzo]

@Qing asks Pupu if the WS-10B has 14.5 tonnes of thrust.
Pupu replies "not that high".
@vincentmxq asks Pupu if the WS-10B has 14 tonnes of thrust.
Pupu says the current WS-10B thrust is slightly less than than the 14t figure.

This was the interpretation by other Chinese members so I'm pretty sure Pupu meant the WS-10B has a thrust of slightly less than 14t as suggested by that Vincent user.

Actually I'm not sure what direction that thread is meant to be read in.

But either way, it is lower than 14 tons of thrust. How much lower, whether it is "just a little bit" lower or "not that high" still doesn't give us a different appreciation of just how much different the two hypothetical numbers could be.