J-20 5th Generation Fighter VII

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Totoro

Major
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They may be using engines as rudders. Especially during landing when speed is low and forces created by rudder are fairly low so they may benefit from extra control authority created by engine steering.
the landing is very demanding as yaw control must be precise so the plane can touch down perfectly straight on the runway if possible.
 

Intrepid

Major
They may be using engines as rudders. Especially during landing when speed is low and forces created by rudder are fairly low so they may benefit from extra control authority created by engine steering. The landing is very demanding as yaw control must be precise so the plane can touch down perfectly straight on the runway if possible.
Sounds like you've never steered an airplane and don't know the difference in response time between a control surface and a jet engine.
 

Hyperwarp

Captain
Funny ... I for myself think exactly the other way around: The left one looks like a typical "closed" AL-31, while the other one looks "wider" ... but again; I'm not sure. But after looking again and again I think you are correct.
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I am beginning to think that both are just AL-31F. Looks a lot like this one -

J-20_22.jpg
 

Deino

Lieutenant General
Staff member
Super Moderator
Registered Member
I cannot say whether they are AL-31F engines. But they are two identical engines.

View attachment 59133


I think from the nozzle alone it is not possible but given the fact the the J-10 uses a special custom-designed variant of the original AL-31F with the gear box relocated to the bottom as the AL-31FN for all J-10s, in mind that the RD-33 was modified to the RD-93 for both the JF-17 and FC-31 again with the gear box relocated to the bottom I cannot believe that CAC decided to use a regular AL-31F with the gear box again relocated on top.

As such I'm quite sure it is an AL-31FN of some sort.
 

Tirdent

Junior Member
Registered Member
Sounds like you've never steered an airplane and don't know the difference in response time between a control surface and a jet engine.

Not to mention there isn't that much yaw from asymmetric thrust in such closely spaced engines as this.

Most likely training engine-out landings (or, on the ground, using only one throttle to modulate taxi speed because residual thrust at idle is already a large fraction of the power required to keep the aircraft rolling).
 
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