Re: China's indigenous jet engines, including for J-20, perform within reasonable nor
The engine has two layer of pedals. The internal ones seals the nozzle, controls the size of the airflow. It is a critical component of the engine.
The external ones are for aerodynamics purpose only. It hides the control elements for the internal pedals. We often see F-15 photos with the external pedals removed.
So it is quite easy and safe to create your own external pedals. It won't change the engine performance.
I really wish the J-20 flew with Chinese engines. However, let me repeat - the black and silver nozzles are the same engine (same length, same diameter). The color and shape of the external pedals don't mean a thing.
Between AL-31F and WS-10, I would have to say they are AL-31F due to the pedal count.
However, we cannot remove the slight possibility that they are a different variant of WS-10 - either a modified WS-10A, specifically for J-20, or WS-10G.
Wrong, WS-10 only one layer of blades for exterior, two layer of blades for interior. but AL-31F with two layer of blades for each exterior and interior, if they create one more layer of blades on AL-31F, people will easy to find out from the photos of J-20 engine nozzel.
if you mean create the exterior pedals means replace, AL-31F and F-15 engine are different, many people know that F-15 engine is speacial design for exterior layer remove, but Al-31 is not, and you need to tell us what reason China to do so, I had read some body said like you, but most of people doubt this opinion.
I see so many forums, so many people (include many engine expert) can not make the conclusion, I think you don't research very much about J-20 engine nozzle.
I have watched the photos for engine nozzle of AL-31f, WS-10a, J-20, I caunted how many blades they are, I times and times to watch the photos of engine nozzle of J-20, I would not make any conclusion.
time will tell, don't conclude so easy just by your guess.
there were many opinion for J-20 engine before it's maiden flight, until now, we only can say it's " unknow" engine.