Chinese Engine Development

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flateric

Junior Member
TyroneG said:
Looks like there 2 layers to me. The silver layer is the outer covering and I don't mean painting. Inner one could very well be AL31F.
The extra silver covering add-on pierce obviously used to reduce RCS and mask its IR sig and could be entirely a separate pierce than the engine itself.
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- Do you have a common knowledge of how jet nozzle mechanism looks like?
- Why silver paint should, for the God's sake, lower an RCS?
 
Quickie

Quickie

Colonel
flateric said:
Have you read something about high-temperature paints and coatings?
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Something that will allow you to paint on jet engine petals? No. (Show us some examples if you did.)

Anyway, I doubt these paints/coatings will allow the petals to move freely or smoothly, or even at all, after they're being applied with such paints/coatings.

So, no, I don't believe the petals, the usual type and NOT the heat resistance type I mentioned earlier, can be simply painted over.
 
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J

jobjed

Captain
flateric said:
- Do you have a common knowledge of how jet nozzle mechanism looks like?
- Why silver paint should, for the God's sake, lower an RCS?
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He clearly said SILVER PIECE not silver paint. Before you question someone's knowledge of jet nozzles, you should check back on your knowledge of English.
 
F

flateric

Junior Member
jobjed said:
He clearly said SILVER PIECE not silver paint. Before you question someone's knowledge of jet nozzles, you should check back on your knowledge of English.
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I thought he even said 'pierce', so no need to teach me English here, please.
And what is 'silver piece' - I'm becoming interested in it?
All I see at the moment are nozzle petals covered with silverish paint or coating, with an attempt to imitate serrated pattern at the intersection of nozzle fairing and movable petals, which [pattern] quite soon started to pill.
 
J

jobjed

Captain
flateric said:
for example, anyone can buy something like this
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Depends on which engine really. The GE F110 has an AB exhaust temperature of ~1000 C but the PW F100-PW-220 and PW-229 has an AB exhaust temperature of ~1700 C which would be way too much for the paint to handle. Does anyone know the AB exhaust temperature of the AL-31 and WS-10 family?
 
F

flateric

Junior Member
jobjed said:
Depends on which engine really. The GE F110 has an AB exhaust temperature of ~1000 C but the PW F100-PW-220 and PW-229 has an AB exhaust temperature of ~1700 C which would be way too much for the paint to handle. Does anyone know the AB exhaust temperature of the AL-31 and WS-10 family?
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Outer petals have substantially less T than internal ones due to cooling.
AL-31F has exhaust T*F 2000 К (~1700 C) too.
And don't forget - FlameProof is just an COTS product
 
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Quickie

Quickie

Colonel
No way anyone will use this sort of coating on the nozzle petals. The coatings will crack or become uneven after a while, because of a variety of reasons like vibration, petals movement, bad bonding between coating and petals, and will inevitably jammed the petals from closing or opening.
 
K

kroko

Senior Member
TyroneG said:
Why every single important prototype like J20, J15, J21 all used russian engines? No confidence on domestic ones?
And what happened to WS13? it died? It's been couple years since we last heard of it doing taxi run.
If WS10A production issue solved like they claimed then same methodologies and manufacturing technique, and material would be applied to WS13, then they should be solved also. Make me wonder.

I think there's serious holes in their program, too much inconsistency and back-n-forth issues.
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perhabs it has something to do with lack of power and/or confidence.

And it is not only WS-13 which we have no clue.

We havent heard anything from WS-15 in years.
 
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