Quoted for ignorance of the subject matter and an opportunity to (hopefully) educate the uneducated…

If anyone wishes to challenge these statements (points which have also been made in articles by Carlo Kopp), then feel free to present an argument with a “real” scientific basis (with calculations and supporting simulations) rather than the typical high-level blanket statements and guesses and blindly linking unrelated articles you don’t understand…

ActionJacksonMan, the following patent:

http://www.freepatent.ru/patents/2482149

…is from the very people doing this (I can deduce that from the accredited authors & company):

http://forum.keypublishing.com/showthread.php?126959-The-PAK-FA-News-Pics-amp-Debate-Thread-XXIV&p=2172452#post2172452

Frequency range 2-20GHz; thickness 1.5mm for -15dB (spray-on -19dB for 1.5mm). Now I concede the operating temperature is a tad on the low side, but given that it dates from 2011, I’m sure a thermal insulator in the PMC binder will factor as the patent is filed by the Type 30’s lead developer (current developments in excess of 300°C).

Anyways, before the first of the ‘second stage’ prototypes break cover and concentrating on the design of the current crop, what sort of values will be achievable for, say, 5mm (objectively speaking of course) and how would these results effect your T-50 ‘beam aspect’ diagram? Shall we call it (a very conservative) -25dB for 5mm?

If you could pay special attention to the paragraph containing the phrases “corner reflectors” and “intersection of two planes”, both these elements are visible on the pole model pic. Thanks.

Austin, for the Type 30: 3 -stage LPC; 5 -stage HPC (see pics) and single(?) staged turbine.
The LPC is an aluminium (CNT) martix composite, HPC is intermetallic TiAl (both these are BLISKed) and the turbine is a nickel-based superalloy.

[ATTACH=CONFIG]232916[/ATTACH][ATTACH=CONFIG]232917[/ATTACH]

Combined with a PMC shroud and stator vanes, you can see where they aim to save 30% weight and pull out an extra 2T thrust.

Well, given that it appears to have variable vanes which would mean it fits directly in front of the first stage fan (the T-50’s vanes are fixed and located downstream of the duct bend), then yes it appears destined for 4G fighter upgrades.

By the same notion the CNT-Al compressor is intended for retrofits, I guess it’s a serious attempt to address engine RCS issues if the RuAF is to continue purchasing & operating 4G+++++++++++++++++++++++++ fighters for the foreseeable future.

I’m really not sure that CNT will guarantee a stealthy compressor. Reduce its signature? Definitely. But making it stealthy and on par with S-shaped inlets or blockers seem rather unlikely, since the material has to withstand high temperature and loads from rotation. Not only that, I’m not sure if materials can fully substitute shaping in the near future, since blade geometry design for good engine performance may not be optimized for low radar return.

It is an integrated solution*. You can do the research for temperature, Young’s modulus, creep, damping etc.etc. CNT-Al nanocomposite covers all bases for the military LP compressor, comfortably outperforming Ti- this would not be the case if it was a conventional alloy. Not only is one of the co-developers a major player in CNT research, but ROSNANO itself is a major partner with UMPO for upcoming nanocomposite utilisation in military aircraft engines:

http://www.umpo.ru/News118_756.aspx

ROSNANO are the partners and the sponsors of the ‘Sygma’ video above.

Thus far CNT-Al has been the missing link. Combined with ‘Asakurius Duckius’ ®, it is nothing short of a 6G solution.

* http://forum.keypublishing.com/showthread.php?126959-The-PAK-FA-News-Pics-amp-Debate-Thread-XXIV&p=2125742#post2125742

…Doh!!! Missed the elephant in the room! The ‘keytometals’ link above refutes the description of these aluminium alloys as “high temperature”.

In particular, they do not meet the requirements at relatively high temperatures (up to, for example, 250°C.)

-which “severely limit their industrial applications”. However, the UMPO link describes theirs as “a heat-resistant aluminium alloy” (жаропрочного алюминиевого сплава).

This is a huge indicator that it is the application of CNT additives with their very high thermal conductivity that significantly improve the thermal (as high as 400°C) and thermo-mechanical properties of this aluminium matrix composite (and not necessarily CNT additives to the base Al-Cu-Mg-Ag alloy).

After all, they were bold enough to go for gamma titanium-aluminide for the Type 30’s HP compressor and kept this intermetallic composite’s R&D phase tightly under wraps. Incidentally, UMPO’s 2013 company audit (the one that broke ‘stage 2 PAK-FA prototypes’) also stated the Type 30’s LP compressor fan blades were still at the R&D stage.

Ah what the hell, let’s give ’em the benefit of the doubt (moving pictures speak louder than words):

http://youtu.be/GuiE1C7eZcE
http://www.sygma.ru/metals

So, Ladies and Gentlemen, (imho) with a high degree of certainty we can call this the [making of] the World’s first ‘Stealth Compressor’.