Generalmente no suelo prestar mucha atención a las discusiones técnicas sobre el diseño del PAK-FA (o F-22). Casi todos estos "análisis" no se sostienen por ninguna parte. En cambio este forista ha investigado un oco y parece haber encontrado algo muy interesante.
First of all I'd like to apologise to everybody regarding my recent hypothesis about the stealth properties of the Magnesium Boride (MgB) fan blade based on it's superconducting structure. Having reviewed it- I now believe this to be a false supposition.
I went on a wild goose-chase after 'New Scientist' spouted on about "superconducting stealth skins" for aircraft and, in my exuberance, tried to 'fit the picture to the frame'.
Although there are some intimations that superconducting materials have stealth properties, these are likely to require cryogenic temperatures for EM attenuation as rightly pointed out by Winterstars & Erkokite. Evidence to suggest otherwise is scant and inconclusive (and can be ruled out for the harsh environments of the engine):
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Entrar Being a former subscriber to 'New Scientist', I should've been more wary of the outlandish claims they sometimes make- by their estimations we should all be driving inter-dimensional, time-travelling, flying cars by now.
Apologies to all once again.
Having said that, I do believe I've cracked it.
There are structures called multi-walled carbon nanotubes (MWNTs)/многостенные углеродные нанотрубки, that have excellent broadband EM absorption characteristics:
Details of nanostrucure (and nanocomposite) research for stealth applications by the Institute of Theoretical & Applied Magnetics, Russia:
Summary of FGUP 'Urals HII Composite Materials' research into nanocomposite structures for aircraft engine applications, based on C-SiC**:
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EntrarHere is a report (from 2002) on the synthesis of regular Magnesium Boride (MgB) structure to MgB MWNT:
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Entrar So by all accounts this fan-blade is a Magnesium Boride MWNT carbon fibre composite structure.
*'NPP Motor's' R&D for the MgB fan blade was from 2006-12, they are contractors for the PAK-FA Stage 2 engine;
**MMPP Salyut have conducted extensive R&D of C-SiC composites' engine applications since at least 2006. Para ver el contenido hay que estar registrado.
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