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AIM 120 AMRAAM

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L'articolo finirà sul sito. L'avevo già inviato molte settimane fa ma l'amministratore in questo periodo è impegnatissimo, mi ha così consigliato di postarlo intanto sul forum.

 

Così vi anticipo che, appena si libera, vedrete anche un nuovo articolo sull'ALQ-131 da disturbo radar e sui pod serie BOZ-100 in dotazione ai Tornado.

Letto tutto l'articolo ottimo e molto interessante un bel+ :adorazione:

Interessanti sicuramente anche i prossimi articoli sull'ALQ-131 e sulla serie BOZ-100....

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Le serie finali del missile AIM-120 (C7 e D) continuano a presentare problemi. La ditta produttrice dei motori, l’ATK, esegue controlli a campione e prove al banco dei propulsori a combustibile solido. Per ogni partita di 48 missili, vengono provati 7 pezzi. Se anche un singolo missile non funziona, l’intera partita viene scartata. Eppure, per qualche ignota ragione, alla quota di 11000 metri il lancio di un AIM-120 si risolve spesso in un fallimento, per la mancata accensione del motore. Attualmente vi sono ben 800 missili fermi in magazzino in attesa di ulteriori verifiche.

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Che io sappia per alcuni modelli di missili AA a corto raggio e guida IR è stato realizzato un programma, potremmo dire una "patch" molto avanzata, per renderli efficaci anche contro obiettivi terrestri, quali piccoli veicoli, camionette, oppure buche da riparo (captando il calore dei malcapitati che vi si sono riparati) , soprattutto in vista di future guerre asimmetriche dove è possibile imbattersi in molti di questi obiettivi.

Sarebbe interessante sapere se è allo studio un adattamento anche per le "vecchie" versioni di AMRAAM che sarebbero altrimenti destinate alla rottamazione,potrebbe essere una soluzione valida, data la cospicua carica esplosiva e l'altissima velocità

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segnalo il link ad un articolo sul programma AMRAAM: AMRAAM: Deploying & Developing America’s Medium-Range Air-Air Missile

 

ORD_AIM-120_AMRAAM_Cutaway_lg.jpg

DATA_US_AMRAAM_Budgets.gif

 

qui viene segnalato il "noto" problema (articolo dello scorso luglio) Rocket motor mystery continues to halt AMRAAM deliveries

 

Raytheon Missile Systems has not delivered an AIM-120 Advanced Medium-Range Air-to-Air Missile (AMRAAM) in nearly two years because of an unexplained flaw in the missile's solid rocket motor.

The motors, supplied by ATK, have suffered mass failures when subjected to routine cold temperature tests. The issue has surprised and baffled ATK and Raytheon because the formulation and materials used to produce the rocket propellant fill have not changed – and have been in production, without incident, for more than 30 years. However, by late 2009 reliability problems had emerged with the ATK motors and now Raytheon says it has a stock of around 800 missiles that cannot be delivered. The US Depertment of Defense (DoD) has suspended payments to Raytheon until the rocket issues are solved and Raytheon admits that a final, reliable solution has yet to be found.

ATK's motors are failing a specific 'cold soak' test where the rockets are frozen to -65 degrees F (-54 degrees C) and then fired to prove they remain functional after carriage at high altitudes. ATK supplies motors in batches of 48 and the US practice is to test nine random examples from each batch.

 

 

E la risposta:

Stopped deliveries. IHS Jane’s reports that Raytheon has been unable to deliver any AIM-120 missiles for almost 2 years, because they keep failing cold firing tests designed to mimic temperatures at high altitudes. Raytheon and motor manufacturer ATK say that the materials and formulation haven’t changed in more than 30 years, but consistent test failures began in late 2009, and Raytheon reportedly has a stock of 800 undeliverable missiles.

Something, somewhere has changed, but what? Raytheon and ATK are highly motivated, as payments have been suspended until the problem is fixed. As of this date, they’re still looking for that fix. Raytheon’s official statement as of September 2012 is:

 

“Restoring AMRAAM to full production is a top priority for Raytheon, and has the full involvement of company leadership and our rocket motor suppliers. Raytheon has continued to produce AMRAAM guidance and control sections on schedule, while we wait for our primary supplier to deliver compliant rocket motors. All resources of Raytheon and our supplier, as well as government and other experts have been engaged to resolve the rocket motor manufacturing issues. We have developed a second rocket motor supplier that has begun to deliver. Raytheon recently delivered 132 AMRAAM all-up rounds to the U.S. Air Force. We continue to work closely with our rocket motor suppliers and our customer; we expect to be on track making additional significant missile deliveries to our customers before the end of the year.”

 

Nel settembre Raytheon ha ricevuto un nuovo finanziamento per la fornitura norvegese

NASAMS USA. Raytheon IDS in Tewksbury, MA receives a $9.65 million cost-plus-incentive-fee contract for maintenance and sustainment services in support of the Norwegian Advanced Surface to Air Missile System. There is a NASAMS system guarding the USA’s National Capital region.

Work will be performed in Redstone Arsenal, AL, with an estimated completion date of Aug 30/13. One bid was solicited, with 1 bid received by US Army Contracting Command in Redstone Arsenal, AL (W31P4Q-12-C-0276).

 

e, recente, un ulteriore finanziamento

Raytheon in Tucson, AZ is being awarded a $6.4 million cost-plus fixed-fee contract to provide AMRAAM flight support.

Work will be performed in Tucson, AZ, and will run to the end of the fiscal year on Sept 30/13. The AFLCMC/EBAD at Eglin AFB, FL manages the contract (FA8675-13-C-0052)

 

At present, consistent problems with cold testing and AMRAAM rocket motors seem to have halted AMRAAM deliveries, and created almost a 2-year inventory backlog. Raytheon and ATK are puzzled, because the formulation for AMRAAM’s rocket propellant hasn’t changed, and neither has the rocket motor’s design. While they try to figure that out, Raytheon has found a 2nd rocket motor supplier, and is slowly resuming deliveries to the USAF.
Edited by Andrea75

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Prossima fornitura alla Corea del Sud ....

 

US DSCA announces possible $452 million AMRAAM deal with Seoul ....

 

The US Defence Security Cooperation Agency (DSCA) has notified Congress of the possible sale of 260 Raytheon AIM-120C-7 AMRAAM air-to-air missiles for $452 million.

 

Fonte .... http://www.flightglobal.com/news/articles/us-dsca-announces-possible-452-million-amraam-deal-with-seoul-388519/

 

Il comunicato della DSCA .... http://www.dsca.osd.mil/PressReleases/36-b/2013/Korea_13-30.pdf

 

vmyy3a.jpg

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I missili AIM-120D attualmente in produzione impiegheranno il motore bistadio dell’AIM-120C7. Il progetto del previsto motore a doppio impulso è stato definitivamente accantonato. Nuovi algoritmi permetteranno una traiettoria il più possibile “lineare”, anticipando i movimenti del bersaglio. E’ prevista l’adozione di diversi componenti compositi nella fabbricazione del corpo del missile che consentiranno un aumento del 2 % nella quantità di combustibile.

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La notizia é appena apparsa sulla rivista Aranysas (una specie di RID ungherese), di solito bene informata. Aspetto una seconda fonte per la conferma.

 

Il raggio d'azione, finora indicato in 100 miglia nautiche in condizioni ideali (185 km) o nel 50 % superiore a quello dell'AIM-120C7, risulterebbe appena differente da quest'ultimo. Ma non é questo il problema maggiore. Il previsto motore a spinta variabile avrebbe dovuto "energizzare" la fase terminale dell'attacco, punto debole di ogni arma aria-aria.

 

Ora il missile difficilmente potrá competere con l'eccellente Meteor o con i missili simili in fase di sviluppo in Cina.

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Missili AIM-120 C-7 per i caccia norvegesi ...

The State Department has made a determination approving a possible Foreign Military Sale to Norway for AIM-120 C-7 Advanced Medium Range Air-to-Air Missiles (AMRAAM) for an estimated cost of $170 million.
The Defense Security Cooperation Agency delivered the required certification notifying Congress of this possible sale on November 14, 2017.

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AIM-260 ... un altro articolo ... apparso su thedrive.com/the-war-zone ...

... https://www.thedrive.com/the-war-zone/28636/meet-the-aim-260-the-air-force-and-navys-future-long-range-air-to-air-missile ...

E ce n'è pure uno su nationalinterest.org ...

... https://nationalinterest.org/blog/buzz/showdown-sky-why-air-force-developing-new-air-air-missile-63946 ...

... 

Edited by TT-1 Pinto
***

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Pintoooo, stiamo scrivendo in due discussioni diverse...

La discussione giusta in teoria dovrebbe essere quella sul nuovo missile, non su quello vecchio...ma andrebbe rinominata visto che ora siamo arrivati alla fine della collezione di sigle.

 

 

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