Nemacki stelt programi

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Premazi su vazni, ali sa druge strane B-2 ima izolaciju (premaz, membrana) koja propusta (znaci sama po sebi ne absorbuje) radaske zrake koji onda u jednu "mrezu" u formi saca "zalutaju" odnosno nestanu.

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The Joker ::Premazi su vazni, ali sa druge strane B-2 ima izolaciju (premaz, membrana) koja propusta (znaci sama po sebi ne absorbuje) radaske zrake koji onda u jednu "mrezu" u formi saca "zalutaju" odnosno nestanu.

Cini mi se da je cak na SR-71 primenjeno nesto slicno (tkz. zamke za radio talase). Problem je sto one funkcionisu samo protiv odredjene talasne duzine.
Mislim da isto resenje ipak nisu primenili na B-2 ali posto sam laik za ovu tematiku mozda gresim.

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mean_machine ::stegonosa ::mean_machine ::Premazi kod F-117 itekako su bitni. Sam podatak mu kisa smeta dovoljno govori koliko F-117 savisi od premaza.

Vrlo moguce, ali ti premazi sigurno nisu ni izdaleka na istom tehnoloskom nivou kao danas. Sa druge strane, materijal od koga je napravljen mi ne deluje kao da voli kisu, bilo premaza ne bilo.

Mi ovde poredimo prve steltove. Da su Nemci zavrsili Svitca bilo bi to vrlo zanimljivo. Ja sam na netu procitao da je komisija USAF kojoj su Nemci predstavili svoj avion bila zapanjena (jer je slican sa F-117 koji je bio operativan ali strogo cuvana tajna) ali su izjavili da nisu zainteresovani i da smatraju takav koncept promasajem

Ja se secam da sam sam u jednom nemackom casopisu 90tih citao da su Amerikanci insistirali odnosno kod nemacke vlade isforsirali, da se MBB-ov LAMPIRIDAE (LAMPYRIDAE) projekt kratko posle toga ukine.

Oni su strahovali, da ce taj projekt da dospe ranije ili kasnije u javnost i u daljem dovesti do obelodanja njihovog aviona F-117.

Pored toga se u tom clanku tvrdilo, da je nemacki projekt davao daleko bolje rezultate u vezi radarske "nevidljivosti" nego amerikanski avion.

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mean_machine ::The Joker ::Premazi su vazni, ali sa druge strane B-2 ima izolaciju (premaz, membrana) koja propusta (znaci sama po sebi ne absorbuje) radaske zrake koji onda u jednu "mrezu" u formi saca "zalutaju" odnosno nestanu.

Cini mi se da je cak na SR-71 primenjeno nesto slicno (tkz. zamke za radio talase). Problem je sto one funkcionisu samo protiv odredjene talasne duzine.
Mislim da isto resenje ipak nisu primenili na B-2 ali posto sam laik za ovu tematiku mozda gresim.

malo sam guglovao:

Stelt tehnologija se basira na vise principa.
1 Silueta sa nakrivljenim povrsinama koje razbacaju radaske talase.
2 Skrivenim ili maksimalno hladjenim pogonom.
3 Zmaj od kompozita i
4 radio talasna absorbcija.

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Gledao sam pre nekoliko godina jednu emisiju o B-2 gde su spomenuli te zamke za radarske talase...

Trazio sam po net-u neke slike ali nazalost nista nisam nasao osim ovog teksta:

Auch das Innere der wulstigen Wände soll den Bomber gegen die Wellen des Radars verteidigen: mit einem Materialgemisch aus Kunststoff, Harzen und Graphit, dessen Struktur den Waben einer Honigscheibe ähnelt. Die Waben sollen die Fähigkeit besitzen, eindringende Radarstrahlen so lange hin- und her- und umzulenken, bis sie ihre Energie verloren haben. Elektromagnetische Wellen, die trotzdem reflektiert werden, sollen von der Außenhülle wieder in die dichtere Innenschicht gespiegelt und dort vollends absorbiert werden.


I unutrasnjost glomaznih zidova treba da stite bomber-a protiv radarskih talasa: sa jednom mesavinom od polymera, smole i grafita cija struktura lici na sace. Sace trebalo bi da ima sposobnost ulazujuce radarske talase toliko dugo da razbacaju tamo-ovamo dok se njihova energija ne istrosi. Elektromagnetski talasi koji se ipak reflektuju opet se odbace od unutrasnjih zidova u zbijeniju unutrasnju sihtu gde se potpuno absorbuju.


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P. S. I ja sam laik ali zato i postoji ovaj forum...pozivam inace nase strucnjake ukoliko imaju nesto zanimljivo da kazu uvezi ove teme da to ucine ili ukoliko mi gresimo da nas isprave. Inace sorry za prevod nije bas u duhu srpskoga jezika ali nadam se da je razumljiv...

Dopuna: 23 Jun 2009 12:21


Dannyboy ::
Ja se secam da sam sam u jednom nemackom casopisu 90tih citao da su Amerikanci insistirali odnosno kod nemacke vlade isforsirali, da se MBB-ov LAMPIRIDAE (LAMPYRIDAE) projekt kratko posle toga ukine.

Oni su strahovali, da ce taj projekt da dospe ranije ili kasnije u javnost i u daljem dovesti do obelodanja njihovog aviona F-117.

Pored toga se u tom clanku tvrdilo, da je nemacki projekt davao daleko bolje rezultate u vezi radarske "nevidljivosti" nego amerikanski avion.

The Joker ::"Lampyridae"

The RCS-measurement model was built at full scale (length 16 m, span 8 m) in 1987, and it confirmed the predictions made with the software program, showing a lower RCS than even the F-117.

The project ended in 1987 when MBB had proved it could design a stealthy aircraft. The research has since been used in other aircraft designs (presumably the Eurofighter Typhoon, EADS MAKO and various weapons). According to some people, the Americans were responsible for ending the project.

Evo ovo tvoje secanje tacno podtvrdjuje i ovaj sajt.

Dopuna: 25 Jun 2009 21:17

Vec je ovde na forumu predstavljen...ali eto da kompletiram topik:

EADS "Mako"


Dimensions: Wingspan 8.25m
Wing Area 26.7m²
Length 13.75m
Height 4.5m

Weights:
Empty Weight 5,800kg
Weapon Payload 4,500kg
Maximum Take-Off
Weight 13,000kg

Engines:
Type1 x GE F414M
Engine Rating98kN (22,000lb)
Fuel Weight, Single Seater 3,150kg
Fuel Weight, Two Seater 2,840kg

Performance:
Maximum Speed Mach 1.5
Maximum Altitude 14,400m
Airstrip Take-Off Run 450m
Airstrip Landing 750m
Ferry Range 3,700kmg-
Load Limits +9g to -3g


The Mako is an advanced trainer and light combat aircraft being developed at the EADS Military Aircraft facility based in Munchen, Germany. EADS was joined in November 1999 by the Air Force and Air Defence Force of the United Arab Emirates as a full partner in the programme. The definition phase of the aircraft development programme is complete. The UAE has withdrawn from the project. No decision on production of the aircraft has been taken and there has been no confirmation of a first flight scheduled for 2009.

The light combat variant is the primary variant of the Mako, available as a single-seat light combat aircraft for air defence and reconnaissance missions.

The trainer variant, with a stepped two-seat cockpit, is offered with and without the internal gun and multi-mode radar. In-flight weapon system simulators can be installed with a library of synthetic targets and threats.

At the Paris Air Show in June 2001, the following companies signed Memoranda of Understanding (MoU) with EADS and the UAE to support the Mako programme: Rockwell Collins for displays and controls, navigation, communication; Flight Visions for displays and controls; APPH Precision Hydraulics (UK) for landing gear and hydraulics systems; BAE Systems Controls (UK/USA) bidding for flight control computers, flight control system actuation and untility control system; BGT/Diehl (Germany) for flight control computers, mission computers and participation in weapon systems and countermeasures; Fairey Hydraulics Ltd (UK) for flight control system actuation; the SNECMA Group (France) offers M88-2 engine, landing gear (Messier-Dowty), gearbox (Hispano-Suiza), APU/starting systems (Microturbo).

The following companies had previously signed MoUs as potential suppliers: Computing Devices (UK) for mission control computer, displays and controls and stores control system; General Electric (USA) for the GE 414M engine; Honeywell (USA) for the environmental control system, external lighting, life-support system, navigation, hydraulics and secondary power system.

MAKO WEAPON SYSTEMS

The aircraft is equipped with seven hardpoints for external installation of weapons for anti-air and ground attack missions. There is a single hardpoint under the fuselage on the centreline, a single hardpoint for an air-to-air missile on each wingtip and two hardpoints under each wing. The aircraft can carry a maximum weapons load of 4,500kg.

Mako will be able to carry a variety of weapons: air-to-air missiles, for example, AIM-9L Sidewinder, IRIS-I or ASRAAM, AMRAAM, FMRAAM, Mica; air-to-ground missiles such as Maverick; anti-ship and stand-off missiles such as Taurus; and Mk 82 bombs.
An optional Mauser BK 27mm internal gun can be installed.

RADAR

The aircraft is offered with optional and alternative radar systems, including the BAE Systems Bluehawk, Thales RD-400 or the AN/APG-67 multi-mode radar.

COCKPIT

The aircraft accommodates one or two pilots. The glass cockpit layout and the instrumentation closely resemble those of the Eurofighter Typhoon. Each cockpit is fitted with three multifunction displays.

The high-visibility, single-piece windscreen hinges forward for maintenance of the avionics systems. The canopy opens to the starboard side.

The electronic flight control system is derived from the EFCS developed for the X-31 demonstrator aircraft. The flight control system incorporates a quadruplex digital fly-by-wire system.

The modular configuration of the avionics and instrumentation allows future upgrade systems to be installed. A forward-looking infrared and helmet-mounted sight can be installed.

MAKO AIRFRAME

The fuselage is of aluminium construction, with mainly carbon fibre air intakes and tail unit. The tailplane is all-moving.

Stealth technology is incorporated into the design. Mako has a radar cross-section of only 1m² at a 44km range. The forward section of the aircraft is chinned to give a low signature. Similarly, the wing and fuselage surfaces are blended and the shaped (non-right-angled) air intakes give low radar cross-section.

TURBOFAN ENGINE

The aircraft will be powered by a single General Electric GE 414M turbofan engine, that provides 98kN (22,000lb) of thrust. The engine is a variant of that which powers the F/A-18E/F Super Hornet entering service with he US Navy. The Mako engine will have dual channel FADEC (Full Authority Digital Engine Control).

LANDING GEAR

The aircraft is fitted with retractable, single-wheeled tricycle landing gear similar in structure to that of the Saab Gripen.




















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