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- ray ban11
- Legendarni građanin
- Pridružio: 17 Sep 2010
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Evo da imamo neke detalje sa proba verzije C-5 od AMRAAM ,ovo su sigurno pouzdani i za analizu validni podaci ( znaci poredjenje podataka iz tablice za efikasnu daljinu lansiranja R-27ER i ovi podaci sa probnih lansiranja AIM-120C-5)
Citat:
5.1 Scenario 1 - Estimated real world scenario
The missile is travelling at Mach 0.83 and 6km above sea level. It launches and accelerates forwards
for 1s before it begins a 15o
climb, levelling off at 13km ASL (Above Sea Level). It maintained this
ballistic trajectory before angling itself down to intercept at target point at 6km ASL with a missile
speed of Mach 0.9
Citat:Points about the first scenario
The missile at a 15o climb was unable to level off at 13km ASL in the simulation. Instead it
chose 14km ASL as the most energy efficient levelling altitude for this angle.
It required 21o
dive in order to make the intercept altitude and speed.
It made this intercept at a range of 60km. This is much further than the comparable 5000m
ASL straight line shot (~35km effective range).
sad ovo ..
Citat:5.2 Scenario 2 - Estimated maximum possible performance
Using what was learnt above, the next test examined the maximum possible range of the missile in
realistic scenarios at missile parameter limits. The missile was launched at 13km at Mach 1.5 and
began its climb to 22km. It maintains this altitude before descending at angle that causes an
intersection at 6km at Mach 0.9
Point about the second scenario
The ascent angle is still relatively low.
It demonstrates that the theoretical maximum realistic range of the missile on a stationary
point is approximately 90km.
iz dokumenta ( ukucati u gugl AIM-120C-5 Performance Brief i dobija se `pdf `)
Citat:AIM-120C-5 Performance Assessment for Digital Combat Simulation Enhancement
Revision 2
September 2014
Dakle C-5 kad se lansira sa visine 14 km ima neku efikasnu daljinu dejstva do 60km ( ovo sigurno ne vazi za slucaj gadjanja lovaca koji ostro i energicno manevrisu ) a 27ER sa 10km isto 60km ( bez obostranog manevrisanja takodje )... lansiranje na 5 km visine C-5 do 35 km efektivno a 27ER- 37km .
Kod C-5 je samo teorijski kineticki ( aerobalisticki ) dolet priblizno 90km ,kod E ( energetske )
Citat:Дальность баллистическая расчетная - 98 км (К-27Э, при пуске с высоты 20 км)
Poredjenje dimenzija , mase i brzine C-5 i 27ER
C-5
Duzina :3.65m,precnik:180mm ,raspon stabilizatora ( svih ): 482mm , masa :157kg ,brzina :4 M
ER
Duzina:4.78m,precnik:260mm,raspon stab.(prednjih ): 970mm ,(zadnjih ): 800mm,masa:350kg,brzina:4.5M
Razlike u precniku tela raketa su ocite,veoma bitno stabilizatori ( pokretni ) kod ER su dvostruko siri a te aerodinamicke upravljacke povrsine omogucavaju bolju pokretljivost i manevriblinost rakete na vecim napadnim uglovima i pri ostrijim manevrima ( okretima ) .Testovi kod C-5 pokazuju da ona sa povecanjem daljine i nap. ugla gubi pokretljivost.Masa je dvostruko veca ,brzina takodje veca .
E sad ono za sto najvise zapinjemo ,elektronika .
Citat:The latest fielded version, the AIM-120C7, incorporated an upgraded antenna, receiver, signal processor, and new software algorithms to counter new threats. The use of smaller system components created room for future growth.
• The AMRAAM program periodically develops and incorporates phased upgrades. The AMRAAM EPIP is a
software upgrade to AIM-120C3-C7.
• The AIM-120D is currently in development and the Air Force and Navy intend for it to deliver performance improvements beyond the AIM-120C7 using an internal GPS, enhanced datalink, improved kinematics, and new software.
http://www.dote.osd.mil/pub/reports/FY2014/pdf/af/2014amraam.pdf
Koje su zapravo stvarne prakticne mogucnosti RGS sa ARS kod AIM-120 ako se zna da telo rakete ima precnik svega 180mm ???
Evo sta pise za RGS tipa 9B-1101K kod ER
Citat:ТТХ ГСН 9-Б-1101К:
Длина с обтекателем - 1173 мм
Диаметр корпуса - 219 мм
Масса - 33,5 кг
Масса аппаратной части - 21,5 кг
Дальность захвата цели (ЭПР - 3 кв.м) - 25 км
Сектор захвата ГСН - 100 град.
Dakle samo prijemna ( ne predajno-prijemna/zraceca ) antena precnika nekih 200mm ( sira od tela rakete AIM-120 ) moze da primi odbijeni signal cilja RERP od 3m² sa 25 km ,dovoljno (odlicno ) za jednu raketu koja je operativna od sredine 80tih .Koliko se ovo vremenom sve poboljsalo i ovi parametri uvecali to ne znamo ,podatke nemamo a moguce da jesu kroz faze remonta/modernizacije .
Sta pise za novu verziju D ( nekada C-8 )
Citat:The AIM-120D (P3I Phase 4, formerly known as AIM-120C-8 ) is a development of the AIM-120C with a two-way data link, more accurate navigation using a GPS-enhanced IMU, an expanded no-escape envelope, improved HOBS (High-Angle Off-Boresight) capability, and a 50% increase in range.
http://www.designation-systems.net/dusrm/m-120.html
Neki uvodni evo podaci za novu ` D` ( pored operativnih C-5/6 i 7 ) ,ovo `dvosmerni data-link`, nista strasno ni posebno ,sve se moze ometati i `prigusiti`, GPS na raketama V-V ???  ,HOBS to bi trebalo naci da vidimo sta moze antenica od koliko 160-170mm ? kad je precnik tela 180 mm ...
I sad ovo 50 posto povecanje doleta( daljine gadjanja ) , e kako ? na osnovu cega ? produzenje i prosirenje tela rakete ? Neko novo raketno gorivo/komora motora ???
Pogledajmo komentar sa KP foruma
Citat:https://www.youtube.com/watch?v=WSuCLKRnt9Q Meteor missile test fire. It seems like it detonates when the fuel is up (no contrail the last bit). This means about 15-16 seconds of burn time, with an average speed of 1200m/s that means a powered flight range of a staggering 18-19,2 km!
http://www.youtube.com/watch?v=mXTDrLs2n_E And here we have the Aim120C7 (SLAMRAAM edition) with 8-9 seconds of powered flight. That means 9,6-10,8km of powered flight if airlaunched, with an average speed of 1200m/s.
Dalji komentari za `D` i maks .duzina putanje ( max range ) ne i neki efikasni .
Citat:But the original poster wanted to know the likely maximum range of the AIM-120D.
Arka_Voltchek suggested a range of “120km for the -D in good configuration. In this same configuration, the -A go to 60km”.
Sferrin wrote “I've read 180km useful flight range for an AIM-120D with a dual-pulse motor.”
However, the AIM-120D does not have a dual-pulse motor. This has been discussed in an earlier thread. It uses the same motor as the AIM-120C-5 and C-7, and the extended range is the result of improved energy management. In 2006, AIM-120D programme director had that the new missile achieves a "substantial" but undisclosed increase in range due to the use of new software algorithms combined with guidance data provided by the GPS/INU and a longer battery life.
Until some official pronouncement is made on AIM-120D range, I remain highly suspicious of all figures appearing on the internet.There is only one motor for the AIM-120D and it is the same one that has been installed in every AMRAAM since the C5 increase (due to electronics shrinkage).
http://www.atk.com/products-services...ulsion-system/
The only range improvements that have come since C5 have been due to better flight profiles. Increased accuracy of the IMU and the new GPS guidance package of the -120D is what accounts for its increase over the C7. And as displayed earlier. Kinematic performance of the launch platform, air density and maneuvering does make huge differences. Not to mention target direction. Against the same target, at the same altitude at the same subsonic speed (only different vector) the Aim120A/B;s effective range is in the 15-55km span (as seen in the chart).
http://forum.keypublishing.com/showthread.php?97983-AIM-120-range-questions
Rekoh za rakete V-V ove srednjeg i veceg dometa sto mi kazemo su veoma bitne te energetske sposobnosti ( pocetna i srednja brzina ,ubrzanje dakle ,trajnost rada rak. motora itd ) ,znaci akcenat je na energiji-kinetici a tu je 27ER za sve AMRAAM (mozda i za `D` ) nedostizna .
Ima i ovo
Citat:V(max) is a statement related to the speed of the launch platform. IE, if the Meteor has a maximum speed around mach 4 when launched in mach 0,8 or 0,9 it is likely that it will have a top speed around mach 5 when launched at mach 1,8-1,9. Thus V(max) is increased from m4 to m5 simply by the carriers speed. (just to make it clear what terms i use and how i use them)
za 27ER ( brzina 4.5M ,znaci brza i od Meteora) ) iz one tablice...
Citat:таблица дальностей пуска (без учета ограничений ГСН) ракет с Су-27. Условия все те же - скорость носителя 900 км/ч,
Maks. brzina lovca sa 27ET/ER je 1200-1300km/h .
Zakljucak :
Zrno/projektil od 7.62mm( racunajuci na barutno punjenje u cahuri ) nikako ne moze imati veci domet/dolet (duzinu putanje) od zrna 12.7mm ,balistika je tu neumoljiva .C-5/-7 je mase oko 160kg a 27ER ima u motoru dodatnih 100kg goriva uz dvostruko vecu ukupnu masu .
I za kraj .. u nekoj mogucoj realnoj DVB ( celo u celo ) dva visokomanevarska lovca prilikom obostranog lansiranja analiziranih raketa po lansiranju istih ce vrlo brzo doci do gubitka kontakta ( radio,radarskog i ovog data-link ) sa raketom zbog naglih/ostrih i energicnih ( 8, 9 ili vise `g` ) anti-raketnih manevara ( promena rakursa u kojem je moguce raketu korigovati po data- link ili radio- korekcijom ) .Raketa gubi cilj ( AMRAAM postaje samostalna tek po zahvatu cilja tj preuzimanju istog od radara lovca-nosaca ) i sta onda ??? Idemo opet ili ulazak u manevarsku BVB.
Ovo su kriticni uslovi i situacije koje su moguce i realne ( pogotovo sto u vazd. borbama se sve odvija veoma brzo uz velike vremensko-prostorne promene ) .. zato kazem T/ET ( vise detalja na 61 str ) ima veliku prednost nad obe analizirane rakete ( 27ER i C-5/6/7 i D ) .Jednostavno njen napad u PPS /ZPS moze biti potpuno neotkriven ( sve se odvija u pasivnom rezimu ) tako da pilot gadjanog aviona pa i lovca ne bi ni znao sta ga je snaslo .Ne pomaze ni `SPO` ni razni novi aktivni kontejnerski ometaci ( realno sem u slucaju moguceg ometanja radio-blizinskog ometaca ako se uopste i otkrije napad tj njen dolazak ) .
Zato R-27 uopste nije prastara raketa kad su njene performanse/sposobnosti u pitanju a u kontekstu poredjenja cak i sa najnovijim verzijama AIM-120.
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