Forumu ilk ziyaretiniz ise, yukarıda bulunan FAQ linkine tıklayın. Mesaj göndermeden önce KAYIT
olmanız gerekebilir. Mesaj göndermeye başlamak için, aşağıdaki seçimden ziyaret etmek istediğiniz forumu seçin.
Main dataAriane 5 ECAHeightup to 52 mDiameterup to 5.4 mLiftoff mass*780 tonnesPayload mass**9.6 tonnes
* Double launch
** Into Geostationary Transfer Orbit (GTO
The latest version of the Ariane-5 launcher, Ariane 5 ECA, is designed to place payloads weighing up to 9.6 tonnes into geostationary transfer orbit. With its increased capacity Ariane 5 ECA can handle dual launches of very large satellites.
This new version of the Ariane 5 will help to maintain Europe’s competitiveness in the commercial space transport sector by offering customers the opportunity to launch a wider range of heavier satellites while reducing launcher production costs.
Ariane 5 ECA - New elements
Ariane 5 ECA is a higher capacity Ariane 5 Generic launcher. Although it has the same general architecture, a number of major changes have been made to the basic structure of the Ariane 5 Generic version to increase thrust and enable it to carry heavier payloads into orbit. Solid boosters (EAP)
The EAP boosters’ upper segment of the Ariane 5 ECA (also known as segment S1) carries 10% - approximately 2.5 tonnes - more propellant. This extra propellant gives the Ariane 5 ECA an additional 50 tonnes of thrust in the first 20 seconds following liftoff. This means that together the twin boosters deliver a thrust of 1300 tonnes at liftoff, nearly 10 times the level delivered by the new engine of the central stage.
The boosters are also equipped with a new nozzle that has fewer parts and is easier and cheaper to produce.
Vulcain 2 test firing Main stage (EPC and Vulcain 2 engine)
An improved version of the Vulcain engine has been developed and implemented on the Ariane 5 ECA version. The Vulcain cryogenic engine has been modified to increase its thrust by 20% up to 137 tonnes. This new version, called Vulcain 2, operates under slightly higher pressure with a mixture ratio that has 20% more liquid oxygen than the Vulcain 1. Because of this change in the mixture, a new oxygen turbopump has been developed.
In addition, the Vulcain 2 turbopumps to be re-injected into the main system, thus improving engine performance at high altitude. The Vulcain 2 engine is a *** contributor to the additional lift capability of the new Ariane 5 ECA version into geostationary transfer orbit.
To hold the extra liquid oxygen needed for the operation of the central core stage, the capacity of the liquid oxygen tank has been increased by 16 tonnes. This was achieved by re-locating the common tank bulkhead between the liquid oxygen tank and the liquid hydrogen tank of the Ariane 5 Generic EPC stage and reinforcing the structure elements.
The new fuel load capacity of the EPC is:
Liquid oxygen: 150 tonnes
Liquid hydrogen: 25 tonnes
The EPC stage operates for nearly 540 s. It performs also the roll control function during all its propulsion phase. At the extinction, at an altitude between 160 and 210 km depending on the mission’s trajectory, the EPC stage separates from the upper composite and re-enters the atmosphere above the Atlantic Ocean.
Nefesler tutuldu ve geri sayım başladı Türksat 3A Bu Gece Fırlatılıyor
Türksat 3A uydusu, 12 Haziran 2008 Perşembe günü Fransız Guyanası yerel saatiyle 18:30’da (Türkiye saati ile 13 Haziran 2008 Cuma günü 00:54) Güney Amerika’daki Kourou Uzay Merkezi’nden uzaya gönderilecektir.
Türksat 3A’nın uzaya gönderilmesi ile ilgili programı, Ulaştırma Bakanı Sn. Binali Yıldırım, Ankara’dan takip edeceklerdir.
Yeni uydumuzun fırlatılmasına ilişkin canlı yayını isteyen televizyon kanalları, Türksat A.Ş. üzerinden aşağıdaki frekans bilgilerini kullanarak alabileceklerdir.
Yorum