sancho
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Not the right thread but it's like this:i think there is bassic deferance in boath the deals. While as C-17 Globemaster III has significant advantages over IL 76, i could not find the case in A330 & IL 78 MRTT. Other than difference in range and some tech. advantages, i fail to find any thing which can provide a strategic advantage
In addition to the increased fuel load of the late model Il-76, the Il-78 has two, removable, 18,230 l fuel tanks installed in the freight hold, giving a transferable load of 85,720 kg (188,584 lb) with hold tanks and 57,720 kg (126,984 lb) without hold tanks...
...Soon after the Il-78 passed acceptance tests, in 1984, Ilyushin were instructed to design and produce an upgraded version to be known as Il-78M. The Il-78M is a dedicated tanker and cannot be converted back to the transport role easily. Adding a third freight hold tank increases the transferrable fuel to 105,720 kg
Ilyushin Il-78 - Wikipedia, the free encyclopedia
A pic of the removable fuel tanks:
So if you want to use the aircraft as a transport aircraft too, you will need a version with only 2 fuel tanks that can be removed, otherwise the only use will be refueling and as far as I know IAF has dedicated tanker versions with 3 fixed fuel tanks.
The A330 Multi Role Tanker Transport (MRTT) instead:
Thanks to its true wide-body fuselage with the optimised Airbus 222-inch cross-section, the A330 MRTT can also be used as a pure transport aircraft able to carry up to 380 passengers or a payload of up to 45 tonnes / 99 000 lb. It can also easily be converted to accommodate up to 130 stretchers for Medical Evacuation (MEDEVAC).
As no extra fuel tanks are needed the A330 MRTT maintains the extensive A330-200 payload capacity, with two lower deck cargo compartments (forward and aft) and a bulk area.
The versatility of the A330 MRTT enables a large number of cargo options to be transported. From standard commercial containers, such as the most used LD3, and pallets through military, ISO and NATO pallets and containers, to military vehicles. As an option the main deck can be configured for cargo transport with the installation of a large door to allowing large items of equipment to be carried.
EADS N.V. - A330 MRTT Multi Role Tanker Transport
Pic of A330:
A330 mrtt image by sandglasspatrol on Photobucket
That means, at the same time it acts as a refueller, it can carry a cargo of 45t, or troops!
When IAF attended Red Flag in the US, they send IL 78 tankers and another IL 76 for cargo only, see the difference?
Btw, the specs that you provided also shows, that A330 MRTT needs only a crew of 3, whereas the IL 78 needs a crew of 6.