dred wrote:
What is it about the tanking mission that would require the latest, most up-to-date technology? Has something changed about the mission?
There has been a significant move in the last 10 years to make tankers part of the data collection/dissemination constellation -- essentially having them onload pallets with specialized gear...since they are just sitting there orbiting near combat zones, there's no reason why they can't be doing SIGINT and the like while they're there.
dred wrote:
Regarding cargo capacity, how much cargo are our present tankers carrying? Even for an A-330, don't you have to trade-off fuel to carry more cargo? And if so, how does trading off fuel help the tanking mission?
At present, the KC-10 is the only aircraft that does both cargo and refueling. The KC-135 can't (doesn't) do both at the same time. It makes a big difference when you're trying to drag fighters from someplace a long ways away if you can also onload cargo on board and have it there at the same place and the same time.
dred wrote:
Regarding fuel transfer, what qualities does the A-330 possess that allow it to do this job better than a 767? Obviously, it should be capable of carrying more fuel, but I've never come across any information that the much smaller KC135's were inadequate.
135s are very tight on how much fuel they can pass. In Afghanistan, they're showing up in the tanker track with enough gas to suppport...well, not that many formations worth of fighters that are on station for 4 or 5 hours at a time. I don't want to get into details about how much gas is being passed and when, but let's just say that when tankers have to fly a couple of hours just to GET to the tanker track, it helps when they have quite a bit of gas to pass (e.g. loiter time). More gas on board is better.
This is exactly the point I was making earlier. There are many factors involved in picking the winner. None of us knows what those factors were.
I can tell you from a reciever's point of view, the KC-135 is a total piece of trash and the KC-10 is a dream. The wake turbulence produced by the 135 makes it very difficult to stay in position, and with the 135's boom essentially being "free floating", the boomer can't help put you where he wants you. In addition, the lighting configuration externally makes it very tough to fly position on the wings at night weariing NVGs.