Sorry I got so delayed... I was doing some flight testing for Jwocky but got delayed by other things in life. I intend to be a tanker pilot for this flight if needed. However, real life may interfere with me being able to do the flight - it may not either. I hope to know soon.
What I had found (all the test data comes from starting course KDSM-PGSN direct, 270 knots IAS, goal altitude 32,000, calculated data is after climbout and leveling in most cases i.e. real constant climb to altitude and then calculate total remaining distance based on the fuel left after climbout.):
IL-76. Cockpit marginal at best and where's the damn compass? On 80% fuel tank made 1836 nmi to crash, 4251 nmi remains. Appears to require 2.36 full refuels at 100% load (3.31 at 80% load.) Did not confirm that with consumption calculation testing - which I'd hold with the way I do it to be as-if-not-more accurate than fly-to-crash testing. There are nice aspects to the -76 as well. I'd love to recenter a view to view out the nose windows.... But range as is doesn't seem to cut it.
The KC-10 version I have was a weird case. The version I have still flies on empty tanks at 170 Kts. (Found that out when next morning plane was well over 1,000 miles beyond PGSN.) As best as I can figure using consumption data and aborting early, it seems to have a 6,200 nmi range to fuel exhaustion, which puts it into just-marginal-safety-range in my book. (And I don't know that I was using most recent version, but rather the one that I like flying civilian courtesy of Skyboat I think.)
The 707/KC-135 Lake of Constance: Loading to near max fuel I had an initial problem climbing up over FL 240. Eventually I did persuade it up to FL320 at M.74. As best as I could make it max range seemed to be 5,371 nmi, 773 nmi short of PGSN. This was an extrapolated range - a bit past the Alaska coast I turned around and landed at KSEA. Another calculation (I think it was 2 hours in when I was still cruising at FL 240 seemed to give me 4,098 nmi range.) Seems short.
At the time I was looking I couldn't find the C-141, though I told Jwocky I'd test that one out.... IIRC FG Wiki says the plane is MIA / no link to a hangar with it. Can I get a link to it?
I'm happy to fly either a tanker if such will be necessary.... (And I don't mind flying the support routes, either...) But if it seems likely we have enough tankers flying then I'm more than happy to fly fighter escort to a tanker and try to suck fuel as necessary. Really not sure what fighter I'd fly yet, though I'd give strong initial consideration to the F-4 Phantom that Jwocky modified to accept "proper" refueling if it can make the flight envelope. (He modded it so I could do a leg.... then I couldn't do that leg.)
I think I'm off to see how I can maneuver that through the Grand Canyon. (Well, I'll finish browsing new forum topics first...

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Primarily props / twins and small business/personal jets. IRL home airport KBMI, FG homes KLAS / KXTA.
Favorites: Cessna 421 "Golden Eagle," Twin Otter, BAe-125. A plane isn't my plane until I've modded the cockpit to the way I like it.