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KC-135 Wingtip Refueling Pods  
User currently offlineDc8jet From United States of America, joined Feb 2004, 326 posts, RR: 0
Posted (8 years 7 months 2 weeks 3 days 8 hours ago) and read 6388 times:

I was wondering how many USAF KC-135s have been fitted with the wingtip refueling pods. I have slides of about 250 KC-135Rs and only one has the pods.

8 replies: All unread, jump to last
 
User currently offlineJwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 19
Reply 1, posted (8 years 7 months 2 weeks 3 days 6 hours ago) and read 6378 times:

AFAIK the pods aren't permanently attached but can be fitted as required.


I wish I were flying
User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12173 posts, RR: 51
Reply 2, posted (8 years 7 months 2 weeks 3 days 2 hours ago) and read 6358 times:

Quoting Jwenting (Reply 1):
AFAIK the pods aren't permanently attached but can be fitted as required.

That is correct.

I believe the USAF bought some 40-60 kits, for the KC-135s and 40 kits for the KC-10s. The -135 kits can be installed on most KC-135Rs. Fuel for these, I believe is pumped through the main fuel feed mainifold for the 4 main wing tanks, and not from the reserve tanks, just above the pods.

I assume, but don't know, the -10 kits get their fuel from a similar manifold.


User currently offlineRC135U From United States of America, joined May 2005, 293 posts, RR: 0
Reply 3, posted (8 years 7 months 2 weeks 3 days 1 hour ago) and read 6340 times:

Were there some fatigue issues with the pods, perhaps relating to the KC-10s?

User currently offlineRomeoKC10FE From United States of America, joined Jul 2004, 219 posts, RR: 0
Reply 4, posted (8 years 7 months 2 weeks 2 days 17 hours ago) and read 6284 times:

Quoting KC135TopBoom (Reply 2):
I assume, but don't know, the -10 kits get their fuel from a similar manifold

You are correct.

Quoting RC135U (Reply 3):
Were there some fatigue issues with the pods, perhaps relating to the KC-10s?

None that I know, it's actually a rare sight, most of the time we don't fly with them unless the Navy or Marines requests them and not all KC-10s are modified to carry them.


User currently offlineRC135U From United States of America, joined May 2005, 293 posts, RR: 0
Reply 5, posted (8 years 7 months 2 weeks 2 days 9 hours ago) and read 6213 times:

Quoting RomeoKC10FE (Reply 4):
None that I know, it's actually a rare sight, most of the time we don't fly with them unless the Navy or Marines requests them and not all KC-10s are modified to carry them.

I'm often in the area near McGuire AFB here in NJ and see the pods on the KC-10s from time to time. It sure seems to me that I'm seeing less of the -10s flying around and more and more of the C-17s.


User currently offlineKC135R From United States of America, joined Apr 2005, 728 posts, RR: 4
Reply 6, posted (8 years 7 months 6 days 17 hours ago) and read 6001 times:

Quoting Dc8jet (Thread starter):
I was wondering how many USAF KC-135s have been fitted with the wingtip refueling pods.

40 pods total, to fit on 20 modified airplanes (to date). No current plans for more, but rumors that AMC might want to modify more jets down the road. The number modified is not nearly what was discussed prior to the modification when (supposedly) half the fleet (or more) would be modified.

Quoting Jwenting (Reply 1):
AFAIK the pods aren't permanently attached but can be fitted as required.

Correct, the pod and the pylon it attaches to are removable. The 20 modified airplanes can fly with pod/pylon or without, just have to redo the aircraft weight and balance.

Quoting KC135TopBoom (Reply 2):
Fuel for these, I believe is pumped through the main fuel feed mainifold for the 4 main wing tanks, and not from the reserve tanks, just above the pods.

The SPR manifold that feeds the 4 main wing tanks and 2 reserve tanks has been modified to handle the additional flow from the A/R pumps and does, in fact, feed the pods. There were other fuel modifications to the plane, but that is the main one.


User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12173 posts, RR: 51
Reply 7, posted (8 years 7 months 6 days 8 hours ago) and read 5957 times:

Quoting KC135R (Reply 6):
The SPR manifold that feeds the 4 main wing tanks and 2 reserve tanks has been modified to handle the additional flow from the A/R pumps and does, in fact, feed the pods

So the fuel actually comes from the forward and aft body tanks, and not the mains, or centerwing tank? That does make more sense, since, if someone empties a main wing tank, it cannot be refilled, inflight.


User currently offlineKC135R From United States of America, joined Apr 2005, 728 posts, RR: 4
Reply 8, posted (8 years 7 months 5 days 21 hours ago) and read 5921 times:

Quoting KC135TopBoom (Reply 7):
So the fuel actually comes from the forward and aft body tanks, and not the mains, or centerwing tank?

Yes, the A/R pumps supply fuel from the body tanks to the (newly enlarged) SPR manifold to be used for MPRS refuels. Of course, just like before, nearly all the fuel from any tank can be gravity drained into the body tanks and used for a refuel.

The A/R manifold is now connected to the SPR manifold at all times, however an electrically controlled "wing isolation valve" has been added on each side of the airplane which can shut off fuel flow to the SPR manifold on either side independently.

Also, the manually operated #1 and #2 valves and the handle that operated them (the manual refuel handle) are all gone on MPRS jets.


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