In the early 80s, crews occasionally refueled from KC-10 "Extender" tankers. They were able to fly at higher airspeeds than the KC-135Qs, making refueling easier for SR-71 pilots. The high angle-of-attack (AOA) associated with a slow airspeed make the SR-71 more difficult to fly locked on to the boom of a KC-135Q. Based on the McDonnell Douglas DC-10 Series, the KC-10 can carry more than 356,000 pounds (160,200 kilograms) of fuel -- almost twice as much as the KC-135Q Stratotanker.
 
 

The KC-10's boom operator controls refueling operations through a digital fly-by-wire system. Sitting in the rear of the aircraft, the operator can see the receiver aircraft through a wide window. During boom refueling operations, fuel is transferred to the receiver at a maximum rate of 1,100 gallons per minute.

 
  Specifications

Primary Function: Aerial refueling

Prime Contractor: Douglas Aircraft Co., division of Boeing
Power Plant: Three General Electric CF6-50C2 turbofans
Length: 181 feet, 7 inches
Height: 58 feet, 1 inch
Wingspan:  165 feet, 4.5 inches
Speed: 619 mph
Ceiling:  42,000 feet
Date Deployed: March 1981
 
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